February 1989
Volume 30, Issue 2
Free
Articles  |   February 1989
Analysis of spatial structure in eccentric vision.
Author Affiliations
  • J Saarinen
    Department of Psychology, University of Helsinki, Finland.
  • J Rovamo
    Department of Psychology, University of Helsinki, Finland.
  • V Virsu
    Department of Psychology, University of Helsinki, Finland.
Investigative Ophthalmology & Visual Science February 1989, Vol.30, 293-296. doi:
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      J Saarinen, J Rovamo, V Virsu; Analysis of spatial structure in eccentric vision.. Invest. Ophthalmol. Vis. Sci. 1989;30(2):293-296.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

The analysis of spatial structure, ie, the encoding of relative positions between pattern elements, was studied in central and eccentric vision. In a two-alternative forced-choice task the observer had to discriminate between two patterns consisting of short line segments. At each trial the two patterns were flashed for 140 msec and the observer indicated whether the patterns were identical or mirror symmetric. Psychometric functions were measured by changing pattern size at each eccentricity in order to find the threshold size allowing 75% of correct responses. The scaling factor, required for discriminating between mirror symmetric and identical patterns independent of eccentricity, was found to be similar to the size-scaling proposed by Levi et al (Vision Res 25:963, 1985) for vernier acuity tasks.

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