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Unformatted text preview: Chapter 14: The parietal lobe
Theories of function
Symptoms of parietal damages
Clinical neuropsychological assessment I. Anatomy
I. Lateral surface: central fissure, Sylvian fissure.
Sylvian Medial surface: parietal – occipital sulcus. Postcentral gyrus (Brodmann’s areas 1, 2, 3). Angular gyrus (Brodmann’s area 39). Two Zone:
Two Anterior zone including postcentral gyrus.
Posterior zone including angular gyrus. II. Theories of function
A. Anterior Zone: concerned with somatic
sensations and perceptions; involved in
stereognosis – the ability to perceive objects
through sense of touch.
through B. Posterior Zone: specialized for integrating
somatic, visual, auditory inputs; involved in
visual perception of location. III. Symptoms of parietal damages
A. Damage to the anterior zone. Marked changes in somatosensory threshold. Afferent paresis: clumsy fingers due to
lesions to the postcentral gyrus.
lesions Astereognosis: an inability to identify objects
by Asomatognosia: the failure to recognize parts
of one’s own body.
of B. Damage to the posterior zone
B. Balint’s syndrome: due to damage to the superior
Balint’s parietal region; patients show optic ataxia, ocular
apraxia, Contralateral neglect: due to damage to the right
Contralateral inferior parietal region; patients neglect part of the
body or space contralateral to the lesion.
body Gerstmann syndrome: due to damage to the
Gerstmann left parietal region; including finger agnosia,
right-left confusion, agraphia, and aculculia.
right-left Apraxia: due to damage to the left inferior
Apraxia: parietal cortex; inability to make voluntary
movements Ideomotor apraxia: inability to copy
movements or to make gestures Constructional apraxia: inability to assemble
objects. IV. Clinical neuropsychological assessment
A. Two-point discrimination: somatosensory
B. Seguin-Goddard form board: tactile form
C. Line bisection: contralateral neglect.
D. Mooney Closure and Gollin Incomplete Figures:
visual perception capacity.
E. Right-Left differentiation: ability to perceive
F. Token: language comprehension.
G. Kimura Box: apraxia. ...
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This note was uploaded on 05/25/2011 for the course PSYCHOLOGY 492 taught by Professor Xu during the Fall '10 term at Grand Valley State University.
- Fall '10