What hallucination reveals about our minds

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NOVEMBER 22, 2014 TODAY’S CLASSIC TED TALK Oliver Sacks: What hallucination reveals about our minds 18:48 minutes · TED2009 Oliver Sacks draws our attention to Charles Bonnet syndrome, which causes visually impaired people to experience vivid hallucinations. Peer into the fascinating biology of this under-reported phenomenon that reveals surprising insight into how our brains work. Watch now »     PLAYLIST OF THE DAY 10 most popular science talks Spellbinding, stimulating, seductive … science! Meet the most watched science talks on TED.com.  Watch » 10 TED Talks · Total run time 2:30:41