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Classical conditioning
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"Pavlov's dog" and "Pavlovian" redirect here. For the Pavlovian Upper Paleolithic culture, see Pavlovian culture. For other uses, see Pavlov's dog (disambiguation).
A statue of Ivan Pavlov and one of his dogs
Classical conditioning (also known as Pavlovian or respondent conditioning) refers to learning procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a bell). It also refers to the learning process that results from this pairing, through which the neutral stimulus comes to elicit a response (e.g. salivation) that is usually similar to the one elicited by the potent stimulus. These basic facts, which require many qualifications (see below), were first studied in detail by Ivan Pavlov through experiments with dogs. Together with operant conditioning, classical conditioning became the foundation of behaviorism, a school of psychology which was dominant in the mid-20th century and is still an important influence on the practice of psychological therapy and the study of animal behavior. Classical conditioning is a basic learning process, and its neural substrates are now beginning to be understood.
Contents
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1 Definition
2 Procedures
2.1 Pavlov's research
2.2 Terminology
2.3 Forward conditioning
2.4 Simultaneous conditioning
2.5 Second-order and higher-order conditioning
2.6 Backward conditioning
2.7 Temporal conditioning
2.8 Zero contingency procedure
2.9 Extinction
3 Phenomena observed
3.1 Acquisition
3.2 Extinction
3.3 External inhibition
3.4 Recovery from extinction
3.5 Stimulus generalization
3.6 Stimulus discrimination
3.7 Latent inhibition
3.8 Conditioned suppression
3.9 Conditioned inhibition
3.10 Blocking
4 Theories
4.1 Data sources
4.2 Stimulus-substitution theory
4.3 Rescorla–Wagner model
4.3.1 Equation
4.3.2 R–W model: acquisition
4.3.3 R–W model: extinction
4.3.4 R–W model: blocking
4.4 Theoretical issues and alternatives to the Rescorla–Wagner model
4.4.1 Content of learning
4.4.2 Role of attention in learning
4.4.3 Context
4.4.4 Comparator theory
4.4.5 Computational theory
4.4.6 Element-based models
4.4.6.1 The SOP model
5 Applications
5.1 Neural basis of learning and memory
5.2 Behavioral therapies
5.3 Conditioned drug response
5.4 Conditioned hunger
5.5 Conditioned emotional response
5.6 Pavlovian-instrumental transfer
6 In popular culture
7 See also
8 References
9 Further reading
10 External links
Definition[edit]
Classical conditioning occurs when a conditioned stimulus (CS) is paired with an unconditioned stimulus (US). Usually, the conditioned stimulus is a neutral stimulus (e.g., the sound of a tuning fork), the unconditioned stimulus is biologically potent (e.g., the taste of food) and the unconditioned response (UR) to the unconditioned stimulus is an unlearned reflex response (e.g., salivation). After pairing is repeated (some learning may occur after only one pairing), the organism exhibits a conditioned response (CR) to the conditioned stimulus when the conditioned stimulus is presented alone. The conditioned response is usually similar to the unconditioned response (see below), but unlike the unconditioned response, it must be acquired through experience and is relatively impermanent.[1]
In classical conditioning, the conditioned stimulus is not simply connected to the unconditioned response; the conditioned response usually differs in some way from the unconditioned response, sometimes significantly. For this and other reasons, learning theorists commonly suggest that the conditioned stimulus comes to signal or predict the unconditioned stimulus, and go on to analyze the consequences of this signal.[2] Robert A. Rescorla provided a clear summary of this change in thinking, and its implications, in his 1988 article "Pavlovian conditioning: It's not what you think it is".[3] Despite its widespread acceptance, Rescorla's thesis may not be defensible.[4]
Classical conditioning differs from operant or instrumental conditioning: in classical conditioning, behaviors are modified through the association of stimuli as described above, whereas in operant conditioning behaviors are modified by the effect they produce (i.e., reward or punishment).[5]
Procedures[edit]
Pavlov's research[edit]
The best-known and most thorough early work on classical conditioning was done by Ivan Pavlov, although Edwin Twitmyer published some related findings a year earlier.[6] During his research on the physiology of digestion in dogs, Pavlov developed a procedure that enabled him to study the digestive processes of animals over long periods of time. He redirected the animal's digestive fluids outside the body, where they could be measured. Pavlov noticed that his dogs began to salivate in the presence of the technician who normally fed them, rather than simply salivating in the presence of food. Pavlov called the dogs' anticipatory salivation "psychic secretion". Putting these informal observations to an experimental test, Pavlov presented a stimulus (e.g. the sound of a metronome) and then gave the dog food; after a few repetitions, the dogs started to salivate in response to the stimulus. Pavlov concluded that if a particular stimulus in the dog's surroundings was present when the dog was given food then that stimulus could become associated with food and cause salivation on its own.
Terminology[edit]
In Pavlov's experiments the unconditioned stimulus (US) was the dog food because its effects did not depend on previous experience. Next, the conditioned stimulus (CS) (or conditional stimulus) was the metronome's sound because its effects depend on its association with food.[7] Likewise, the responses of the dog follow the same conditioned-versus-unconditioned arrangement. The conditioned response (CR) is the response to the conditioned stimulus, whereas the unconditioned response (UR) corresponds to the unconditioned stimulus.
Pavlov reported many basic facts about conditioning; for example, he found that learning occurred most rapidly when the interval between the CS and the appearance of the US was relatively short.[8]
As noted earlier, it is often thought that the conditioned response is a replica of the unconditioned response, but Pavlov noted that saliva produced by the CS differs in composition from that produced by the US. In fact, the CR may be any new response to the previously neutral CS that can be clearly linked to experience with the conditional relationship of CS and US.[3][5] It was also thought that repeated pairings are necessary for conditioning to emerge, but many CRs can be learned with a single trial, especially in fear conditioning and taste aversion learning.
Diagram representing forward conditioning. The time interval increases from left to right.
Forward conditioning[edit]
Learning is fastest in forward conditioning. During forward conditioning, the onset of the CS precedes the onset of the US in order to signal that the US will follow.[9][10] Two common forms of forward conditioning are delay and trace conditioning.
Delay conditioning: In delay conditioning, the CS is presented and is overlapped by the presentation of the US. For example, if a person hears a buzzer for five seconds, during which time air is puffed into their eye, the person will blink. After several pairings of the buzzer and the puff, the person will blink at the sound of the buzzer alone. This is delay conditioning.
Trace conditioning: During trace conditioning, the CS and US do not overlap. Instead, the CS begins and ends before the US is presented. The stimulus-free period is called the trace interval or the conditioning interval. If in the above buzzer example, the puff came a second after the sound of the buzzer stopped, that would be trace conditioning, with a trace or conditioning interval of one second.
Simultaneous conditioning[edit]
Classical conditioning procedures and effects
During simultaneous conditioning, the CS and US are presented and terminated at the same time. For example: If a person hears a bell and has air puffed into their eye at the same time, and repeated pairings like this lead to the person blinking when they hear the bell despite the puff of air being absent, this demonstrates that simultaneous conditioning has occurred.
Second-order and higher-order conditioning[edit]
Main article: Second-order conditioning
Second-order or higher-order conditioning follow a two-step procedure. First a neutral stimulus ("CS1") comes to signal a US through forward conditioning. Then a second neutral stimulus ("CS2") is paired with the first (CS1) and comes to yield its own conditioned response.[11] For example: A bell might be paired with food until the bell elicits salivation. If a light is then paired with the bell, then the light may come to elicit salivation as well. The bell is the CS1 and the food is the US. The light becomes the CS2 once it is paired with the CS1.
Backward conditioning[edit]
Backward conditioning occurs when a CS immediately follows a US.[9] Unlike the usual conditioning procedure, in which the CS precedes the US, the conditioned response given to the CS tends to be inhibitory. This presumably happens because the CS serves as a signal that the US has ended, rather than as a signal that the US is about to appear.[12] For example, a puff of air directed at a person's eye could be followed by the sound of a buzzer.
Temporal conditioning[edit]
In temporal conditioning, a US is presented at regular intervals, for instance every 10 minutes. Conditioning is said to have occurred when the CR tends to occur shortly before each US. This suggests that animals have a biological clock that can serve as a CS. This method has also been used to study timing ability in animals (see Animal cognition).
Zero contingency procedure[edit]
In this procedure, the CS is paired with the US, but the US also occurs at other times. If this occurs, it is predicted that the US is likely to happen in the absence of the CS. In other words, the CS does not "predict" the US. In this case, conditioning fails and the CS does not come to elicit a CR.[13] This finding – that prediction rather than CS-US pairing is the key to conditioning – greatly influenced subsequent conditioning research and theory.
Extinction[edit]
Main article: Extinction (psychology)
In the extinction procedure, the CS is presented repeatedly in the absence of a US. This is done after a CS has been conditioned by one of the methods above. When this is done, the CR frequency eventually returns to pre-training levels. However, extinction does not completely eliminate the effects of the prior conditioning. This is demonstrated by spontaneous recovery – when there is a sudden appearance of the (CR) after extinction occurs – and other related phenomena (see "Recovery from extinction" below). These phenomena can be explained by postulating accumulation of inhibition when a weak stimulus is presented.
Phenomena observed[edit]
Acquisition[edit]
During acquisition, the CS and US are paired as described above. The extent of conditioning may be tracked by test trials. In these test trials, the CS is presented alone and the CR is measured. A single CS-US pairing may suffice to yield a CR on a test, but usually a number of pairings are necessary and there is a gradual increase in the conditioned response to the CS. This repeated number of trials increase the strength and/or frequency of the CR gradually. The speed of conditioning depends on a number of factors, such as the nature and strength of both the CS and the US, previous experience and the animal's motivational state.[2][5] The process slows down as it nears completion.[14]
Extinction[edit]
If the CS is presented without the US, and this process is repeated continuously, the CS will eventually stop eliciting a CR. This means that the CR has been "extinguished".[2] This occurs due to a temporal sensitive relationship between the US and CS. The cessation or long temporal delay of CS-US pairing results in a learned decision to stop responding to a CS since there is a sufficient change in the rate at which the CS is being reinforced.[15]

External inhibition[edit]
External inhibition may be observed if a strong or unfamiliar stimulus is presented just before, or at the same time as, the CS. This causes a reduction in the conditioned response to the CS.
Recovery from extinction[edit]
Several procedures lead to the recovery of a CR that had been first conditioned and then extinguished. This illustrates that the extinction procedure does not completely eliminate the effect of conditioning.[5] These procedures are the following:
Reacquisition: If the CS is again paired with the US, a CR is again acquired, but this second acquisition usually happens much faster than the first one.
Spontaneous recovery: Spontaneous recovery is defined as the reappearance of a previously extinguished conditioned response after a rest period. That is, if the CS is tested at a later time (for example an hour or a day) after extinction it will again elicit a CR. This renewed CR is usually much weaker than the CR observed prior to extinction.
Disinhibition: If the CS is tested just after extinction and an intense but associatively neutral stimulus has occurred, there may be a temporary recovery of the conditioned response to the CS.
Reinstatement: If the US used in conditioning is presented to a subject in the same place where conditioning and extinction occurred, but without the CS being present, the CS often elicits a response when it is tested later.
Renewal: Renewal is a reemergence of a conditioned response following extinction when an animal is returned to the environment in which the conditioned response was acquired.
Stimulus generalization[edit]
Stimulus generalization is said to occur if, after a particular CS has come to elicit a CR, another similar stimulus will elicit the same CR. Usually the more similar the CS and the test stimulus are, the stronger the CR to the test stimulus.[2] The more the test stimulus differs from the CS, the weaker the CR will be, or the more it will differ from that previously observed.
Stimulus discrimination[edit]
One observes stimulus discrimination when one stimulus ("CS1") elicits one CR and another stimulus ("CS2") elicits either another CR or no CR at all. This can be brought about by, for example, pairing CS1 with an effective US and presenting CS2 with no US.[2]
Latent inhibition[edit]
Main article: Latent inhibition
Latent inhibition refers to the observation that it takes longer for a familiar stimulus to become a CS than it does for a novel stimulus to become a CS, when the stimulus is subsequently paired with an effective US.[2]
Conditioned suppression[edit]
This is one of the most common ways to measure the strength of learning in classical conditioning. A typical example of this procedure is as follows: a rat first learns to press a lever through operant conditioning. Then, in a series of trials, the rat is exposed to a CS, a light or a noise, followed by the US, a mild electric shock. An association between the CS and US develops, and the rat slows or stops its lever pressing when the CS comes on. The rate of pressing during the CS measures the strength of classical conditioning; that is, the slower the rat presses, the stronger the association of the CS and the US. (Slow pressing indicates a "fear" conditioned response, and it is an example of a conditioned emotional response; see section below.)
Conditioned inhibition[edit]
Three phases of conditioning are typically used:
Phase 1
A CS (CS+) is paired with a US until asymptotic CR levels are reached.
Phase 2
CS+/US trials are continued, but these are interspersed with trials on which the CS+ is paired with a second CS, (the CS-) but not with the US (i.e. CS+/CS- trials). Typically, organisms show CRs on CS+/US trials, but stop responding on CS+/CS− trials.
Phase 3
Summation test for conditioned inhibition: The CS- from phase 2 is presented together with a new CS+ that was conditioned as in phase 1. Conditioned inhibition is found if the response is less to the CS+/CS- pair than it is to the CS+ alone.
Retardation test for conditioned inhibition: The CS- from phase 2 is paired with the US. If conditioned inhibition has occurred, the rate of acquisition to the previous CS− should be less than the rate of acquisition that would be found without the phase 2 treatment.
Blocking[edit]
Main article: Blocking effect
This form of classical conditioning involves two phases.
Phase 1
A CS (CS1) is paired with a US.
Phase 2
A compound CS (CS1+CS2) is paired with a US.
Test
A separate test for each CS (CS1 and CS2) is performed. The blocking effect is observed in a lack of conditional response to CS2, suggesting that the first phase of training blocked the acquisition of the second CS.
Theories[edit]
Data sources[edit]
Experiments on theoretical issues in conditioning have mostly been done on vertebrates, especially rats and pigeons. However, conditioning has also been studied in invertebrates, and very important data on the neural basis of conditioning has come from experiments on the sea slug, Aplysia.[16] Most relevant experiments have used the classical conditioning procedure, although instrumental (operant) conditioning experiments have also been used, and the strength of classical conditioning is often measured through its operant effects, as in conditioned suppression (see Phenomena section above) and autoshaping.
Stimulus-substitution theory[edit]
Further information: Counterconditioning
According to Pavlov, conditioning does not involve the acquisition of any new behavior, but rather the tendency to respond in old ways to new stimuli. Thus, he theorized that the CS merely substitutes for the US in evoking the reflex response. This explanation is called the stimulus-substitution theory of conditioning.[17] A critical problem with the stimulus-substitution theory is that the CR and UR are not always the same. Pavlov himself observed that a dog's saliva produced as a CR differed in composition from that produced as a UR.[6] The CR is sometimes even the opposite of the UR. For example: the unconditional response to electric shock is an increase in heart rate, whereas a CS that has been paired with the electric shock elicits a decrease in heart rate. (However, it has been proposed that only when the UR does not involve the central nervous system are the CR and the UR opposites.)
Rescorla–Wagner model[edit]
Main article: Rescorla–Wagner model
The Rescorla–Wagner (R–W) model[5][18] is a relatively simple yet powerful model of conditioning. The model predicts a number of important phenomena, but it also fails in important ways, thus leading to a number of modifications and alternative models. However, because much of the theoretical research on conditioning in the past 40 years has been instigated by this model or reactions to it, the R–W model deserves a brief description here.[19][20]
The Rescorla-Wagner model argues that there is a limit to the amount of conditioning that can occur in the pairing of two stimuli. One determinant of this limit is the nature of the US. For example: pairing a bell with a juicy steak is more likely to produce salivation than pairing the bell with a piece of dry bread, and dry bread is likely to work better than a piece of cardboard. A key idea behind the R–W model is that a CS signals or predicts the US. One might say that before conditioning, the subject is surprised by the US. However, after conditioning, the subject is no longer surprised, because the CS predicts the coming of the US. (Note that the model can be described mathematically and that words like predict, surprise, and expect are only used to help explain the model.) Here the workings of the model are illustrated with brief accounts of acquisition, extinction, and blocking. The model also predicts a number of other phenomena, see main article on the model.
Equation[edit]
Δ V = α β ( λ − Σ V ) {\displaystyle \Delta V=\alpha \beta (\lambda -\Sigma V)}
This is the Rescorla-Wagner equation. It specifies the amount of learning that will occur on a single pairing of a classical conditioning (CS) with an unconditioned stimulus (US). The above equation is solved repeatedly to predict the course of learning over many such trials.
In this model the degree of learning is measured by how well the CS predicts the US, which is given by the "associative strength" of the CS. In the equation, V represents the current associative strength of the CS, and ∆V is the change in this strength that happens on a given trial. ΣV is the sum of the strengths of all stimuli present in the situation. λ is the maximum associative strength that a given US will support; its value is usually set to 1 on trials when the US is present, and 0 when the US is absent. α and β are constants related to the salience of the CS and the speed of learning for a given US. How the equation predicts various experimental results is explained in following sections. For further details, see the main article on the model.[21]
R–W model: acquisition[edit]
The R–W model measures conditioning by assigning an "associative strength" to the CS and other local stimuli. Before a CS is conditioned it has an associative strength of zero. Pairing the CS and the US causes a gradual increase in the associative strength of the CS. This increase is determined by the nature of the US (e.g. its intensity).[22] The amount of learning that happens during any single CS-US pairing depends on the difference between the total associative strengths of CS and other stimuli present in the situation (ΣV in the equation), and a maximum set by the US (λ in the equation). On the first pairing of the CS and US, this difference is large and the associative strength of the CS takes a big step up. As CS-US pairings accumulate, the US becomes more predictable, and the increase in associative strength on each trial becomes smaller and smaller. Finally the difference between the associative strength of the CS (plus any that may accrue to other stimuli) and the maximum strength reaches zero. That is, the US is fully predicted, the associative strength of the CS stops growing, and conditioning is complete.
R–W model: extinction[edit]
The associative process described by the R–W model also accounts for extinction (see "procedures" above). The extinction procedure starts with a positive associative strength of the CS, which means that the CS predicts that the US will occur. On an extinction trial the US fails to occur after the CS. As a result of this “surprising” outcome, the associative strength of the CS takes a step down. Extinction is complete when the strength of the CS reaches zero; no US is predicted, and no US occurs. However, if that same CS is presented without the US but accompanied by a well-established conditioned inhibitor (CI), that is, a stimulus that predicts the absence of a US (in R-W terms, a stimulus with a negative associate strength) then R-W predicts that the CS will not undergo extinction (its V will not decrease in size).
R–W model: blocking[edit]
Main article: Blocking effect
The most important and novel contribution of the R–W model is its assumption that the conditioning of a CS depends not just on that CS alone, and its relationship to the US, but also on all other stimuli present in the conditioning situation. In particular, the model states that the US is predicted by the sum of the associative strengths of all stimuli present in the conditioning situation. Learning is controlled by the difference between this total associative strength and the strength supported by the US. When this sum of strengths reaches a maximum set by the US, conditioning ends as just described.[22]
The R–W explanation of the blocking phenomenon illustrates one consequence of the assumption just stated. In blocking (see "phenomena" above), CS1 is paired with a US until conditioning is complete. Then on additional conditioning trials a second stimulus (CS2) appears together with CS1, and both are followed by the US. Finally CS2 is tested and shown to produce no response because learning about CS2 was “blocked” by the initial learning about CS1. The R–W model explains this by saying that after the initial conditioning, CS1 fully predicts the US. Since there is no difference between what is predicted and what happens, no new learning happens on the additional trials with CS1+CS2, hence CS2 later yields no response.
Theoretical issues and alternatives to the Rescorla–Wagner model[edit]
One of the main reasons for the importance of the R–W model is that it is relatively simple and makes clear predictions. Tests of these predictions have led to a number of important new findings and a considerably increased understanding of conditioning. Some new information has supported the theory, but much has not, and it is generally agreed that the theory is, at best, too simple. However, no single model seems to account for all the phenomena that experiments have produced.[5][23] Following are brief summaries of some related theoretical issues.[19]
Content of learning[edit]
The R–W model reduces conditioning to the association of a CS and US, and measures this with a single number, the associative strength of the CS. A number of experimental findings indicate that more is learned than this. Among these are two phenomena described earlier in this article
Latent inhibition: If a subject is repeatedly exposed to the CS before conditioning starts, then conditioning takes longer. The R–W model cannot explain this because preexposure leaves the strength of the CS unchanged at zero.
Recovery of responding after extinction: It appears that something remains after extinction has reduced associative strength to zero because several procedures cause responding to reappear without further conditioning.[5]
Role of attention in learning[edit]
Latent inhibition might happen because a subject stops focusing on a CS that is seen frequently before it is paired with a US. In fact, changes in attention to the CS are at the heart of two prominent theories that try to cope with experimental results that give the R–W model difficulty. In one of these, proposed by Nicholas Mackintosh,[24] the speed of conditioning depends on the amount of attention devoted to the CS, and this amount of attention depends in turn on how well the CS predicts the US. Pearce and Hall proposed a related model based on a different attentional principle[25] Both models have been extensively tested, and neither explains all the experimental results. Consequently, various authors have attempted hybrid models that combine the two attentional processes. Pearce and Hall in 2010 integrated their attentional ideas and even suggested the possibility of incorporating the Rescorla-Wagner equation into an integrated model.[5]
Context[edit]
As stated earlier, a key idea in conditioning is that the CS signals or predicts the US (see "zero contingency procedure" above). However, for example, the room in which conditioning takes place also "predicts" that the US may occur. Still, the room predicts with much less certainty than does the experimental CS itself, because the room is also there between experimental trials, when the US is absent. The role of such context is illustrated by the fact that the dogs in Pavlov's experiment would sometimes start salivating as they approached the experimental apparatus, before they saw or heard any CS.[14] Such so-called "context" stimuli are always present, and their influence helps to account for some otherwise puzzling experimental findings. The associative strength of context stimuli can be entered into the Rescorla-Wagner equation, and they play an important role in the comparator and computational theories outlined below.[5]
Comparator theory[edit]
To find out what has been learned, we must somehow measure behavior ("performance") in a test situation. However, as students know all too well, performance in a test situation is not always a good measure of what has been learned. As for conditioning, there is evidence that subjects in a blocking experiment do learn something about the "blocked" CS, but fail to show this learning because of the way that they are usually tested.
"Comparator" theories of conditioning are "performance based", that is, they stress what is going on at the time of the test. In particular, they look at all the stimuli that are present during testing and at how the associations acquired by these stimuli may interact.[26][27] To oversimplify somewhat, comparator theories assume that during conditioning the subject acquires both CS-US and context-US associations. At the time of the test, these associations are compared, and a response to the CS occurs only if the CS-US association is stronger than the context-US association. After a CS and US are repeatedly paired in simple acquisition, the CS-US association is strong and the context-US association is relatively weak. This means that the CS elicits a strong CR. In “zero contingency” (see above), the conditioned response is weak or absent because the context-US association is about as strong as the CS-US association. Blocking and other more subtle phenomena can also be explained by comparator theories, though, again, they cannot explain everything.[5][19]
Computational theory[edit]
An organism's need to predict future events is central to modern theories of conditioning. Most theories use associations between stimuli to take care of these predictions. For example: In the R–W model, the associative strength of a CS tells us how strongly that CS predicts a US. A different approach to prediction is suggested by models such as that proposed by Gallistel & Gibbon (2000, 2002).[28][29] Here the response is not determined by associative strengths. Instead, the organism records the times of onset and offset of CSs and USs and uses these to calculate the probability that the US will follow the CS. A number of experiments have shown that humans and animals can learn to time events (see Animal cognition), and the Gallistel & Gibbon model yields very good quantitative fits to a variety of experimental data.[2][19] However, recent studies have suggested that duration-based models cannot account for some empirical findings as well as associative models.[30]
Element-based models[edit]
The Rescorla-Wagner model treats a stimulus as a single entity, and it represents the associative strength of a stimulus with one number, with no record of how that number was reached. As noted above, this makes it hard for the model to account for a number of experimental results. More flexibility is provided by assuming that a stimulus is internally represented by a collection of elements, each of which may change from one associative state to another. For example, the similarity of one stimulus to another may be represented by saying that the two stimuli share elements in common. These shared elements help to account for stimulus generalization and other phenomena that may depend upon generalization. Also, different elements within the same set may have different associations, and their activations and associations may change at different times and at different rates. This allows element-based models to handle some otherwise inexplicable results.
The SOP model[edit]
A prominent example of the element approach is the “SOP” model of Wagner.[31] The model has been elaborated in various ways since its introduction, and it can now account in principle for a very wide variety of experimental findings.[5] The model represents any given stimulus with a large collection of elements. The time of presentation of various stimuli, the state of their elements, and the interactions between the elements, all determine the course of associative processes and the behaviors observed during conditioning experiments.
The SOP account of simple conditioning exemplifies some essentials of the SOP model. To begin with, the model assumes that the CS and US are each represented by a large group of elements. Each of these stimulus elements can be in one of three states:
primary activity (A1) - Roughly speaking, the stimulus is “attended to.” (References to “attention” are intended only to aid understanding and are not part of the model.)
secondary activity (A2) - The stimulus is “peripherally attended to.”
inactive (I) – The stimulus is “not attended to.”
Of the elements that represent a single stimulus at a given moment, some may be in state A1, some in state A2, and some in state I.
When a stimulus first appears, some of its elements jump from inactivity I to primary activity A1. From the A1 state they gradually decay to A2, and finally back to I. Element activity can only change in this way; in particular, elements in A2 cannot go directly back to A1. If the elements of both the CS and the US are in the A1 state at the same time, an association is learned between the two stimuli. This means that if, at a later time, the CS is presented ahead of the US, and some CS elements enter A1, these elements will activate some US elements. However, US elements activated indirectly in this way only get boosted to the A2 state. (This can be thought of the CS arousing a memory of the US, which will not be as strong as the real thing.) With repeated CS-US trials, more and more elements are associated, and more and more US elements go to A2 when the CS comes on. This gradually leaves fewer and fewer US elements that can enter A1 when the US itself appears. In consequence, learning slows down and approaches a limit. One might say that the US is “fully predicted” or “not surprising” because almost all of its elements can only enter A2 when the CS comes on, leaving few to form new associations.
The model can explain the findings that are accounted for by the Rescorla-Wagner model and a number of additional findings as well. For example, unlike most other models, SOP takes time into account. The rise and decay of element activation enables the model to explain time-dependent effects such as the fact that conditioning is strongest when the CS comes just before the US, and that when the CS comes after the US (“backward conditioning”) the result is often an inhibitory CS. Many other more subtle phenomena are explained as well.[5]
A number of other powerful models have appeared in recent years which incorporate element representations. These often include the assumption that associations involve a network of connections between “nodes” that represent stimuli, responses, and perhaps one or more “hidden” layers of intermediate interconnections. Such models make contact with a current explosion of research on neural networks, artificial intelligence and machine learning.
Applications[edit]
Neural basis of learning and memory[edit]
Pavlov proposed that conditioning involved a connection between brain centers for conditioned and unconditioned stimuli. His physiological account of conditioning has been abandoned, but classical conditioning continues to be studied in attempts to understand the neural structures and functions that underlie learning and memory. Forms of classical conditioning that are used for this purpose include, among others, fear conditioning, eyeblink conditioning, and the foot contraction conditioning of Hermissenda crassicornis, a sea-slug.
"Available data demonstrate that discrete regions of the cerebellum and associated brainstem areas contain neurons that alter their activity during conditioning – these regions are critical for the acquisition and performance of this simple learning task. It appears that other regions of the brain, including the hippocampus, amygdala, and prefrontal cortex, contribute to the conditioning process, especially when the demands of the task get more complex."[32]
Behavioral therapies[edit]
Main article: Behavior therapy
Some therapies associated with classical conditioning are aversion therapy, systematic desensitization and flooding. Aversion therapy is a type of behavior therapy designed to make patients cease an undesirable habit by associating the habit with a strong unpleasant unconditioned stimulus.[33] For example, a medication might be used to associate the taste of alcohol with stomach upset. Systematic desensitization is a treatment for phobias in which the patient is trained to relax while being exposed to progressively more anxiety-provoking stimuli (e.g. angry words). This is an example of counterconditioning, intended to associate the feared stimuli with a response (relaxation) that is incompatible with anxiety[34] Flooding is a form of desensitization that attempts to eliminate phobias and anxieties by repeated exposure to highly distressing stimuli until the lack of reinforcement of the anxiety response causes its extinction.[35] "Flooding" usually involves actual exposure to the stimuli, whereas the term "implosion" refers to imagined exposure, but the two terms are sometimes used synonymously.
Conditioning therapies usually take less time than humanistic therapies.[36]
Conditioned drug response[edit]
A stimulus that is present when a drug is administered or consumed may eventually evoke a conditioned physiological response that mimics the effect of the drug. This is sometimes the case with caffeine; habitual coffee drinkers may find that the smell of coffee gives them a feeling of alertness. In other cases, the conditioned response is a compensatory reaction that tends to offset the effects of the drug. For example, if a drug causes the body to become less sensitive to pain, the compensatory conditioned reaction may be one that makes the user more sensitive to pain. This compensatory reaction may contribute to drug tolerance. If so, a drug user may increase the amount of drug consumed in order to feel its effects, and end up taking very large amounts of the drug. In this case a dangerous overdose reaction may occur if the CS happens to be absent, so that the conditioned compensatory effect fails to occur. For example, if the drug has always been administered in the same room, the stimuli provided by that room may produce a conditioned compensatory effect; then an overdose reaction may happen if the drug is administered in a different location where the conditioned stimuli are absent.[37]
Conditioned hunger[edit]
Signals that consistently precede food intake can become conditioned stimuli for a set of bodily responses that prepares the body for food and digestion. These reflexive responses include the secretion of digestive juices into the stomach and the secretion of certain hormones into the blood stream, and they induce a state of hunger. An example of conditioned hunger is the "appetizer effect." Any signal that consistently precedes a meal, such as a clock indicating that it is time for dinner, can cause people to feel hungrier than before the signal. The lateral hypothalamus (LH) is involved in the initiation of eating. The nigrostriatal pathway, which includes the substantia nigra, the lateral hypothalamus, and the basal ganglia have been shown to be involved in hunger motivation.
Conditioned emotional response[edit]
Further information: conditioned emotional response and fear conditioning
The influence of classical conditioning can be seen in emotional responses such as phobia, disgust, nausea, anger, and sexual arousal. A familiar example is conditioned nausea, in which the CS is the sight or smell of a particular food that in the past has resulted in an unconditioned stomach upset. Similarly, when the CS is the sight of a dog and the US is the pain of being bitten, the result may be a conditioned fear of dogs.
As an adaptive mechanism, emotional conditioning helps shield an individual from harm or prepare it for important biological events such as sexual activity. Thus, a stimulus that has occurred before sexual interaction comes to cause sexual arousal, which prepares the individual for sexual contact. For example, sexual arousal has been conditioned in human subjects by pairing a stimulus like a picture of a jar of pennies with views of an erotic film clip. Similar experiments involving blue gourami fish and domesticated quail have shown that such conditioning can increase the number of offspring. These results suggest that conditioning techniques might help to increase fertility rates in infertile individuals and endangered species.[38]
Pavlovian-instrumental transfer[edit]
Main article: Pavlovian-instrumental transfer
This section needs expansion. You can help by adding to it. (May 2017)
Pavlovian-instrumental transfer occurs when a conditioned stimulus that has been associated with a rewarding or aversive stimulus via classical conditioning alters the performance of operant behavior. In a typical experiment, a rat is presented with sound-food pairings (classical conditioning). Separately, the rat learns to press a lever to get food (operant conditioning). Test sessions now show that the rat presses the lever faster in the presence of the sound than in silence, although the sound has never been associated with lever pressing.
In popular culture[edit]
In the 1932 novel Brave New World by Aldous Huxley, conditioning plays a key role in the maintenance of social peace, especially in maintaining the caste system upon which society is based. Another example is in Anthony Burgess' 1962 dystopian novel A Clockwork Orange in which the novel's anti-hero and protagonist, Alex, undergoes a procedure called the Ludovico technique, where he is fed a solution to cause severe nausea and then forced to watch violent acts. This renders him unable to perform any violent acts without inducing similar nausea. Unintentionally, he also forms an aversion to classical music. In Orson Scott Card's 1999 science-fiction novel Ender's Shadow, "Pavlovian mental bans" are used to prevent crime. In The Guilt Trip, Part Three of Derren Brown's TV series The Experiments, Derren used Classical conditioning to make a man feel guilt at the sound of a bell.[39]
See also[edit]
Carrot and stick
Learned helplessness
Little Albert experiment
Nocebo
Measures of conditioned emotional response
Operant conditioning
Pavlovian-instrumental transfer
Placebo (origins of technical term)
Poison shyness
Preparedness (learning)
Proboscis extension reflex
Psychological manipulation
Quantitative analysis of behavior
Reward system
Stimulus control
References[edit]
Jump up ^ Cherry, Kendra. "What Is a Conditioned Response?". About.com Guide. About.com. Retrieved 2013-02-10.
^ Jump up to: a b c d e f g Shettleworth, Sara J.(2010) Cognition, Evolution, and Behavior (2nd edn) Oxford Univ. Press
^ Jump up to: a b Rescorla, Robert A. Pavlovian Conditioning — It's Not What You Think It Is. (1988) American Psychologist, 43, 151–160.
Jump up ^ Papini, M. R., & Bitterman, M. E. (1990). The role of contingency in classical conditioning. Psychological Review, 97(3), 396-403.
^ Jump up to: a b c d e f g h i j k l Bouton, M. E. (2016) Learning and Behavior: A Contemporary Synthesis (2nd ed), Sunderland, MA: Sinauer
^ Jump up to: a b Pavlov, I. P. (1927/1960). Conditional Reflexes. New York: Dover Publications (the 1960 edition is not an unaltered republication of the 1927 translation by Oxford University Press http://psychclassics.yorku.ca/Pavlov/).
Jump up ^ Douglas L. Medin, Brian H. Ross, and Arthur B. Markman. Cognitive Psychology. N.p.:n.p,2009. Print 50–53
Jump up ^ T.L. Brink (2008) Psychology: A Student Friendly Approach. "Unit 6: Learning." pp. 97–98
^ Jump up to: a b Chang, Raymond C.; Stout, Steven; Miller, Ralph R. "Comparing excitatory backward and forward conditioning." Quarterly Journal of Experimental Psychology: Section B January 2004. Vol. 57 Issue 1, pp. 1–23. State University of New York at Binghamton, New York, USA.
Jump up ^ Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. 69
Jump up ^ Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. p.66
Jump up ^ Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. pp.71
Jump up ^ Rescorla, R. A. (1967). Pavlovian conditioning and its proper control procedures. Psychological Review, 74, 71–80
^ Jump up to: a b Schacter, Daniel L (2009). PSYCHOLOGY. Catherine Woods. p. 267. ISBN 978-1-4292-3719-2.
Jump up ^ Chan, C. K. J.; Harris, Justin A. (2017-08-01). "Extinction of Pavlovian conditioning: The influence of trial number and reinforcement history". Behavioural Processes. SQAB 2016: Persistence and Relapse. 141 (Part 1): 19–25. doi:10.1016/j.beproc.2017.04.017.
Jump up ^ Shettleworth, S. J. (2010) Cognition, Evolution and Behavior (2nd Ed), New York: Oxford.
Jump up ^ Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. p. 84
Jump up ^ Rescorla, R. A. & A. R. Wagner (1972). A theory of Pavlovan conditioning: Variations in the effectiveness of reinforcement and nonreinforcement. In Classical Conditioning II: Current Theory and Research Black & Prokasy (eds), pp. 64–99. New York: Appleton-Century.
^ Jump up to: a b c d Miller, R. & M. Escobar Learning: Laws and Models of Basic Conditioning. In Stevens' Handbook of Experimental Psychology,(3rd Edition) Vol 3: Learning, Motivation & Emotion, Pashler & Gallistel, (eds) pp 47–102, New York: Wiley
Jump up ^ Chance, Paul. Learning and Behavior. Belmont, CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. p. 85
Jump up ^ Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print pp 85–89
^ Jump up to: a b Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print. pp. 85–89
Jump up ^ Miller, R. R., Barnet, R. C. & Grahame, N. J. (1995) Assessment of the Rescorla–Wagner model. Psychological Bulletin, 117, 363–386
Jump up ^ Mackintosh, N. J. (1975) A theory of attention: Variations in the associability of stimuli with reinforcement Psychological Review, 82, 276–298
Jump up ^ Pearce, J. M. & Hall, G. (1980) A model for Pavlovian learning: Variations in the effectiveness of conditioned but not of unconditioned stimuli Archived 2014-04-07 at the Wayback Machine.. Psychological Review, 87, 532–552.
Jump up ^ Gibbon, J. & Balsam P. (1981) Spreading association in time. In Locurto, Terrace & Gibbon (Eds.), Autoshaping and conditioning theory (pp. 219–235). New York: Academic Press
Jump up ^ Miller, R. R. & Escobar, M. (2001) Contrasting acquisition-focused and performance-focused models of acquired behavior. Current Directions in Psychological Science 10, 141–145.
Jump up ^ Gallistel, R. & Gibbon, J. (2000). Time, rate and conditioning. Psychological Review, 107, 289–304.
Jump up ^ Gallistel, R. & Gibbon, J. (2002) The Symbolic Foundations of Conditioned Behavior. Mahwah, NJ: Erlbaum
Jump up ^ Golkar, A., Bellander, M., & Öhman, A. (2013). Temporal properties of fear extinction--does time matter? "Behavioral neuroscience", 127(1), 59–69.
Jump up ^ Wagner, A. R. (1981). SOP: A model of automatic memory processing in animal behavior. In Spear & Miller (Eds.) Information processing in animals: Memory mechanisms (pp.5-47). Hillsdale, NJ: Erlbaum
Jump up ^ Steinmetz, J. E. "Neural Basis of Classical Conditioning" in Encyclopedia of Behavioral Neuroscience, Academic Press, 2010, pp 313-319s
Jump up ^ Kearney, Christopher A. Abnormal Psychology and Life: A Dimensional Approach. N.p.: n.p., January 1, 2011. Print. p.336
Jump up ^ Kearney, Christopher A. Abnormal Psychology and Life: A Dimensional Approach. N.p.: n.p., January 1, 2011. Print. p 136
Jump up ^ Kearney, Christopher A. Abnormal Psychology and Life: A Dimensional Approach. N.p.: n.p., January 1, 2011. Print. p 133
Jump up ^ McGee, Donald Loring. Behavior Modification. Wellness.com, Inc. 2006. Retrieved on 2012-2-14. http://www.wellness.com/reference/health-and-wellness/behavior-modification
Jump up ^ Carlson, Neil R. (2010). Psychology: The Science of Behaviour. New Jersey, United States: Pearson Education Inc. pp. 599–604. ISBN 978-0-205-64524-4.
Jump up ^ Carlson, Neil R. (2010). Psychology: The Science of Behaviour. New Jersey, United States: Pearson Education Inc. pp. 198–203. ISBN 978-0-205-64524-4.
Jump up ^ Tannice. "The Custard TV: Saturday Essay: Derren Brown: The Guilt Trip: a step too far or an elaborate hoax?". thecustardtv.com.
Further reading[edit]
Babsky, Evgeni; Boris Khodorov; Grigory Kositsky; Anatoly Zubkov (1989). "Chapter 17, the section 'Conditioned-Reflex Activity of the Cerebral Cortex'". In Babsky, Evgeni. Human Physiology, in 2 vols. 2. Translated by Ludmila Aksenova; translation edited by H. C. Creighton (M.A., Oxon). Moscow: Mir Publishers. pp. 330–357. ISBN 5-03-000776-8 First published in Russian as «Физиология человека»
Dayan, P.; Kakade, S. & Montague, P.R. (2000). Learning and selective attention. Nature Neuroscience, 3, 1218–23. Full text
Jami, S.A.; Wright, W.G. & Glanzman, D.L. (2007). Differential Classical Conditioning of the Gill-Withdrawal Reflex in Aplysia Recruits Both NMDA Receptor-Dependent Enhancement and NMDA Receptor-Dependent Depression of the Reflex. The Journal of Neuroscience, 27, 3064–8.
Kirsch, I.; Lynn, S.J.; Vigorito, M. & Miller, R.R. (2004). The role of cognition in classical and operant conditioning. Journal of Clinical Psychology, 60, 369–92.
Pavlov, I.P. (1927). Conditioned Reflexes: An Investigation of the Physiological Activity of the Cerebral Cortex (translated by G.V. Anrep). London: Oxford University Press. Google preview of Dover 2003 reprint
Rescorla, R.A. & Wagner, A.R. (1972). A theory of Pavlovian conditioning. Variations in effectiveness of reinforcement and non-reinforcement. In A. Black & W.F. Prokasky, Jr. (eds.), Classical Conditioning II New York: Appleton-Century-Crofts.
Schmidt, R. F. (1989). "Behavior Memory (Learning by Conditioning)". In Schmidt, Robert F.; Thews, Gerhard. Human Physiology. Translated by Marguerite A. Biederman-Thorson (Second, completely revised ed.). Berlin etc.: Springer-Verlag. pp. 155–156. ISBN 3-540-19432-0.
wiki book on Animal behavior
Chance, Paul. Learning and Behavior. Belmont/CA: Wadsworth, ISBN 0-495-09564-8, 2008. Print.
Moore, John W. A Neuroscientist’s Guide to Classical Conditioning, Springer Science & Business Media, ISBN 978-0387988054, 2012. Print.
Douglas L. Medin, Brian H. Ross, and Arthur B. Markman. Cognitive Psychology. N.p.:n.p,2009. Print.
Kearney, Christopher A. Abnormal Psychology and Life: A Dimensional Approach.N.p.: n.p., January 1, 2011. Print.
Hilgard E. R., D. G Marquis. Hilgard and Marquis' Conditioning and learning.. New York, Appleton-Century-Crofts, 1961. Print.
Razran, Gregory. Mind in evolution; an East-West synthesis of learned behavior and cognition. Boston, Houghton Mifflin, 1971. Print.
Black, A. H., W. F. Prokasy. Classical conditioning II: current research and theory. Appleton-Century-Crofts, 1972. Print.
External links[edit]
Library resources about
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Scholarpedia Classical conditioning
Scholarpedia Computational models of classical conditioning
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United States Secretary of State
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Not to be confused with Secretary of state (U.S. state government).
Secretary of State of the United States
Seal of the Secretary of State
Flag of the Secretary of State
Incumbent
Rex Tillerson
since February 1, 2017
United States Department of State
Style
Mr. Secretary
Member of
Cabinet, National Security Council
Reports to
The President
Seat
Washington, D.C.
Appointer
The President
with Senate advice and consent
Term length
Appointed
Constituting instrument
22 U.S.C. § 2651
Precursor
United States Secretary of Foreign Affairs
Formation
July 27, 1789; 228 years ago (1789-07-27)
First holder
John Jay (acting)
Thomas Jefferson
Succession
Fourth[1]
Deputy
John Sullivan
Salary
$205,700 annually[2] (Executive Schedule I)[3]
Website
www.state.gov
The Secretary of State is a senior official of the federal government of the United States of America, and as head of the U.S. Department of State, is principally concerned with foreign policy and is considered to be the U.S. government's equivalent of a Minister for Foreign Affairs.[4][5]
The Secretary of State is nominated by the President of the United States and, following a confirmation hearing before the Senate Committee on Foreign Relations, is confirmed by the United States Senate. The Secretary of State, along with the Secretary of the Treasury, Secretary of Defense, and Attorney General, are generally regarded as the four most important Cabinet members because of the importance of their respective departments.[6] Secretary of State is a Level I position in the Executive Schedule and thus earns the salary prescribed for that level (currently $205,700).[3]
The current Secretary of State is former ExxonMobil CEO Rex Tillerson, the 69th person to hold office since its creation in 1789.
Contents
[hide]
1 Duties and responsibilities
2 List of Secretaries of State
3 References
4 External links
Duties and responsibilities[edit]
The stated duties of the Secretary of State are as follows:[7]
"Supervises the United States Foreign Service" and "administers the Department of State"
Advises the President on matters relating to U.S. foreign policy including the appointment of diplomatic representatives to other nations and on the acceptance, recall, or dismissal of representatives from other nations
"Negotiates, interprets, or terminates treaties and agreements" and "conducts negotiations relating to U.S. foreign affairs"
"Personally participates in or directs U.S. representatives to international conferences, organizations, and agencies"
Provides information and services to U.S. citizens living or traveling abroad such as providing credentials in the form of passports
"Ensures the protection of the U.S. Government to American citizens, property, and interests in foreign countries"
"Supervises the administration of the U.S. immigration policy abroad"
Communicates issues relating the U.S. foreign policy to Congress and to U.S. citizens
"Promotes beneficial economic intercourse between the U.S. and other countries"
The original duties of the Secretary of State include some domestic duties such as:[citation needed]
Receipt, publication, distribution, and preservation of the laws of the United States
Preparation, sealing, and recording of the commissions of Presidential appointees
Preparation and authentication of copies of records and authentication of copies under the Department's seal
Custody of the Great Seal of the United States
Custody of the records of former Secretary of the Continental Congress except for those of the Treasury and War departments
Most of the domestic functions of the Department of State have been transferred to other agencies. Those that remain include storage and use of the Great Seal of the United States, performance of protocol functions for the White House, and the drafting of certain proclamations. The Secretary also negotiates with the individual States over the extradition of fugitives to foreign countries.[8] Under Federal Law,[9] the resignation of a President or of a Vice President is only valid if declared in writing, in an instrument delivered to the office of the Secretary of State. Accordingly, the resignations of President Nixon and of Vice-President Spiro Agnew, domestic issues, were formalized in instruments delivered to the Secretary of State, Henry Kissinger.
As the highest-ranking member of the cabinet, the Secretary of State is the third-highest official of the executive branch of the Federal Government of the United States, after the President and Vice President and is fourth in line to succeed the Presidency, coming after the Vice President, the Speaker of the House of Representatives, and the President pro tempore of the Senate. Six Secretaries of State have gone on to be elected President. Others, including John Kerry, William Seward, Henry Clay, William Jennings Bryan and Hillary Clinton have been unsuccessful presidential candidates, either before or after their term of office as Secretary of State.
The nature of the position means that Secretaries of State engage in travel around the world. The record for most countries visited in a secretary's tenure is 112 by Hillary Clinton.[10] Second is Madeleine Albright with 96.[11] The record for most air miles traveled in a secretary's tenure is 1.380 million miles by John Kerry.[12] Second is Condoleezza Rice's 1.059 million miles, and third is Clinton's 956,733 miles.[10]
What are the Qualifications of a Secretary of State? He ought to be a Man of universal Reading in Laws, Governments, History. Our whole terrestrial Universe ought to be summarily comprehended in his Mind.
“
”
—John Adams[13]
List of Secretaries of State[edit]
Further information: List of Secretaries of State of the United States
References[edit]
Jump up ^ "3 U.S. Code § 19 - Vacancy in offices of both President and Vice President; officers eligible to act". Cornell Law School.
Jump up ^ "Pay & Leave: Salaries & Wages". Salary Table No. 2015-EX. United States Office of Personnel Management. January 1, 2015. Retrieved January 4, 2016.
^ Jump up to: a b 5 U.S.C. § 5312.
Jump up ^ "Heads of State, Heads of Government, Ministers for Foreign Affairs", Protocol and Liaison Service, United Nations. Retrieved November 2, 2012.
Jump up ^ NATO Member Countries, NATO. Retrieved November 2, 2012.
Jump up ^ Cabinets and Counselors: The President and the Executive Branch (1997). Congressional Quarterly. p. 87.
Jump up ^ "Duties of the Secretary of State". U.S. Department of State. Retrieved 2017-02-01.
Jump up ^ "Duties of the Secretary of State of the United States". www.state.gov. United States Department of State. January 20, 2009. Retrieved March 28, 2010.
Jump up ^ "3 U.S. Code § 20 - Resignation or refusal of office".
^ Jump up to: a b Mark Landler (January 4, 2013). "Scare Adds to Fears That Clinton's Work Has Taken Toll". The New York Times.
Jump up ^ Lee, Matthew (June 28, 2012). "Frequent flier Hillary Clinton hits 100-country mark". Detroit Free Press. Associated Press. Archived from the original on June 28, 2012.
Jump up ^ Associated Press (April 6, 2016). "Kerry breaks record for miles traveled by secretary of state". Fox News.
Jump up ^ Ford, Worthington C., ed. (1927). Statesman and Friend: Correspondence of John Adams with Benjamin Waterhouse, 1784–1822. Boston, MA: Little, Brown, and Company. p. 57.
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Current U.S. order of precedence (ceremonial)
Preceded by
Ambassadors from the United States
(while at their posts) Order of Precedence of the United States
as Secretary of State Succeeded by
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(in order of tenure)
Preceded by
Otherwise Barack Obama
as Former President Succeeded by
Otherwise António Guterres
as Secretary-General of the United Nations
Current U.S. presidential line of succession
Preceded by
President pro tempore of the Senate
Orrin Hatch 4th in line Succeeded by
Secretary of the Treasury
Steve Mnuchin
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United States Secretaries of State
Secretary of Foreign Affairs
1781–89
R. Livingston
Jay
Secretary of State
1789–present
Jefferson
Randolph
Pickering
J. Marshall
Madison
Smith
Monroe
Adams
Clay
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E. Livingston
McLane
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Root
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Vance
Muskie
Haig
Shultz
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Clinton (tenure)
Kerry (tenure)
Tillerson
[show]
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Agencies under the United States Department of State
Headquarters: Harry S Truman Building
Rex Tillerson, Secretary of State
John Sullivan, Deputy Secretary of State and Deputy Secretary of State for Management and Resources
Tom Shannon, Under Secretary of State for Political Affairs
Deputy Secretary of State and
Deputy Secretary of State for Management and Resources
Counselor of the Department
Executive Secretariat
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Operations Center
Under Secretary for
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Bureau of African Affairs
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Under Secretary for
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Bureau of Economic and Business Affairs
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Office of the Science and Technology Adviser to the Secretary
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Under Secretary for
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Bureau of Arms Control, Verification and Compliance
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Under Secretary for
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Under Secretary for
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Foreign Service Institute
Office of Children's Issues
Office of eDiplomacy
Office of Foreign Missions
Office of Management Policy, Rightsizing, and Innovation
Office of Medical Services
Office of White House Liaison
Under Secretary for
Civilian Security, Democracy, and Human Rights
Bureau of Conflict and Stabilization Operations
Bureau of Counterterrorism and Countering Violent Extremism
Bureau of Democracy, Human Rights, and Labor
Bureau of International Narcotics and Law Enforcement Affairs
Bureau of Population, Refugees, and Migration
Office of Global Criminal Justice
Office of Global Youth Issues
Office to Monitor and Combat Anti-Semitism
Office to Monitor and Combat Trafficking in Persons
Bureaus/Offices
reporting directly to the Secretary
Bureau of Intelligence and Research
Bureau of Legislative Affairs
Office of Civil Rights
Office of Inspector General
Office of the Legal Adviser
Office of Policy Planning Staff
Office of the Chief of Protocol
Office of Global Food Security
Office of Global Women's Issues
Office of the United States Global AIDS Coordinator
Office of Global Partnerships
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Leaders of the United States federal executive departments
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Presidential line of succession in the United States of America
Vice President (Mike Pence)
Speaker of the House of Representatives (Paul Ryan)
President pro tempore of the Senate (Orrin Hatch)
Secretary of State (Rex Tillerson)
Secretary of the Treasury (Steven Mnuchin)
Secretary of Defense (Jim Mattis)
Attorney General (Jeff Sessions)
Secretary of the Interior (Ryan Zinke)
Secretary of Agriculture (Sonny Perdue)
Secretary of Commerce (Wilbur Ross)
Secretary of Labor (Alex Acosta)
Secretary of Health and Human Services (Alex Azar)
Secretary of Housing and Urban Development (Ben Carson)
Secretary of Transportation (Elaine Chao[a])
Secretary of Energy (Rick Perry)
Secretary of Education (Betsy DeVos)
Secretary of Veterans Affairs (David Shulkin)
Secretary of Homeland Security (Kirstjen Nielsen)
Jump up ^ Although Elaine Chao is the current Secretary of Transportation, she is not a natural-born citizen (acquired U.S. citizenship by naturalization) and thus ineligible for the Presidency.
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