Hallucination

Tell me about
your mother
Psychology

For our next session...

* Cognitive biases

* Mental health

* Superstition

* Famed psychologists

Popping into your mind

* Psychological projection
* Schadenfreude
* Freudian slip
* Psychosomatic
* Brainwashing
* Rationalization
* Social science
* Persecution complex
* Pedophilia

v \- t \- e

A hallucination is a "perception without a stimulus" — in other words, seeing something that isn't there. It is distinct from delusion, or demonstrably false belief of pathological origin; however, the two are often caused by the same mental illnesses.

Hallucinations are often a symptom of certain mental illnesses, such as schizophrenia, certain forms of dementia, Parkinson's disease,[1] and epilepsy.[2] They can also be experienced due to the ingestion of psychoactive substances, most notably LSD.

There are two common forms of hallucination unrelated to mental illness called hypnagogic and hypnopompic hallucinations, the former occurring before sleep and the latter during the process of waking up. Blurred vision and switching between alert and sleeping states can cause anyone to see strange things. These hallucinations can create false memories. Similarly, sleep paralysis can cause memorably frightening hallucinations. There are many other conditions of high mental or bodily stress during which a person may possibly experience hallucinations.

## See also[edit]

* Mass hysteria
* Religion — a common side-effect of hallucinations

## Notes[edit]

1. ↑ See the Wikipedia article on Parkinson's disease.
2. ↑ See the Wikipedia article on Epilepsy.

This medicine-related article is a stub.
You can help RationalWiki by expanding it.