<human>:  How did brain training start?
<bot>: Brain training is a relatively new field. It started in the late 20th century when scientists began to realize that the brain is not a static organ, but rather a dynamic system that can be trained. In the early 2000s, scientists began to study the effects of brain training on cognitive abilities, such as memory and attention. They found that brain training can improve cognitive abilities, such as memory and attention.