graphesthesia
Pronunciation: graf-es-THEE-zee-ah
The ability to recognize letters, numbers, or shapes traced on the skin, typically tested on the palm or fingertips.
Full Definition
Graphesthesia is a form of cortical sensory function that involves the recognition of letters, numbers, or simple geometric shapes traced on the skin surface, usually on the palm of the hand or fingertips. This test assesses the integrity of the posterior parietal cortex and its connections, particularly the postcentral gyrus and superior parietal lobule. Impaired graphesthesia (agraphesthesia) suggests dysfunction in cortical sensory processing areas and is often tested alongside other cortical sensory functions such as two-point discrimination and stereognosis. The test requires intact primary sensation and higher-order cortical processing capabilities.
Usage
Usage note: Test with patient's eyes closed; document which hand was tested and specific deficits.
In Context
- "Graphesthesia testing revealed impaired number recognition on the left palm." — Sensory examination
- "Normal graphesthesia helped confirm intact cortical sensory processing pathways." — Neurological assessment