Hallucinations is the title of Dr. Oliver Sacks' latest book, and in it he presents hundreds of case studies and stories about those who see, hear, feel and even smell things that aren't really there. We talk with Dr. Sacks about the phenomenon of aural hallucinations of phantom voices, music, and sounds -- which, he says, is much more common than most would think, and often isn't related to mental illness. 

Oliver Sacks, physician, professor of neurology and psychiatry at Columbia University Medical Center and author of, most recently, The Mind's Eye, has more stories about the brain and its mysterious malfunctions, this time all to do with vision.

It has happened to you. Some song wriggles its way into your brain and won't leave. Now imagine that the distant tune in the back of your head suddenly becomes very real. A real song. Real drums. Real guitar. Volume. These are called musical hallucinations and there are some people ...

The story of a man who’s lost everything. Clive Wearing has what Oliver Sacks calls “the most severe case of amnesia ever documented.” Clive’s wife, Deborah Wearing, tells us the story along with Oliver Sacks. And they try to understand why, amidst so much forgetting, Clive remembers two things: Music ...