Cyclopean motion perception produced by Oscillations of size, disparity and location

UNLABELLED For cyclopean and monocularly-visible targets we measured psychophysical thresholds for perceptions produced by the following three stimuli: oscillations of disparity (DO), oscillations of size (SO) and oscillatory motion within the frontoparallel plane (FPO). RESULTS thresholds for motion in depth perception produced by DO were similar for cyclopean and non-cyclopean targets over the entire 0.25-8 Hz frequency range investigated. Thresholds for perceiving motion in depth produced by SO were considerably (up to 2.5 times) higher for cyclopean targets than for monocularly-visible targets, as were thresholds for perceiving size oscillations. For both cyclopean and monocularly-visible target the perception of motion in depth could be canceled by pitting DO vs SO. Thresholds for perceiving FPO were similar to DO thresholds for the monocularly-visible target, but for the cyclopean targets FPO thresholds rose more steeply than DO thresholds for oscillation frequencies above 1 Hz. CONCLUSIONS (1) for our subjects, the effective binocular stimulus for motion in depth perception is a rate of change of disparity; an interocular velocity difference is significant only to the extent that it produces a rate of change of disparity. (2) The sensations of motion in depth produced by DO and SO are qualitatively identical. (3) Neural signals produced by DO and SO converge onto a single neural mechanism that signals motion in depth.

[1]  C. William Tyler,et al.  Characteristics of stereomovement suppression , 1975 .

[2]  H. Collewijn,et al.  Eye movements and stereopsis during dichoptic viewing of moving random-dot stereograms , 1985, Vision Research.

[3]  B. G. Cumming,et al.  Binocular mechanisms for detecting motion-in-depth , 1994, Vision Research.

[4]  D. Regan,et al.  Figure-ground segregation by motion contrast and by luminance contrast. , 1984, Journal of the Optical Society of America. A, Optics and image science.

[5]  D. Regan,et al.  Evidence for the existence of neural mechanisms selectively sensitive to the direction of movement in space , 1973, The Journal of physiology.

[6]  D. Regan,et al.  Necessary conditions for the perception of motion in depth. , 1986, Investigative ophthalmology & visual science.

[7]  J. Gaddum.  Probit Analysis , 1948, Nature.

[8]  D Regan,et al.  The relation between discrimination and sensitivity in the perception of motion in depth. , 1975, The Journal of physiology.

[9]  B. Julesz,et al.  Differences between monocular and binocular stroboscopic movement perception. , 1968, Vision research.

[10]  D. Regan,et al.  Human brain electrophysiology , 1989 .

[11]  H. Collewijn,et al.  Motion perception during dichoptic viewing of moving random-dot stereograms , 1985, Vision Research.

[12]  D. Regan,et al.  Illusory motion in depth: Aftereffect of adaptation to changing size , 1978, Vision Research.

[13]  D Regan,et al.  Some dynamic features of depth perception. , 1973, Vision research.

[14]  D. Regan,et al.  Texture changes versus size changes as stimuli for motion in depth , 1983, Vision Research.

[15]  Eileen Kowler.  Eye movements and their role in visual and cognitive processes. , 1990, Reviews of oculomotor research.

[16]  C. Tyler,et al.  Frequency response characteristics for sinusoidal movement in the fovea and periphery , 1972 .

[17]  Whitman Richards,et al.  Response functions for sine- and square-wave modulations of disparity. , 1972 .

[18]  Christopher Bowd,et al.  Properties of the stereoscopic (Cyclopean) motion aftereffect , 1994, Vision Research.

[19]  H. Levitt.  Transformed up-down methods in psychoacoustics. , 1971, The Journal of the Acoustical Society of America.

[20]  H Collewijn,et al.  Binocular eye movements and the perception of depth. , 1990, Reviews of oculomotor research.

[21]  D. Regan,et al.  Looming detectors in the human visual pathway , 1978, Vision Research.

[22]  D. Regan,et al.  Binocular and monocular stimuli for motion in depth: Changing-disparity and changing-size feed the same motion-in-depth stage , 1979, Vision Research.

[23]  Charles Wheatstone,et al.  Contributions to the Physiology of Vision. , 1837 .

[24]  A. Norcia,et al.  Temporal frequency limits for stereoscopic apparent motion processes , 1984, Vision Research.

[25]  Charles Wheatstone,et al.  I. The Bakerian Lecture.— Contributions to the physiology of vision.— Part the second. On some remarkable, and hitherto unobserved, phenomena of binocular vision (continued) , 1852, Philosophical Transactions of the Royal Society of London.

[26]  B. Julesz.  Foundations of Cyclopean Perception , 1971 .

[27]  Robert Patterson,et al.  Properties of cyclopean motion perception , 1992, Vision Research.