A hallucination is the experience of sensing something that isn't really present in the environment but is instead created by the mind. Hallucinations can be seen, heard, felt, smelled, and tasted, ...

My life suddenly began to fall apart when I was an honors student at the University of Southern California studying biochemistry and molecular biology. My grades dropped, and I withdrew from a ...

Hallucinations are internally generated sensory experiences. In short, the perception of something for which there is no stimulus. Given there is the addition of something present, this is considered ...

Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...