Hallucinations are unreal sensory experiences, such as hearing or seeing something that is not there. Any of our five senses (vision, hearing, taste, smell, touch) can be involved. Most often, when we ...

A new study from the Netherlands Institute for Neuroscience shows how flickering light can cause hallucinations in our brain: it produces "standing waves" of brain activity. The work is published in ...

Sleep deprivation can lead to hallucinations, a situation that can get progressively worse the longer you are without sleep. Hallucinations from sleep deprivation are more likely to occur after 24 ...

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, ...

Dear Carol: My dad has had heart disease for years. He recently had a stroke that left him weak on one side but otherwise he seems to have recovered physically. Mentally, he's not doing so well. He ...

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 ...