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Oliver Sacks stroking his chin during a lecture

Oliver Sacks

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12 segments
35:50

Oliver Sacks, Exploring How Hallucinations Happen

The famed neurologist talks to Fresh Air about how grief, trauma, brain injury, medications and neurological disorders can trigger hallucinations -- and about his personal experimentation with hallucinogenic drugs in the 1960s.

50:19

Oliver Sacks, Exploring How Hallucinations Happen.

The famed neurologist talks to Fresh Air about how grief, trauma, brain injury, medications and neurological disorders can trigger hallucinations — and about his personal experimentation with hallucinogenic drugs in the 1960s.

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