<human>: Can you give me the gist of the text in a nutshell?

I've always noticed and wondered about this unique little phenomenon. Which I think sadly does not get its credit due. For clarification, how is it that when we think about things we can "hear" our voice in our head? How do we learn to use this nifty little swiss army knife of a trait, and, perhaps more interestingly, how is it that we can do this same thing but with somebody ELSE'S voice in place of our own? For instance, I was just reading a chapter out of this book "The Never Ending Days of Being Dead" by Marcus Chown (side-note if anybody has read it and has books on the same topic I would very much so appreciate recommendations) and as I was reading a few lines I felt somewhat inspired after having just watched a "Through the Wormhole" episode with the unanimously beloved Morgan Freeman as narrator, and as I was reading I was able to read aloud the words in my thoughts but in HIS voice without missing a beat. I've done this many a time and only for some reason just thought to ask you fine gents and ladies. Thanks in advance! Also, for those of you that stuck it out thus far and are still reading this, what other phenomena about the brain/consciousness/thoughts do you find deliciously intoxicating?
<bot>: I was reading some shit and instead of reading the words "out loud" in my head I did it with Morgan Freeman's voice. What sorcery is this?