Upload-P431-Chapter 13 - Chapter 13: The occipital lobe...

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Unformatted text preview: Chapter 13: The occipital lobe Chapter I. Anatomy II. Theories and functions III. Disorders of vision A. Damage to the primary visual pathway B. Damage to the cortex C. Case studies of visual problems I. Anatomy I. Medial surface: parietal-occipital sulcus, Calcarine fissure. Calcarine Brodmann’s areas 17, 18, 19. Six different occipital regions:V1, V2, V3, V3A, Six V4, V5 (MT). V4, Visual streams: Visual to the inferior temporal cortex – ventral (what). to to the posterior parietal cortex – dorsal (where). II. Theories of functions II. A. Perceptions of movement: V1 V2 V5 (STS stream along the V1 superior temporal sulcus). superior B. Perception of form: Ventral stream. C. Perception of Location: Dorsal stream. D. Perception of color: D. blob in V1 V2 V4. blob III. Disorders of vision III. A. Damage to the primary visual pathway Destruction of optic nerve anopia in one eye Destruction Destruction of optic chiasm bitemporal Destruction hemianopia hemianopia Destruction of optic tract contralateral Destruction hemianopia hemianopia Partial lesions to geniculostriate radiations Partial contralateral quadrantic anopia contralateral Extensive lesions of V1 Macular sparing Extensive B. Damage to the cortex B. Small lesion in V1 scotoma Small Total loss of V1 blindsight Total Lesions in association cortex visual agnosia: Lesions an inability to perceive or identify visual stimuli. an apperceptive visual agnosia: inability to apperceptive identify shape. identify prosopagnosia: inability to identify face associative visual agnosia: can perceive but associative cannot name. cannot Balint’s syndrome: includes optic ataxia – a Balint’s deficit in reaching for objects under visual guidance; ocular apraxia – a deficit of eye fixation; simultagnosia – inability to perceive more than one object at a time. more C. Case studies of visual problems C. 1. 2. 3. 4. 5. 6. 7. Case B. K. Case D. B. Case J. I. Case P.B. Case L. M. Case D. F. Case V. K. ...
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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.

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