Hallucinations is a 2012 book written by the neurologist Oliver Sacks.

In Hallucinations, Sacks recounts stories of hallucinations and other mind-altering episodes of both his patients and himself and uses them in an attempt to elucidate certain features and structures of the brain[1] including his own migraine headaches.

The hallucinations mentioned in this book come from the everyday citizen and his own experiences, which are used to connect the structure and function of the brain of a healthy person to the symptom of hallucination.

Sacks also mentions the positive effects of hallucinations in culture and art.

[4] Sacks notes that the symptom of hallucinations have a negative connotation that was created by society.