June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Collinearity and surround size effects on spatial discrimination tasks
Author Affiliations
  • Michael L. Kramer
    Department of Psychology, Miami University, OH 45056
  • Lynn A. Olzak
    Department of Psychology, Miami University, OH 45056
Journal of Vision June 2006, Vol.6, 199. doi:10.1167/6.6.199
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Michael L. Kramer, Lynn A. Olzak; Collinearity and surround size effects on spatial discrimination tasks. Journal of Vision 2006;6(6):199. doi: 10.1167/6.6.199.

      Download citation file:


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

      ×
  • Supplements
Abstract

Previous research has shown both collinear facilitation in contrast detection tasks (Solomon & Morgan, Vis. Res., 2000) and a lack of any collinear effects in apparent contrast tasks (Cannon & Fullenkamp, Vis. Res., 1991). The present study was performed to better understand the effect of spatial characteristics of surrounds on suprathreshold spatial discrimination tasks. The tasks used were hyperacuity orientation (centered around vertical) and spatial frequency (centered around 4 cpd) discriminations between 40-minarc, circular center patches of sinusoidal grating. Surrounds were vertical sinusoidal grating rings at exactly 4 cpd, with a ring width of 40-minarc. Surround size and location was modulated using BOW-TIE style stimuli (Cannon & Fullenkamp, Vis. Res., 1991) in order to specifically test how collinearity (or its lack) affects fine spatial discriminations. Discriminability was measured using d' values (obtained from a 6 point response scale). Our preliminary results suggest that collinear surrounds have a stronger inhibitory effect on these discrimination tasks when compared to non-collinear side-flanks of equal size. Our results also suggest that for most people, increasing surround size increases this inhibitory effect.

Kramer, M. L. Olzak, L. A. (2006). Collinearity and surround size effects on spatial discrimination tasks [Abstract]. Journal of Vision, 6(6):199, 199a, http://journalofvision.org/6/6/199/, doi:10.1167/6.6.199. [CrossRef]
Footnotes
 Supported by NEI EY13953 to LAO.
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×