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inability to recognize the import of sensory impressions; the varieties correspond with several senses and are distinguished as auditory (acoustic), gustatory, olfactory, tactile, and visual.
finger agnosia loss of ability to indicate one's own or another's fingers.
tactile agnosia inability to recognize familiar objects by touch. See also astereognosis.
time agnosia loss of comprehension of the succession and duration of events.
visual agnosia inability to recognize familiar objects by sight, usually due to a lesion in one of the visual association areas. Called also object blindness and psychic blindness.
visual-spatial agnosia (visuospatial agnosia) lack of the ability to analyze and orient using visual representations and their spatial relationships.
inability to recognize objects by touch, in the presence of intact cutaneous and proprioceptive hand sensation; caused by a lesion in the contralateral parietal lobe.
tactile agnosiaNeurology Impaired tactile sensation, with inability to recognize objects by touch, a common finding in parietal lobe tumors; TA is a subtle, nondisabling disorder caused by unilateral damage to parietotemporal cortices that may be severe in left brain infarcts DiffDx Astereognosis, a complex somatosensory disorder, tactile aphasia. See Agnosia.
tac·tile ag·no·si·a(tak'til ag-nō'zē-ă)
Inability to recognize objects by touch, in the presence of intact cutaneous and proprioceptive hand sensation; caused by a lesion in the contralateral parietal lobe.