Change Blindness Notes - PSYC325 Cognitive Psychology...

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Unformatted text preview: PSYC325 Cognitive Psychology 2/14/08 Agenda : Change Blindness Attn & News Stories Scientific Method Visual Attn: Seeing Things in the Environment When we focus attn on 1 part of visual array, how much info. do we register about the other parts of a display? Li et al. (2002) Task 1: Look at letter display. Are all letters same? Task 2: Animal present in scene shown for 27 ms. outside of focused area? L L L L L Heres an (approx.) e.g.: Was there an animal? All the letters the same? But this limited to certain types of visual array. People OFTEN dont even notice large visual changes in scene. Change blindness. http://viscog.beckman.uiuc.edu/grafs/demos/23.html http://viscog.beckman.uiuc.edu/grafs/demos/12.html People notice person-change < 30% of the time Exp. was live; Ps were asked directions. Results : 50% didnt notice person-change even though different voice. In-group/out-group effect. (See also examples in textbook in Change Blindness section.) And consider the flicker experiments What's the Difference btwn Looking & Seeing? http://www.psych.ubc.ca/~rensink/flicker/ Many traffic accidents are of the type "driver looked but failed to see". Here, drivers collide with pedestrians in plain view, with cars directly in front of them (the classic "rear-ender"), and even run into trainsIn such cases, info. from the world is entering the driver's eyes. But at some point along the way this information is lost, causing the driver to lose connection with reality. They are looking but they are not seeing. What's going on? findings indicate that the critical factor is attention: To see an object change, it is necessary to attend to it ....
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This note was uploaded on 04/27/2008 for the course PSYC 325 taught by Professor Forster during the Spring '07 term at University of Arizona- Tucson.

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Change Blindness Notes - PSYC325 Cognitive Psychology...

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