Spatial scaling of vernier acuity tasks

Vision Res. 1992 Aug;32(8):1481-91. doi: 10.1016/0042-6989(92)90204-v.

Abstract

Vernier acuity thresholds for two abutting lines and for a two-dot stimulus were measured as a function of stimulus magnification at eccentricities of 0, 5, 10 and 15 deg using a spatial scaling technique in which all stimuli are simply magnified versions of each other. The advantage of such a technique is that no prior knowledge of a suitable magnification factor with which to increase the size of peripheral stimuli is required. Thresholds for the line stimulus could be successfully scaled by the application of a magnification factor with an E2 value of 1.23-1.78 deg. Further, provided that the effects of dot separation and eccentricity were dissociated, spatial scaling with an E2 value of 1.06-1.96 deg was also successful in removing eccentricity dependence for two-dot vernier thresholds.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Fovea Centralis / physiology
  • Humans
  • Pattern Recognition, Visual / physiology*
  • Sensory Thresholds / physiology
  • Visual Acuity / physiology
  • Visual Cortex / physiology
  • Visual Fields / physiology