Mainstream society tends to associate hallucinations and delusions with the drug-addled and the mentally ill, but in reality they stem from many different sources and provide some amazing insight into how the brain works. Charles Bonnet syndrome, for example, involves the visually impaired “seeing” some incredibly vivid images that aren’t there. Neurological anthropologist Oliver Sacks has studied this phenomenon and discusses his interesting findings regarding perception, cognition and brain activity.
Watch the TED Talk here
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