Displacement detection in human vision
The displacement threshold is defined to be the smallest instantaneous target displacement that can be detected. Properties of the displacement threshold for a small, luminous spot were measured psychophysically. In a structureless field, the displacement threshold was near 1.5′, subject to individu...
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Published in | Vision research (Oxford) Vol. 21; no. 2; pp. 205 - 213 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
England
Elsevier Ltd
1981
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Subjects | |
Online Access | Get full text |
ISSN | 0042-6989 1878-5646 |
DOI | 10.1016/0042-6989(81)90114-0 |
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Summary: | The
displacement threshold is defined to be the smallest instantaneous target displacement that can be detected. Properties of the displacement threshold for a small, luminous spot were measured
psychophysically. In a structureless field, the displacement threshold was near 1.5′, subject to individual variation. The effects of
pattern were studied by measuring displacement thresholds at the centers of a set of annuli ranging from 2.85′–728′ dia. Displacement thresholds were reduced by the presence of the annuli and were as low as 0.3′. This threshold reduction could not be fully attributed to processes of
relative spatial localization because displacement thresholds were lower than spatial localization (bull'seye) thresholds for annulus diameters greater than 20′. The displacement threshold is virtually independent of orientation and pupil size. It increased about 75% with a three log unit decrease in photopic target
luminance. Displacement detection appears to depend upon the motion sense rather than the position sense. It may be limited by fixation accuracy. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0042-6989 1878-5646 |
DOI: | 10.1016/0042-6989(81)90114-0 |