Factors limiting peripheral pattern discrimination H. S. ORBACH 1,* and H. R. WILSON 2 1 Department of Vision Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 OBA, United Kingdom 2 Visual Sciences Center, University of Chicago, 939 East 57th Street, Chicago, IL 60637, USA Received 1 1 August 1998; revised 10 October 1998; accepted 1 November 1998 Abstract-Previous reports indicate that some foveally discriminable compound gratings are indis- criminable in peripheral vision, even when they are scaled by the ratio of peripheral to foveal grating acuity. To determine the stimulus properties that limit peripheral discrimination, we used Gaussian derivatives of various orders. These patterns are spatially localized and have intrinsic even or odd symmetry. Our results show that certain odd symmetric patterns are discriminable in the periphery, while others are not. Furthermore, certain even symmetric patterns are not peripherally discriminable. These data are consistent with three limitations on peripheral pattern discrimination: (1) Patterns that produce different maximum neural responses will be peripherally discriminable. (2) Positional uncer- tainty and undersampling degrade discrimination of high spatial frequency patterns in the periphery. (3) Patterns generating substantial neural activity within a constrained region are processed as textures in peripheral vision so that
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1999
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