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]

See also

• Stereognosis

References

de:Astereognosie fr:Ast r ognosie nl:Astereognosie