PMID: 8594813Sep 1, 1995Paper

Orientation anisotropy in vernier acuity

Vision Research
J Saarinen, D M Levi

Abstract

An oblique effect is evident in vernier acuity for abutting lines. In Experiment 1 we show that the oblique effect in vernier acuity exists over a range of contrast levels, and is evident even when the horizontal and oblique lines are equally detectable or discriminable. Since this oblique effect cannot be explained by the lower visibility of oblique vernier lines or of the "dipole" cue, it is unlikely to be a consequence of lower neuronal sensitivity. In Experiment 2 we measured the orientation and spatial frequency tuning characteristics of vernier acuity for horizontal and oblique (45 deg) stimuli using a simultaneous masking paradigm. Our results showed no significant differences between either the orientation or spatial frequency tuning for horizontal and oblique stimuli; thus the oblique effect is unlikely to result from differences in the tuning of neurons sensitive to the oblique meridians. Finally, in Experiment 3, we tested the notion that the oblique effect for vernier judgments might reflect limitations imposed beyond the initial filtering operation by measuring vernier acuity for horizontal and oblique lines with either the observer of the frame tilted at an angle of 45 deg. The oblique effect for vernier followed ...Continue Reading

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Citations

Jan 14, 2011·Advances in Cognitive Psychology·A K M Rezaul Karim, Haruyuki Kojima
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Jan 25, 2020·I-Perception·Yoshitaka Fujii, Takeharu Seno

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