from The Century Dictionary.
- noun A defect in tactile sensation, which causes inability to estimate the form or substance of a body by touch.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
inabilityto identifyan objectby touchwithout visual input; a form of tactile agnosia.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a loss of the ability to recognize objects by handling them
from Wiktionary, Creative Commons Attribution/Share-Alike License
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.