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Abstract

4 experiments examined S's tendency to reproduce more accurately elements about reference points, i.e., fixation (fixation facilitation) and extreme positions (end-segregation), of binary patterns. Exp. I varied pattern length from 4 to 28 elements. As predicted, end-segregation was greatest for intermediate lengths, and absent for longer patterns. Unexpected results were an end-segregation effect for shortest patterns and no fixation facilitation. In Exp. II, pairs of elements at all eccentric positions were more accurately reproduced when presented alone. Exp. III found no fixation facilitation with 28-element patterns and fixation-reference markers on the responding templates. Exp. IV tested the hypothesis that the fixation marker had masked central elements in Exps. I and III. Fixation facilitation appeared with 28- and 12-element patterns when a smaller marker was used. These experiments show that mnemonic factors affect differential perceptual accuracy among elements in tachistoscopic patterns.

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Effect of Reference Points and Masking on Tachistoscopic Pattern Perception

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