Interactive effects within visual patterns on the discriminability of individual elements.

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Abstract
The problem is whether perceptual accuracy for individual elements of a tachistoscopic pattern is determined by relative position within the pattern, or by absolute position on the retina. Binary patterns of 17, 9, or 5 open and blackened zeros were exposed horizontally across fixation to 4 Os, who attempted to reproduce the pattern. Spacing of targets was varied so that it was possible to compare performance at the same retinal position within targets having different numbers of elements, and also at different retinal positions for elements at the same ordinal position within targets having the same number of elements. For each O errors were fundamentally predictable from relative position within a pattern of a given length. Therefore, accuracy was determined by interaction among elements, and mnemonic organization, rather than by retinal sensitivity.

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