Cognitive Psychology PSYC231 Perception 1 Dr. Jan Lauwereyns, EA619, ext. 5042.

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Presentation transcript:

Cognitive Psychology PSYC231 Perception 1 Dr. Jan Lauwereyns, EA619, ext. 5042

Structure of the eye

Motion agnosia: inability to perceive motion How do I put this thing in that slot? e.g., Unable to see whether cars are moving or standing still Damage to area MT (Medial Temporal): Module in the dorsal stream ?

The "Where" (Dorsal) Stream: Spatial Processing Localising things in space Coordination of spatial reference frames (Lateral Intra-Parietal cortex, LIP) e.g., what do you mean by “left”? Left on my retina?Retinotopy Left of me?Craniotopy Egocentric (head-centered) (body-centered) Left of the door?Allocentric (object-centered) (world-centered)

Did I just move my eyes or was that the object moving? Franciscus Aguilonius, 1613 : Theory of efference copy

Efference copy Copy of movement command to perceptual structures Movement on the retina, due to movement of your eyeball or movement of objects in the environment? If I move my eyes, than stationary objects should get a different position on the retina Can create illusions…

While making eye movements, our eyes detect similar information on the same portion of the retina, and so they conclude that these things must have been moving along, but this can’t be…

3D extraction: A study by Tsutsui et al., 2002, Science Studying individual neurons in area CIP (caudal part of lateral bank of intraparietal sulcus) that code depth informationStudying individual neurons in area CIP (caudal part of lateral bank of intraparietal sulcus) that code depth information While the monkey judges the 3D orientation of slant surfacesWhile the monkey judges the 3D orientation of slant surfaces Binocular or visual depth cues from texture gradient Binocular or visual depth cues from texture gradient

Example of a neuron with a preference for surface slants that go from Right-close by to Left-farExample of a neuron with a preference for surface slants that go from Right-close by to Left-far Can extract this 3D surface orientation based on texture gradient both with dots (top) and lines (middle), but also based on binocular disparity (with red- green goggles)Can extract this 3D surface orientation based on texture gradient both with dots (top) and lines (middle), but also based on binocular disparity (with red- green goggles)

Goodale & Milner: Dorsal, spatial = “Vision for Action” Ventral, object = “Vision for Perception”

Prosopagnosia: Face blindness