Visual hallucination
Visual Hallucination
Visual hallucination (/vɪʒuːəl hæljuːsɪˈneɪʃən/) is a type of hallucination that involves perceiving something visually that does not actually exist.
Etymology
The term "visual hallucination" is derived from the Latin words "visus" meaning "sight" and "hallucinari" meaning "to wander in the mind".
Definition
A visual hallucination is a perception in the absence of a stimulus which has qualities of real perception, in that it is vivid, substantial, and located in external objective space. It is often associated with a variety of conditions including psychiatric disorders, neurological disorders, and substance use.
Types of Visual Hallucinations
There are several types of visual hallucinations, including:
- Simple visual hallucinations: These are hallucinations that involve seeing lights, geometric shapes, or flashes of color.
- Complex visual hallucinations: These are hallucinations that involve seeing people, scenes, or objects that are not there.
- Peduncular hallucinosis: This is a rare type of visual hallucination that is often associated with lesions in the midbrain.
- Charles Bonnet Syndrome: This is a condition characterized by complex visual hallucinations in individuals with significant visual loss.
Causes
Visual hallucinations can be caused by a variety of conditions, including:
- Schizophrenia
- Parkinson's disease
- Alzheimer's disease
- Migraine
- Brain tumor
- Substance-induced hallucinations
Treatment
Treatment for visual hallucinations often involves treating the underlying cause. This may include medication, therapy, or other interventions. In some cases, visual hallucinations may be managed through the use of antipsychotic medication.
External links
- Medical encyclopedia article on Visual hallucination
- Wikipedia's article - Visual hallucination
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