Advanced
Technical
In the Industry Vocabulary Test
astereognosis
Pronunciation: ah-ster-ee-og-NO-sis
Inability to identify objects by touch alone, indicating sensory cortex damage.
Full Definition
The inability to recognize and identify objects through tactile sensation alone, despite intact primary touch sensation. Astereognosis results from damage to the somatosensory association areas of the parietal cortex and represents a form of tactile agnosia. Patients can feel that an object is present but cannot determine its shape, size, texture, or identity through touch.
Usage
Usage note: Prefix 'a-' indicates absence. Test by having patient identify objects placed in hand while blindfolded.
In Context
- "Testing revealed astereognosis in the right hand following parietal lobe stroke." — Neurological examination
- "The patient's astereognosis significantly impacted activities requiring fine tactile discrimination." — Occupational therapy assessment
Also known as
tactile agnosia
stereoanesthesia
Contrasted with
intact stereognosis
Don't confuse with
tactile anesthesia
agnosia