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Hallucinations

Hallucinations are sensory experiences that do not correspond to reality.  They are considered to be a form of psychosis. Common forms of hallucinations include:

    Auditory hallucinations:  These are the most common form of hallucinations occurring in the context of psychiatric conditions.  They involve the experience of hearing one or more voices speaking.  The voices may or may not have identities known to the person experiencing them.  Sometime the voices are experienced as coming from the outside, sometimes from within one's head, and sometimes they are described as being the person's own voice.  Oftentimes these voices will say insulting, hurtful or disturbing things to the person.  Command hallucinations are when these voices are commanding the person to do certain acts, which often have a potential for harm to others or to oneself. 

    Visual hallucinations:  These are the second most common form of hallucinations in psychiatric conditions, and involve the experience of seeing visions that are not in fact occurring.

    Tactile hallucinations:  These hallucinations involve the feeling of something touching or crawling on one's skin.  This occurs most commonly as a result of withdrawal or intoxication from substances like alcohol, cocaine or heroin.

    Olfactory hallucinations:  This is the experience of smelling certain smells.  This occurs most commonly in neurological conditions.

    Hypnogogic hallucinations:  These are hallucinations, usually auditory or visual, which occur as a person is about to fall asleep.  This type of hallucination is not considered pathological and is not a cause for concern.  Some people are more prone than others to have these sorts of hallucinations, which tend to occur more often during times of stress or sleep deprivation.

    Hypnopompic hallucinations:  These are hallucinations, usually auditory or visual, which occur as a person is waking up from sleep.  This type of hallucination is not considered pathological and is not a cause for concern.  Some people are more prone than others to have these sorts of hallucinations, which tend to occur more often during times of stress or sleep deprivation.

Delusions

Catatonia