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Lecture 15

Lecture 15 online notes.docx

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Department
Psychology
Course
Psychology 1000
Professor
Dr.Mike
Semester
Winter

Description
Lecture #16 –Thursday, November 1, 2012 Topic: Perception II  Depth Perception  Size Constancy  Perceptual Problem Solving How do we perceive depth? What happens after we determine object distance? How do we figure out what we’re looking at? A researcher is recording from visual cell. The cell shows maximum firing to a port of  light at a particular area on the screen. A slit of light decreases firing rate. Where is the  researcher recording from? Retinal Ganglion Depth Perception ­ Binocular (two eyes) versus monocular (one eye) cues ­ Binocular cues: Retinal disparity – gives us depth based on our calculation in  each eye o One image is slightly removed from the other ­ Monocular cues o Relative size – objects that are larger are closest to us (all other things  remaining the same); Most common o Overlap – when one image interrupts second image, image that is most  complete is closer to us o Linear Perspective – straight lines recede and converge into distance at  vanishing point (Biggest cue we use to make sense of 2d images) o Texture Gradient – looking at density; as objects fade into distance they  increase in density Size Constancy ­   e­scale the size of objects so they remain constant at any distance ­ Learned (first couple of months) ­ Many visual illusions reflect inappropriate constancy scaling; illusion is general  when you do constancy scaling when you shouldn’t ­ Retinal size pitted against linear perspective ­ Constancy Scaling I.e. Muller­Lyer Illusion (classic constant scaling ­ Gibson said constancy scaling is a result of growing up in a world with similiarity  of doors/r
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