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

Active Activity Any Autonomous Become Brain Does Find Functional Going Happen Hearing Imagery Imagination Involved Parts Perception Seeing Super Themselves While Will You

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