TY - JOUR
T1 - Binocular processing of motion
T2 - Some unresolved questions
AU - Regan, David
AU - Gray, Robert
N1 - Funding Information:
by the National Science Foundation Faculty Early Career Development Programme (Award #0239657 to author R. G.)
Funding Information:
We thank Hiro Ono, Ian Howard and Laurie Wilcox for comments on an earlier version of this MS. This research was supported by the National Sciences and Engineering Research Council of Canada (NSERC operating grant go author D. R.) and
PY - 2009/1/1
Y1 - 2009/1/1
N2 - The unresolved questions relating to binocular processing of motion include: Is the perceived speed of the motion in depth (MID) of an approaching object inversely proportional to the time to collision?; What visual information supports judgements of the direction of MID?; What is the relation between binocular and monocular processing in the perception of MID? We review whether the perception of stereomotion in depth of a monocularly visible object is caused entirely by a rate of change of disparity, and conclude that the difference between the horizontal velocities of the object's left and right retinal images makes at most only a small contribution to speed discrimination, but conclusions may be different for detection, perceived speed and directional discrimination. We review laboratory evidence on the relative importance of binocular and monocular information for interceptive action and collision avoidance and conclude that, in addition to the effect of considerable intersubject variability, the relative importance depends on the physical size of the approaching object, its distance and, if nonspherical, its direction of motion and whether it is rotating. We compare attempts to find whether the human visual system contains a mechanism specialized for the speed of cyclopean motion within a frontoparallel plane, and find the question ill-posed.
AB - The unresolved questions relating to binocular processing of motion include: Is the perceived speed of the motion in depth (MID) of an approaching object inversely proportional to the time to collision?; What visual information supports judgements of the direction of MID?; What is the relation between binocular and monocular processing in the perception of MID? We review whether the perception of stereomotion in depth of a monocularly visible object is caused entirely by a rate of change of disparity, and conclude that the difference between the horizontal velocities of the object's left and right retinal images makes at most only a small contribution to speed discrimination, but conclusions may be different for detection, perceived speed and directional discrimination. We review laboratory evidence on the relative importance of binocular and monocular information for interceptive action and collision avoidance and conclude that, in addition to the effect of considerable intersubject variability, the relative importance depends on the physical size of the approaching object, its distance and, if nonspherical, its direction of motion and whether it is rotating. We compare attempts to find whether the human visual system contains a mechanism specialized for the speed of cyclopean motion within a frontoparallel plane, and find the question ill-posed.
KW - Binocular VISION
KW - MOTION
KW - STEREOMOTION
KW - Stereopsis
KW - VISUALLY-GUIDED ACTION
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U2 - 10.1163/156856809786618501
DO - 10.1163/156856809786618501
M3 - Article
C2 - 19055886
AN - SCOPUS:65849243509
SN - 0169-1015
VL - 22
SP - 1
EP - 43
JO - Spatial Vision
JF - Spatial Vision
IS - 1
ER -