Mislocalization of diplopic images.

When observers dichoptically view bar stimuli at disparities beyond the fusion limit, the bars are perceived as being closer together than they really are. When 6.0-cycle/deg vertical derivative-of-Gaussian bars are adjusted into apparent alignment with binocularly presented spots, the mislocalization of each bar's half-image is typically 2-5 arcmin for disparities below 60 arcmin. The effect does not generalize to an additional monocular probe bar at more-eccentric locations, thus excluding reflex vergence eye movements as an explanation. Instead, the results indicate a process of interocular matching that seeks to attribute similar directions as well as depths to matching half-images.

[1]  C. Wheatstone.  XVIII. Contributions to the physiology of vision. —Part the first. On some remarkable, and hitherto unobserved, phenomena of binocular vision , 1962, Philosophical Transactions of the Royal Society of London.

[2]  D. Snodderly,et al.  Studying striate cortex neurons in behaving monkeys: Benefits of image stabilization , 1987, Vision Research.

[3]  R Blake,et al.  Disparity range for binocular summation. , 1988, Investigative ophthalmology & visual science.

[4]  Hugh R. Wilson,et al.  Contrast matching data predicted from contrast increment thresholds , 1984, Vision Research.

[5]  A L Duwaer.  Nonmotor component of fusional response to vertical disparity: a second look using an afterimage method. , 1982, Journal of the Optical Society of America.

[6]  S. Anstis.  The perception of apparent movement. , 1980, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[7]  O J Braddick,et al.  Low-level and high-level processes in apparent motion. , 1980, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[8]  H. Hughes,et al.  Spatial maps of directed visual attention. , 1985, Journal of experimental psychology. Human perception and performance.

[9]  G Westheimer,et al.  Panum’s phenomenon and the confluence of signals from the two eyes in stereoscopy , 1986, Proceedings of the Royal Society of London. Series B. Biological Sciences.

[10]  G. Westheimer,et al.  Spatial location and hyperacuity: The centre/surround localization contribution function has two substrates , 1985, Vision Research.

[11]  G. Westheimer,et al.  Disjunctive eye movements , 1961, The Journal of physiology.

[12]  J. Mayhew,et al.  Vergence Eye Movements Made in Response to Spatial-Frequency-Filtered Random-Dot Stereograms , 1981, Perception.

[13]  H. Ono,et al.  On Wells’s (1792) law of visual direction , 1981, Perception & psychophysics.

[14]  C. A. Marzi,et al.  Distribution in the visual field of the costs of voluntarily allocated attention and of the inhibitory after-effects of covert orienting , 1987, Neuropsychologia.

[15]  R. Desimone,et al.  Selective attention gates visual processing in the extrastriate cortex. , 1985, Science.

[16]  G. Westheimer,et al.  Depth attraction and repulsion of disparate foveal stimuli , 1987, Vision Research.

[17]  B. Julesz,et al.  Extension of Panum's fusional area in binocularly stabilized vision. , 1967, Journal of the Optical Society of America.

[18]  J. Hoffman,et al.  Spatial attention in vision , 1986, Psychological research.

[19]  G Westheimer,et al.  The sensory stimulus for disjunctive eye movements. , 1969, Vision research.

[20]  H. Hughes,et al.  Natural boundaries for the spatial spread of directed visual attention , 1987, Neuropsychologia.

[21]  James E. Sheedy,et al.  The perceived direction of the binocular image , 1979, Vision Research.

[22]  Kvetsolav Prazdny,et al.  Vertical disparity tolerance in random-dot stereograms , 1985 .

[23]  W Richards,et al.  Local versus global stereopsis: two mechanisms? , 1974, Vision research.

[24]  D. Mitchell.  Qualitative depth localization with diplopic images of dissimilar shape. , 1969, Vision research.

[25]  G. van den Brink,et al.  Detection of vertical disparities , 1982, Vision Research.