From the Archives: Exploring the Link Between Neurology and Creativity.

Clinical neurology professor and doctor Oliver Sacks is the author of six books about his patients, people with autism, Parkinson's Disease, Tourette's Syndrome, and other neurological disorders. Sacks was portrayed by Robin Williams in the 1991 film version of his book "Awakenings." His other books include "A Leg to Stand On," and "The Man Who Mistook His Wife for a Hat." His newest is "An Anthropologist On Mars: Seven Paradoxical Tales," which tells the stories of the disorders of seven of his subjects.

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.

Neurologist Oliver Sacks is famous for his case studies of people with neurological disorders that cause unusual problems with perception. In The Mind's Eye, Sacks turns to himself, explaining how an eye tumor affected his vision and perception of the world.