lec2-2010 - 1 Readings This Week: Perception MRM: Chapter 3...

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1 Readings This Week: Perception MRM: Chapter 3 Rensink RA, O'Regan JK, and Clark JJ (1997). To see or not to see: The need for attention to perceive changes in scenes. Psychological Science, 8 , 368-373. Next Meeting: Attention MRM: Chapter 4 Czerwinski, M., Horvitz, E. & Wilhite, S. (2004). A Diary Study of Task Switching and Interruptions. In Proceedings of ACM Human Factors in Computing Systems CHI 2004, p. 175-182.
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2 Key Terms – Last week Behaviorism Cog neuroscience Cog psychology Cog science Computational level Connectionist models Ecological validity Empiricism Implementation level Information processing Introspection Mathematical models PDP models Recursive decomposition
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3 Constructivist view Perception is driven by cognition Cognition, in turn, is driven by perception “Old” idea from (Niesser, 1967 ) http://huwi.org/2.php
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4 Constructivist view Process of how this works is a matter of current debate Symbolic Connectionist Dynamic Will discuss low-level vision today, in 4-part harmony erception is driven by cognition ognition, in turn, is driven by perception
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5 Part 1: The eye is NOT a camera
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6 Vision Dynamic range of 10 13 Can detect stimulus as faint as photon Pupillary regulation ~ 16x
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7
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8
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9 Peripheral Processing Photo receptors are interconnected and can reciprocally inhibit one another Evidence from limulus (horseshoe crab) eye & other compound eyes Acts like filter to sharpen perceived edges Can be tuned for feature recognition Cells in cat’s visual cortex respond selectively to angle of lines on retina
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10 Herring Grid
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11 Perception is not a direct copy of the environment
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12 Mach Bands Ernst Mach, 1914
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13 Lateral Inhibition 8 8 8 8 8 Imagine light hitting retina and passed directly along: 8 8 8 8 8
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Lateral Inhibition 8 8 4 4 4 What if neighbors are different? 4
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This note was uploaded on 09/28/2010 for the course SIS IS2300 taught by Professor Brianbutler during the Fall '10 term at Pittsburgh.

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lec2-2010 - 1 Readings This Week: Perception MRM: Chapter 3...

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