Definition of "astereognosis" []

• The inability to identify an object by touch without visual input; a form of tactile agnosia. (noun)

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• "If the patient experiences difficulty and if his naming ability as previously tested is intact, he is manifesting astereognosis, which could be due to dysfunction of the contralateral in this case, the nondominant parietal lobe or of interhemispheric connections, such as the corpus callosum."
• "Irritative lesions of the sensory mechanism cause numbness and tingling (paræsthesia); more extensive paralytic lesions produce anæsthesia, astereognosis, loss of muscle sense, loss of pain, or inability to distinguish temperature, according to the tracts that are affected."