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The effect of similarity and duration on spatial interaction in peripheral vision FRANK L. KOOI1, ALEX TOET1, SRIMANT P. TRIPATHY2 and DENNIS M. LEVI2 ' TNO Institute for Human Factors, PO Box 23, 3769 ZG, Soesterberg, The Netherlands 2College of Optometry, University of Houston, Houston, TX, USA Received for publication 25 October 1993 Abstract � Spatial interactions are extensive in the peripheral visual field, extending up to about half the retinal eccentricity of the target (Toet and Levi, Vision Res. 32, 1349-1357, 1992). In the present study it is shown that the degree and extent of peripheral spatial interaction depends in large measure on the similarity between test and flanking stimuli. The stimulus consisted of a test T surrounded by four distracting flanking Ts, each randomly oriented. The task was to determine the orientation of the test T. The test and flanking Ts differed in contrast polarity, shape, depth, color, eye of origin, or contrast. When the target and flanks differed in contrast polarity, depth, or shape, performance improved markedly for all observers. A color difference enhanced the performance of most but not all observers. Eye-of-origin had no effect, that is, spatial interaction was identical when the target
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1994
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