@incollection{Allison:1998yu,
	abstract = {Motion in depth can be elicited by dichoptically uncorrelated textures

R S Allison, I P Howard, A Howard

Opposed motion of the stereoscopic half-images of an object evokes a compelling percept of motion in depth. This percept could arise from positional disparity or from interocular differences in motion signals. Correlated dynamic random-dot stereograms have been used to dissociate position and motion disparity. We have taken a different approach using uncorrelated random-dot displays. The stimulus consisted of two random-dot displays, one just above a central fixation point and a second just below the fixation point. One of these served as the test image and the other as the comparison image. The test image was typically binocularly uncorrelated; the comparison image was correlated. The half-images of both displays oscillated horizontally in counterphase. The boundaries of each image were stationary, so that there were no moving deletion - accretion boundaries. Subjects adjusted the oscillation of the comparison display until its perceived velocity matched that of the test display. The effects of variation of dot density, dot lifetime, stimulus velocity, and oscillation frequency were studied. All subjects perceived strong apparent motion in depth in the uncorrelated display. Motion in depth was often accompanied by the appearance of sideways motion. No consistent impression of depth was obtained if the motion was stopped. Thus, dynamic depth can be created by changing disparity in a display with zero mean instantaneous disparity. We propose that the impression of motion in depth arises because of the consistent sign of changing disparity between randomly paired dots.

},
	author = {Allison, R.S. and Howard, I. P. and Howard, A.},
	booktitle = {Perception},
	date-added = {2011-05-06 17:11:50 -0400},
	date-modified = {2014-09-26 00:17:41 +0000},
	keywords = {Motion in depth},
	title = {Motion in depth can be elicited by dichoptically uncorrelated textures},
	url = {http://percept.eecs.yorku.ca/papers/ecvp 1998.pdf},
	url-1 = {http://percept.eecs.yorku.ca/papers/ecvp%201998.pdf},
	volume = {27},
	year = {1998},
	url-1 = {http://percept.eecs.yorku.ca/papers/ecvp%201998.pdf}}

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One of these served as the test image and the other as the comparison image. The test image was typically binocularly uncorrelated; the comparison image was correlated. The half-images of both displays oscillated horizontally in counterphase. The boundaries of each image were stationary, so that there were no moving deletion - accretion boundaries. Subjects adjusted the oscillation of the comparison display until its perceived velocity matched that of the test display. The effects of variation of dot density, dot lifetime, stimulus velocity, and oscillation frequency were studied. All subjects perceived strong apparent motion in depth in the uncorrelated display. Motion in depth was often accompanied by the appearance of sideways motion. No consistent impression of depth was obtained if the motion was stopped. Thus, dynamic depth can be created by changing disparity in a display with zero mean instantaneous disparity. We propose that the impression of motion in depth arises because of the consistent sign of changing disparity between randomly paired dots. 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Correlated dynamic random-dot stereograms have been used to dissociate position and motion disparity. We have taken a different approach using uncorrelated random-dot displays. The stimulus consisted of two random-dot displays, one just above a central fixation point and a second just below the fixation point. One of these served as the test image and the other as the comparison image. The test image was typically binocularly uncorrelated; the comparison image was correlated. The half-images of both displays oscillated horizontally in counterphase. The boundaries of each image were stationary, so that there were no moving deletion - accretion boundaries. Subjects adjusted the oscillation of the comparison display until its perceived velocity matched that of the test display. The effects of variation of dot density, dot lifetime, stimulus velocity, and oscillation frequency were studied. All subjects perceived strong apparent motion in depth in the uncorrelated display. 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