Human Neuropsychology

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Created by:

ktktruon  on December 7, 2011

Subjects:

Psychology

Description:

Visual Agnosia

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Human Neuropsychology

Apperceptive Agnosia
- part of object agnosia
- failure of object recognition in which basic visual functions are preserved (acuity, color, motion)
- inability to develop percept of structure of an object
- Case D.F.
- gross bilateral damage to lateral parts of occipital lobes
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Definitions

Apperceptive Agnosia - part of object agnosia
- failure of object recognition in which basic visual functions are preserved (acuity, color, motion)
- inability to develop percept of structure of an object
- Case D.F.
- gross bilateral damage to lateral parts of occipital lobes
Multagnosia/simultagnosia - can perceive basic shape but cannot perceive more than 1 object at the same time
- patient claimed blindness but really just overwhelmed at task at hand
Associative Agnosia - inability to recognize object despite its perception
- can copy drawing but can't identify it
- lesions to anterior temporal lobes
Prosopognosia - facial agnosia - can't recognize faces but can recognize face information such as birthmark, mustache, hairdo
Alexia - in ability to read - damage to left fusiform and ligual areas
- only left hemisphere appears to be able to combine letters to form words
Form of object agnosia inability to construct perceptual wholes from parts
Form of associative agnosia - case word memory is either damaged or inaccessible
- damage to left fusiform and lingual areas
Visual Imagery Summary - neural structures mediating perception and visualization of objects are not completely independent
- mental rotation of objects is superior in right hemisphere; related to dorsal stream
- image generation occurs in left temporal-occipital region
Snapshot: generating mental images - concrete words increase activation in left posterior temporal-occipital region

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