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, ...

Psychosis is popularly portrayed as visual hallucinations and paranoid delusions (e.g., "A Beautiful Mind," "Shutter Island"). Psychotic conditions, like schizophrenia-spectrum disorders, actually ...

When someone sees something that isn't there, people often refer to the experience as a hallucination. Hallucinations occur when your sensory perception does not correspond to external stimuli.

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 ...