| Astereognosis |
| Classification and external resources |
| ICD-9 |
780.99 |
Astereognosis is the inability to identify an object by touch without visual input. It is a form of tactile agnosia in which an individual is unable to identify objects by handling them, despite intact sensation.[1] With the absence of vision (i.e. eyes closed), an individual with astereognosis is unable to identify what is placed in their hand.[1] As opposed to agnosia, when the object is observed visually, one should be able to successfully identify the object.
Astereognosis is associated with lesions of the parietal lobe or dorsal column[2] or parieto-temporo-occipital lobe (posterior association areas) of either the right or left hemisphere of the cerebral cortex.[1]
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