منابع مشابه
Orientation anisotropy in vernier acuity
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 ...
متن کاملSpatio-temporal vernier acuity.
The study of space-time vernier (STV) provides information on the spatio-temporal structure of the visual system in the same way that the classical spatio-spatial vernier (SSV) provides information on its spatial structure. The transposition of a SSV task into a STV one yields the following experimental format: an object (in the present case a Gaussian Blob) drifts with a constant velocity, V, ...
متن کاملAnisotropies in peripheral vernier acuity.
Vernier acuity for short horizontal, vertical and oblique target lines was measured in many locations in the periphery of the visual field in normal human observers. In the 10 deg periphery, the average alignment threshold with oblique vernier lines in eight locations for three observers was 2.29 times higher than that with vertical and horizontal target lines. This oblique effect was found eve...
متن کاملVernier acuity in barn owls
Vernier acuity thresholds were obtained psychophysically in three adult barn owls with vertical bars and sinusoidal gratings. A minimal displacement threshold of 0.58 arcmin was observed with the bar stimulus under binocular viewing conditions. The mean binocular bar threshold was 2.51 arcmin. Bar thresholds were lower than grating thresholds. Monocular thresholds, obtained in one bird only, we...
متن کاملResolution Acuity is better than Vernier Acuity
Our impressive sensitivity to vernier offsets as compared to resolution acuity has long inspired vision researchers to study the phenomena in great detail. In this study we use the test-pedestal framework to compare resolution and vernier acuity. In these experiments the test stimulus is the same for both tasks, only the pedestals differ. When thresholds are expressed in common units of test st...
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ژورنال
عنوان ژورنال: Vision Research
سال: 1995
ISSN: 0042-6989
DOI: 10.1016/0042-6989(95)00001-1