NEUROPSYCHOLOGY & BEHAVIORAL NEUROSCIENCE
C J Long
Overview of Topics
Dysfunctions caused by Lesions
A. Right hemisphere - intact functioning of this area of the cortex contributes to the individual's ability to orient himself in space, reproduce constructions, and recognize objects through visual or tactile cues. Facial recognition appears to be a function of right parietal cortex as well.
Dysfunction may produce:
- Right-left homonymous hemianopsia - severe visual field cuts (1, 2, 3). Test: visual exam, copy drawings, reading ability.
- Contralateral hemianaesthesia - global anesthesia to all modalities affecting the left side of the body, but with grossly preserved motor and postural control of the involved limbs (4).
- Paragnosia - difficulty with visual recognition of objects - also called visual agnosia (5, 6, 7).
Test: Naming tasks, visual recognition tasks.
- Prosopagnosia - recognition of faces (8, 9, 10, 11). Test: Tachistoscopic recognition of faces, behavioral observation.
- Spatial loss greater than with lesion to left hemisphere (12, 13,14). Test: constructional ability tests.
- Unilateral spatial agnosia - neglect or inattention to one side in spatial orientation (15, 16, 17, 18).
Test: Drawings of designs, block design, Incomplete Pictures.
- Visuospatial Dysgnosia - loss of "whereness", relation of self to environment and relations of objects to each other (19). Test: Drawings of designs, loss of way in familiar surroundings, tests of right-left orientation.
- Anosognosia - lack of awareness of defect (20, 21).
Test: Self-report by patient-interview.
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