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 | |
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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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| Cites_doi | 10.1016/0042-6989(82)90048-7 10.1038/279189a0 10.1016/0042-6989(82)90193-6 10.1113/jphysiol.1966.sp008056 10.1088/1475-4878/21/4/302 10.1016/0042-6989(73)90026-6 10.1098/rstb.1976.0090 10.1364/JOSA.69.000914 10.1007/BF02979265 10.1016/0042-6989(75)90012-7 10.1016/0042-6989(77)90151-1 10.1016/0042-6989(79)90117-2 10.1364/JOSA.67.000207 10.1016/0042-6989(77)90206-1 10.1364/JOSA.70.000868 10.1364/JOSA.54.000931 |
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| References | French (bib9) 1919; 21 Wilson, Bergen (bib26) 1979; 19 Westheimer (bib22) 1975; 14 Watt, Andrews (bib18) 1981; 1 Snyder, Laughlim, Stavenga (bib17) 1977; 17 Ditchburn (bib7) 1973 Westheimer, Hauske (bib24) 1975; 15 Barlow (bib3) 1981; 212 Crick, Marr, Poggio (bib6) 1981 Morgan, Watt (bib16) 1982; 22 Harris (bib10) 1964; 54 Westheimer (bib23) 1977; 67 Watt, Morgan, Ward (bib20) 1982 Westheimer, McKee (bib25) 1977; 17 Marr, Poggio, Ullman (bib14) 1979; 69 Finney (bib8) 1971 Watt, Andrews (bib19) 1982; 22 Marr, Poggio, Hildreth (bib15) 1980; 70 Marr (bib12) 1976; 275 Andrews, Butcher, Buckley (bib1) 1973; 13 Marr, Hildreth (bib13) 1980; 207 Camphell, Gubisch (bib5) 1966; 196 Hering (bib11) 1899 Barlow (bib2) 1979; 279 Bracewell (bib4) 1978 Westheimer (bib21) 1972; Vol. VII 2 French (10.1016/0042-6989(83)90046-9_bib9) 1919; 21 Marr (10.1016/0042-6989(83)90046-9_bib12) 1976; 275 Hering (10.1016/0042-6989(83)90046-9_bib11) 1899 Marr (10.1016/0042-6989(83)90046-9_bib14) 1979; 69 Watt (10.1016/0042-6989(83)90046-9_bib20) 1982 Harris (10.1016/0042-6989(83)90046-9_bib10) 1964; 54 Westheimer (10.1016/0042-6989(83)90046-9_bib22) 1975; 14 Westheimer (10.1016/0042-6989(83)90046-9_bib21) 1972; Vol. VII 2 Barlow (10.1016/0042-6989(83)90046-9_bib2) 1979; 279 Marr (10.1016/0042-6989(83)90046-9_bib15) 1980; 70 Bracewell (10.1016/0042-6989(83)90046-9_bib4) 1978 Ditchburn (10.1016/0042-6989(83)90046-9_bib7) 1973 Watt (10.1016/0042-6989(83)90046-9_bib19) 1982; 22 Wilson (10.1016/0042-6989(83)90046-9_bib26) 1979; 19 Crick (10.1016/0042-6989(83)90046-9_bib6) 1981 Snyder (10.1016/0042-6989(83)90046-9_bib17) 1977; 17 Morgan (10.1016/0042-6989(83)90046-9_bib16) 1982; 22 Westheimer (10.1016/0042-6989(83)90046-9_bib23) 1977; 67 Barlow (10.1016/0042-6989(83)90046-9_bib3) 1981; 212 Westheimer (10.1016/0042-6989(83)90046-9_bib24) 1975; 15 Camphell (10.1016/0042-6989(83)90046-9_bib5) 1966; 196 Finney (10.1016/0042-6989(83)90046-9_bib8) 1971 Watt (10.1016/0042-6989(83)90046-9_bib18) 1981; 1 Marr (10.1016/0042-6989(83)90046-9_bib13) 1980; 207 Andrews (10.1016/0042-6989(83)90046-9_bib1) 1973; 13 Westheimer (10.1016/0042-6989(83)90046-9_bib25) 1977; 17 |
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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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