With any hallucinations, if you can do functional brain...

With any hallucinations, if you can do functional brain imagery while they're going on, you will find that the parts of the brain usually involved in seeing or hearing - in perception - have become super active by themselves. And this is an autonomous activity; this does not happen with imagination.

Oliver Sacks Quote About Active, Autonomous, Functional, Hearing, Imagery: With Any Hallucinations If You...

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