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Visual Attention.docx

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University of Guelph
PSYC 2390
Lana Trick

Visual Attention 11/8/2012 4:29:00 PM Attention and Ability to Perceive Perception can Occur Without Focused Attention:  Central task condition  letters flashed in center where observer is looking and need to indicate if all letters are the same o Face or green disc is presented off to side  Peripheral task condition  letters are flashed as in central task condition and are instructed to look at letters, need to indicate whether face flashed off to side was female or male or if disc flashed to side was red or green  Dual task condition  asked both if all letters in middle are same and whether male or female in periphery or whether green or red disc  When they only have 2 task, do well o Also perform well in dual tasks o Can take in information about faces even when attention is not focused on the faces o Lower performance on disc colour in periphery when in dual tasks  Have more experience perceiving faces, more meaningful, initially perceive faces as a whole Perception can be Affected by Lack of Focused Attention: Inattentional Blindness  Failure to perceive a stimulus that isn’t attended even if it is in full view o Gorilla and basketball passes Change Detection  Present picture then present slightly different picture  Change blindness: difficulty detecting changes in scenes  Continuity errors  seen in videos (her hair is behind her ear in this shot but in the next shot it isn’t)  Key difference between changes in real life and changes in experiment o Changes in real life are often accompanied by motion (cue that change is occurring) Doe
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