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 |
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England
Elsevier Ltd
1983
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Abstract | 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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AbstractList | 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. 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 zero-crossings in the second derivative of the retinal light distribution. 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, the authors have demonstrated that vernier acuities of the order of 5 sec are 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 zero-crossings in the second derivative of the retinal light distribution. |
Author | Morgan, M.J. Watt, R.J. |
Author_xml | – sequence: 1 givenname: R.J. surname: Watt fullname: Watt, R.J. – sequence: 2 givenname: M.J. surname: Morgan fullname: Morgan, M.J. |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/6868385$$D View this record in MEDLINE/PubMed |
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Snippet | Vernier acuity demonstrates a fine sense of relative visual location, which can be exploited to examine the question of mechanisms for the extraction of... |
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SubjectTerms | Humans Light Models, Neurological Retina - physiology Sensory Thresholds - physiology Space life sciences Space Perception - physiology |
Title | Mechanisms responsible for the assessment of visual location: Theory and evidence |
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