The use of occlusion to resolve ambiguity in parallel projections

Previous research has shown that the three-dimensional structure of an object usually can be perceived when viewing a parallel projection of the object rotating in depth. Accurate judgments of direction of rotation, however, have been found only with polar projections. The present study demonstrated that accurate direction judgments can occur with parallel projections if occlusion is included in the displays. The stimuli were parallel projections of pentagonal texture elements on the surface of a rotating sphere. In one condition, the elements were occluded as they rounded the edge of an opaque sphere. In another condition, elements on the far surface of a transparent sphere were occluded by elements on the near surface. Accuracy of direction judgments was consistently high in the first condition and increased monotonically with element size in the second condition, from chance to over 80% correct. The relationship of these results to the general issue of perceptually combining structure in depth information from one source with relative distance information from another source is discussed.

[1]  J T Petersik,et al.  Three-dimensional object constancy: Coherence of a simulated rotating sphere in noise , 1979, Perception & psychophysics.

[2]  J Dichgans,et al.  Visual-vestibular interaction and motion perception. , 1972, Bibliotheca ophthalmologica : supplementa ad ophthalmologica.

[3]  J T Petersik,et al.  Rotation judgments and depth judgments: Separate or dependent processes? , 1980, Perception & psychophysics.

[4]  M L Braunstein,et al.  Minimal conditions for the perception of rotary motion. , 1977, Scandinavian journal of psychology.

[5]  Myron L. Braunstein,et al.  Depth perception through motion , 1976 .

[6]  George A. Kaplan,et al.  Kinetic disruption of optical texture: The perception of depth at an edge , 1969 .

[7]  M. Braunstein,et al.  Velocity gradients and relative depth perception , 1981, Perception & psychophysics.

[8]  W. Gogel,et al.  The organization of perceived space , 1973, Psychologische Forschung.

[9]  J. Gibson,et al.  The change from visible to invisible: , 1969 .

[10]  S. Ullman.  The Interpretation of Visual Motion , 1979 .

[11]  J. Gibson.  Optical motions and transformations as stimuli for visual perception. , 1957, Psychological review.

[12]  B Rogers,et al.  Motion Parallax as an Independent Cue for Depth Perception , 1979, Perception.

[13]  M L Braunstein,et al.  Sensitivity of the observer to transformations of the visual field. , 1966, Journal of experimental psychology.

[14]  J. W. Rhodes,et al.  The Effect of Multiple Depth Cues in the Perception of Occlusion , 1980 .

[15]  M L Braunstein,et al.  Perspective and the rotating trapezoid. , 1968, Journal of the Optical Society of America.

[16]  J. Gibson.  The Ecological Approach to Visual Perception , 1979 .

[17]  J. Yellott,et al.  Depth Inversion despite Stereopsis: The Appearance of Random-Dot Stereograms on Surfaces Seen in Reverse Perspective , 1979, Perception.

[18]  M. Braunstein.  Perceived direction of rotation of simulated three-dimensional patterns , 1977 .

[19]  J. T. Petersik,et al.  The Effects of Spatial and Temporal Factors on the Perception of Stroboscopic Rotation Simulations , 1980, Perception.