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Lecture 11

PSY 201 Lecture 11: Notes for lecture 11 including clicker questions with answers

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PSY 201
Dasa Zeithamova Demircan

Visual Pathways Retinotopy: Primary visual cortex and many higher order visual cortices contain topographic map of the retina Magnification: Fovea is overrepresented, periphery is underrepresented About of cortex processes visual information From V1, information travels to V2, and then to many more visual areas Two primary visual pathways Dorsal stream: analysis of motion and spatial relations Depth and motion Ventral stream: analysis of form and color Evidence for what and where pathways Temporal lobe lesion: leads to problems with object discrimination Parietal lobe lesion: leads to problems with landmark localization Damage to inferior temporal cortex in humans visual agnosia Can see but cant recognize what they see Sometime limited to one or two categories (cannot recognize animals, or tools, or faces) Ventral pathway specializes in object recognition, irrespective of location, orientation and viewpoint Region: rods cones, ganglion cells, primary visual cortex, ventral visual cortex Preferred stimulus: light of specific wavelength, spots of light contrasting from surround, lines of specific orientation, specific objects, any viewpoint Optic Ataxia: damage to the parietal lobe disrupts where visual processing Clicker Question 1: there are two basic cortical pathways for visual information. A dorsal stream and a ventral stream. What type of information does the ventral stream process? Object identification Clicker Question 2: A patient suffered a stroke after which she perceives world as a series of snapshots. She recognizes a car in a distance but is surprised when it barely misses her just a split second later. Where is the lesion likely located? Parietal cortex Parallel processing The brain processes color movement, form, and depth simultaneously in different areas The brain integrates the separate, parallel dimensions of visual info interpreted in different areas Binding problem: how are features linked together so that we see unified objects rather than free floating or mis combined features? Features integration theory: focused attention is not required to detect the individual features that comprise a stimulus but attention is the glue that binds individual features into a whole percept Error in binding: illusory conjunction Reconstructing the world Inverse problem
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