PS_attention - 1 Attention in Visual Perception Definition...

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Unformatted text preview: 1 Attention in Visual Perception Definition of attention : Selection of information for specialized processing usually in the context of some goal or task Questions : What are the kinds of specialized processing? Where does the selection occur along the path from stimulus to behavioral response? What kinds of information can be selected? How is the information selected? 2 Find Waldo. Find all the antlers. These tasks demonstrate selective attention. 3 Change Blindness Compare this image to the one after the next slide. Find what is missing. This demonstrates that some kind of specialized processing must be selected and applied in the first image (and second image) in order to notice what is missing in the second. 4 Change Blindness 5 Change Blindness 6 Controlled experiments for studying covert selection (attention). This is the Posner cueing paradigm. 7 Another popular task is the visual search task where set size (number of cued locations) is varied. There have been two theories of the set size effects: serial processing of each cued location and entirely parallel processing of each location. Both predict set size effects. 8 Predictions of parallel processing model of covert search based on signal-detection theory (SDT). 9 Comparison of the two models for accuracy in a covert search task (Eckstein, 1998). The parallel (SDT) model also predicts the performance in the Posner cueing task. 10 Questions About Visual Search With Eye Movements How should the eyes be moved when searching with a foveated visual system? Do humans use rational eye movement strategies in performing visual search? If not, what strategies do humans use? 11 15 Example of a fixation search task. In this task the subject is looking for a windowed spatial sine wave target in a background of 1/ f noise....
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This note was uploaded on 08/12/2008 for the course PSY 323P taught by Professor Geisler during the Spring '08 term at University of Texas.

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PS_attention - 1 Attention in Visual Perception Definition...

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