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Displacement detection in human vision
LEGGE, G E | CAMPBELL, F W
Vision Research. Vol. 21, no. 2, pp. 205-213. 1981
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 arcmin 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 arcmin in diameter. Displacement thresholds were
reduced by the presence of the annuli and were as low as 0.3
arcmin. This threshold reduction could not be fully attributed to
processes of relative spatial localization because displacement
thresholds were lower than spatial localization thresholds for
annulus diameters greater than 20 arcmin. 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.
 Descriptors: DISPLACEMENT | MOTION PERCEPTION | PSYCHOPHYSICS | TARGET
ACQUISITION | THRESHOLDS (PERCEPTION) | VISUAL ACUITY | ANNULI | LUMINANCE | ORIENTATION | PUPIL SIZE | SPACE PERCEPTION | VISUAL TASKS
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