Astereognosis

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]

References

^ ^a ^b ^c O'Sullivan, S.B. (2007). Physical Rehabilitation (5th Edition ed.). Philadelphia: F.A. Davis Company. pp. 1180–1181. {{cite book}}: |edition= has extra text (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ Normal">"Sensory > Normal".

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[O'Sulivan-1] O'Sullivan, S.B. (2007). Physical Rehabilitation (5th Edition ed.). Philadelphia: F.A. Davis Company. pp. 1180–1181. {{cite book}}: |edition= has extra text (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

[urlSensory-2] Normal">"Sensory > Normal".

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See also

References