Mechanisms responsible for the assessment of visual location: Theory and evidence

Vernier acuity demonstrates a fine sense of relative visual location, which can be exploited to examine the question of mechanisms for the extraction of position information. By determining the appearance and location of composite stimuli consisting of a number of unresolved parallel bars of differe...

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Bibliographic Details
Published inVision research (Oxford) Vol. 23; no. 1; pp. 97 - 109
Main Authors Watt, R.J., Morgan, M.J.
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 1983
Subjects
Humans
Light
Models, Neurological
Retina - physiology
Sensory Thresholds - physiology
Space life sciences
Space Perception - physiology
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Summary:Vernier acuity demonstrates a fine sense of relative visual location, which can be exploited to examine the question of mechanisms for the extraction of position information. By determining the appearance and location of composite stimuli consisting of a number of unresolved parallel bars of different luminances, we have demonstrated that vernier acuities of the order of 5 sec arc are due to mechanisms with an inflexible manner of encoding local intensity changes in the retinal image. The results are compared and contrasted with current theoretical approaches to the problems of early visual coding and are best described by a model which encodes only the occurrence and location of zerocrossings in the second derivative of the retinal light distribution.
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ISSN:0042-6989
1878-5646
DOI:10.1016/0042-6989(83)90046-9