The effect of exposure duration on the analysis of spatial structure in eccentric vision JUKKA SAARINEN Departments of Psychology and Physiology, University of Helsinki, SF-00170 Helsinki, Finland Received 18 November 1987; revised and accepted 17 February 1988 Abstract-There is some evidence from grating experiments that the transient presentation of a stimulus pattern interferes with the encoding of positional relationships between pattern elements (i.e. the analysis of spatial structure) more in eccentric vision than in central vision. The present study investigated the effect of exposure duration on the analysis of spatial structure in eccentric vision using a task in which the observer discriminated between two mirror symmetric patterns consisting of short line segments. In each trial, the two patterns were flashed for 140 or 500 ms, and the observer had to decide whether the patterns were identical or mirror symmetric. Both constant-size and size-scaled patterns were used in eccentric vision. The longer exposure duration slightly increased the proportion of correct responses in eccentric vision but performance remained distinctly inferior to that in central vision. INTRODUCTION There is strong evidence that eccentric vision is inferior to central vision in the analysis of the spatial structure of a stimulus pattern, i.e.
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1988
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