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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Published in | Vision research (Oxford) Vol. 23; no. 1; pp. 97 - 109 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
England
Elsevier Ltd
1983
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Subjects | |
Online Access | Get full text |
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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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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0042-6989 1878-5646 |
DOI: | 10.1016/0042-6989(83)90046-9 |