Perception & Psychophysics

, Volume 21, Issue 5, pp 445–449

The oblique effect in a vernier acuity situation

  • Thomas R. Corwin
  • Anne Moskowitz-Cook
  • Marc A. Green
Article

DOI: 10.3758/BF03199500

Cite this article as:
Corwin, T.R., Moskowitz-Cook, A. & Green, M.A. Perception & Psychophysics (1977) 21: 445. doi:10.3758/BF03199500
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Abstract

Observers viewed either vertical or obliquely oriented vernier targets from either an upright position or with their heads tilted. Vernier acuity was consistently better for retinally vertical than for gravitationally vertical targets, even when presented against a background context of vertical stripes designed to aid veridical perception of gravitational orientation. These results indicate that vernier acuity depends on retinal image orientation rather than on perceived orientation. The high contrast of the vernier lines ensures that their gravitational orientation is clearly perceived. Thus the present results provide a stronger basis for ruling out the effects of perceptual orientation than previous studies involving grating contrast-threshold measurements. Since the vernier targets were presented as brief flashes, it is unlikely that the measured oblique effect is attributable to differences in eye-movement patterns.

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Copyright information

© Psychonomic Society, Inc. 1977

Authors and Affiliations

  • Thomas R. Corwin
    • 1
  • Anne Moskowitz-Cook
    • 1
  • Marc A. Green
    • 1
  1. 1.Center for Visual Science, Department of PsychologyUniversity of RochesterRochester
  2. 2.Pennsylvania College of OptometryPhiladelphia19141