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The role of transparency in perceptual grouping and pattern recognition

Examined the shortest stimulus exposure time for which transparency can be seen. In Exp 1, overlapping digits were presented for 120 msec and the luminance in the overlapping regions was varied. Five Ss reported, in separate blocks of trials, either the apparent transparency or the identity of the digits. When the luminance was set so that 1 set of digits appeared to be seen through the other, recognition of the digits was high. When the luminance in the overlapping regions did not produce impressions of transparency, digit recognition was low. In Exp 2 with 5 Ss, digit identification at several stimulus durations was compared between stimuli having luminance that was valid for transparency and stimuli having invalid luminance. Performance was higher in the valid luminance than in the invalid condition after 60 msec exposure duration. Results suggest that the impression of transparency requires only relatively short exposure durations. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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