astereognosis
Pronunciation: ay-STEER-ee-og-NO-sis
Inability to recognize objects by touch alone when vision is occluded, despite intact primary tactile sensation.
Full Definition
Astereognosis is a neurological deficit characterized by the inability to identify objects through tactile exploration when visual cues are removed, despite preservation of basic touch sensation. This condition results from lesions in the parietal cortex, particularly areas involved in tactile processing and integration. Astereognosis is commonly assessed during neurological examinations using common objects like keys, coins, or paper clips. The condition may occur unilaterally or bilaterally and can significantly impact daily functioning activities that require tactile discrimination.
Usage
Usage note: Test by having patient identify objects by touch with eyes closed. Ensure basic tactile sensation is intact before diagnosing.
In Context
- "Testing revealed astereognosis in the patient's left hand, consistent with right parietal lobe dysfunction." — Neurological examination report
- "The presence of astereognosis complicated the patient's ability to perform activities of daily living." — Occupational therapy assessment