Visual extinction
Visual Extinction
Visual extinction (/ˈvɪʒuəl ɪkˈstɪŋkʃən/) is a neurological disorder characterized by the inability to perceive multiple stimuli of the same type simultaneously. The term is derived from the Latin extinctio, meaning 'extinguishing' or 'making invisible'.
Definition
Visual extinction is a condition where a person is unable to perceive a stimulus in the presence of another stimulus. This typically occurs when both stimuli are presented simultaneously and in close spatial proximity. It is most commonly observed in patients with parietal lobe damage, particularly in the right hemisphere.
Symptoms
The primary symptom of visual extinction is the inability to perceive a second identical stimulus when two are presented simultaneously. This can occur in any sensory modality, but is most commonly observed in the visual domain. Other symptoms may include hemispatial neglect, difficulty in visual attention, and problems with spatial awareness.
Causes
Visual extinction is typically caused by damage to the parietal lobe of the brain, particularly the right hemisphere. This damage can be due to a variety of causes, including stroke, traumatic brain injury, and certain neurological diseases such as Alzheimer's disease.
Treatment
Treatment for visual extinction typically involves neuropsychological rehabilitation, which may include techniques such as visual scanning training, prism adaptation, and other forms of cognitive therapy. The goal of treatment is to improve the patient's ability to perceive multiple stimuli simultaneously.
Related Terms
- Hemispatial neglect: A condition characterized by reduced awareness of stimuli on one side of space.
- Parietal lobe: The region of the brain associated with processing sensory information.
- Neuropsychological rehabilitation: A treatment approach aimed at improving cognitive function following brain injury.
External links
- Medical encyclopedia article on Visual extinction
- Wikipedia's article - Visual extinction
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