The nature of tactile agnosia: A case study

A chronic tactile agnosic with a small, MRI-documented left inferior parietal infarction underwent detailed somesthetic testing to assess (1) the acquisition of sensory data, (2) the manipulation of somatosensory percept and its association with previous knowledge, and (3) recognition occurring at a...

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Bibliographic Details
Published in:Neuropsychologia 1994-05, Vol.32 (5), p.527-539
Main Authors: Reed, Catherine L., Caselli, Richard J.
Format: Article
Language:English
Subjects:
Adult and adolescent clinical studies
Agnosia - physiopathology
Agnosia - psychology
Biological and medical sciences
Brain Mapping
Cerebral Infarction - physiopathology
Cerebral Infarction - psychology
Dominance, Cerebral - physiology
Female
Functional Laterality - physiology
Humans
Magnetic Resonance Imaging
Medical sciences
Middle Aged
Neuropsychological Tests
Organic mental disorders. Neuropsychology
Parietal Lobe - physiopathology
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Stereognosis - physiology
Touch - physiology
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Summary:A chronic tactile agnosic with a small, MRI-documented left inferior parietal infarction underwent detailed somesthetic testing to assess (1) the acquisition of sensory data, (2) the manipulation of somatosensory percept and its association with previous knowledge, and (3) recognition occurring at a deeper taxonomic level. Results suggest that tactile agnosia can arise from faulty high-level perceptual processes, but that the ability to associate tactually defined objects and object parts with episodic memory can be preserved. Consistent with anatomic and physiologic studies in nonhuman primates, inferior parietal cortex (including Brodmann area 40, possibly area 39) appears to serve as a high-level somatosensory region.
ISSN:0028-3932
1873-3514
DOI:10.1016/0028-3932(94)90142-2