Lec 14 percep & memory - lecture

Lec 14 percep & memory - lecture -...

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Cognition: Perception, Memory Foundations of Occupation:  Neuroscience
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Outline 1. Lateralization of function 2. Perceptual deficits a. Agnosia b. Unilateral neglect c. Complex perceptual deficits d. Apraxia 1. Memory 2. Clinical correlations – Memory deficits a. Amnesia b. Korsakov’s Syndrome c. Dementia d. Alzheimer’s Disease
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Lateralization of Function: Left
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Lateralization of Function: Right
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Perception Definition: the integration of sensory impressions into psychologically meaningful information For a deficit in perception, basic sensation must be intact Most, but not all, perceptual deficits are associated with the right hemisphere
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Association Cortices
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Simple Perceptual Deficits:  Agnosia Agnosia : general term for the inability to recognize or make sense of incoming information despite intact sensory capabilities Can affect any modality (vision, audition, taste, etc.) and anything (faces, colors, objects)
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Types of Agnosias Alexia: Inability to comprehend written language Anosognosia: Lack of awareness or denial of severity of paralysis; lack of insight. Prosopagnosia: inability to recognize familiar faces http://www.faceblind.org/facetests/index.php
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Types of Agnosia Tactile agnosia or astereognosis Inability to recognize objects by touch and manipulation alone Impaired perception of shape, texture, temperature, weight, density Tactile recognition processes must be integrated with precision motor skills in order to extract salient contours and to enable appropriate handling of an object.
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Types of Agnosia Visual Object Agnosia Inability to visually recognize objects despite having intact vision http://www.youtube.com/watch?v=rwQpaHQ0hYw
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Types of Agnosia Auditory agnosia: Can perceive sounds but not recognize them Left: unable to understand speech Right: interferes with interpretation of environmental sounds
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Unilateral Neglect Also called hemi- inattention; hemi-spatial neglect Failure to respond or orient to stimuli presented contralateral to brain lesion Most commonly lesion in right hemisphere; inferior parietal lobe or superior temporal lobe
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http://www.youtube.com/watch?v=rB4w_R5APp8
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Unilateral Neglect Important implications for OT because of the occupational deficits Occupations: Personal/ADLs: Extrapersonal Confusion
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Theoretical Models of Unilateral  Neglect Disrupted attention: Orient spatial attention ipsilesionally Diminished attentional capacity and breakdown of specific elementary attentional operations Representation of Space: Inability to develop a representation of space on the side contralateral to the lesion
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Lec 14 percep & memory - lecture -...

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