lec02-1 - Introduction to Perception Psychology 355:...

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Introduction to Perception Psychology 355: Cognitive Psychology Winter Quarter 2009 1/12/2009
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P 355, Miyamoto, Winter '09 2 Outline • Why do we study perception in a cognition course? o Perception is the basis for cognition o Many important ideas in cognitive psychology are best explained in terms of examples from the theory of perception o In Psych 355, we don’t try to survey the perception topic. We focus on aspects that are relevant to cognitive theory. • Top Down Processes in Letter Recognition (time permitting) e.g., perceiving the letter “K” Two overarching ideas: • Perceptual objects are represented as configurations of features • Higher order processes make use of context and expectations to influence perception Next: Definition of Top Down & Bottom Up Processes
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P 355, Miyamoto, Winter '09 3 Bottom Up and Top Down Processing • Bottom up processing – processing of current stimulation influences what is perceived • Top down processing – person’s background knowledge, learning and expectancies influence what is perceived. Bottom up is data driven. Top down is theory-driven and knowledge-driven. Next: Examples of Top Down and Bottom Up Processing
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P 355, Miyamoto, Winter '09 4 Examples: Top Down versus Bottom Up Processes • When people see a plane crash, at least some of the witnesses always claim to have seen flames coming from the engines. o (Top-down when claim is false; either top-down or bottom up when it is true.) • People easily perceive a particular color, e.g., ± , even though they have no reason to expect to see this particular color. (bottom up) • Scene understanding involves both top-down and bottom-up processing. Top-down processing:
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This note was uploaded on 10/05/2009 for the course PSYCH 355 taught by Professor Miyamoto during the Winter '08 term at University of Washington.

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lec02-1 - Introduction to Perception Psychology 355:...

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