Perception of three-dimensional angular rotation

Petersik, J. Timothy

doi:10.3758/bf03205063

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Further results supporting the hypothesis that perceived angular velocities are a function of the simulated angular velocities are provided by Petersik (1991). In three experiments, the subjects compared the angular velocities of two rotating spheres of random dots.…”

Section: Heuristic Derivation Of 3-d Angular Velocity From the First-supporting

confidence: 62%

“…On the average, however, a constant angular velocity was reported on more than 60% of the trials in which angular velocity varied while def was constant, and a variable angular velocity was reported on more than 75% of the trials in which angular velocity was constant while def varied. Within the present stimulus parameters, this argues for a primary effect of def on 3-D perceived angular velocity, rather than the simulated 3-D angular velocity as has been claimed previously (Kaiser & Calderone, 1991;Petersik, 1991).…”

Section: Discussionmentioning

confidence: 48%

“…Two principal findings summarize the data of Kaiser and Calderone (1991) and Petersik (1991): First, the angular velocities of two rotating spheres are correctly matched by the subjects, almost independently of the sizes of the spheres. Since the sizes are correlated with the 2-D velocities, it seems that the subjects' judgments are not influenced by the 2-D velocities.…”

Section: Heuristic Derivation Of 3-d Angular Velocity From the First-mentioning

confidence: 72%

“…In the previous research discussed above, the shapes used to study the perceived 3-D angular velocity were spheres (Kaiser & Calderone, 1991;Petersik, 1991). Dots in a spherical volume define an isotropic structure, since the points are spread with the same probability in all directions.…”

Section: Methodsmentioning

confidence: 99%

“…Stimuli similar to those of Kaiser and Calderone (1991) and Petersik (1991) were simulated under a perspective projection to determine their median def. Kaiser and Calderone and Petersik simulated the perspective projection of rotating random-dot spheres.…”

Section: Appendixmentioning

confidence: 99%

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Discriminating constant from variable angular velocities in structure from motion

Domini

Caudek²,

Turner

et al. 1998

Perception & Psychophysics

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We investigated accuracy in discriminating between constant and variable angular velocities for orthographic projections of three-dimensional rotating objects. The reported judgments of "constant" or "variable" angular velocity were only slightly influenced by the projected angular velocities, but they were greatly affected by the variations of the deformation, a first-order component of the optic flow. When viewing either a rotating ellipsoidal volume or a planar surface that accelerated and decelerated over the course of rotation, observers' tendencies to report a variable angular velocity were increased when the temporal phase of the acceleration pattern increased the range of variation of the median deformation; the tendencies were decreased when the same acceleration pattern was used to decrease the range of variation of the median deformation. These results provide evidence contrary to the hypothesis that the visual system performs a mathematically correct analysis of the optic flow.

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Section: Heuristic Derivation Of 3-d Angular Velocity From the First-supporting

confidence: 62%

Section: Discussionmentioning

confidence: 48%

Section: Heuristic Derivation Of 3-d Angular Velocity From the First-mentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

See 3 more Smart Citations

Discriminating constant from variable angular velocities in structure from motion

Domini

Caudek²,

Turner

et al. 1998

Perception & Psychophysics

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Functional properties of rotation-sensitive neurons in the posterior parietal association cortex of the monkey

et al. 1994

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We studied the functional properties of rotation-sensitive (RS) neurons of the posterior parietal association cortex in detail. We classified 58 neurons as RS neurons on the basis of statistical analysis, to indicate that their responses to rotary movement were significantly greater (P < 0.01) than those to linear movement of the same stimulus. We calculated rotation index, 1-(L/R), in 82 cells, where L/R is the ratio of net response to linear movement to that to rotary movement. All the RS neurons had rotation index greater than or equal to 0.3. The recording site of these RS neurons was localized in the posterolateral part of area PG (area 7a of Vogt), on the anterior bank of the caudal superior temporal sulcus (STS), in the region partly overlapping the medial superior temporal (MST) area. We compared the response of RS neurons to rotation with that to shearing movement as well as to linear movement. In the majority of RS neurons the ratio of shearing response to rotation response (S/R) was smaller than the ratio of linear response to rotation response (L/R), indicating that the response to rotation was not due to a simple combination of linear movements in the opposite direction. Most of the RS neurons responded to the rotary movement of a single spot as well as that of a slit, although the response was smaller (average 70%) for the former. Most of the RS neurons had large receptive fields (60-180 degrees in diameter) and their responses were independent of the position within the receptive field. The responses of most RS neurons increased monotonically with the increase in angular velocity and were also dependent on the size of the stimulus, although the rate of increase was small when the length was more than 10 degrees. The majority of RS neurons (37/58) responded better to rotation in depth than to that in the frontoparallel plane. Some of them (12/37) responded to diagonal rotation rather than to sagittal or horizontal rotation. We found that some depth RS neurons showed reversal in the preferred direction when we used a trapezoidal window-like plate as the rotating stimulus in the monocular viewing condition, just as occurs in the case of the Ames window illusion. The response of some RS neurons (5/7) was enhanced by tracking eye movement.(ABSTRACT TRUNCATED AT 400 WORDS)

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Metamerisms in Structure-from-motion Perception

Veen

Werkhoven²

1996

Vision Research

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As a three-dimensional object is moving through our world, we generally obtain a vivid impression of both its structure and its motion through space. The time-course of two-dimensional projections of the scene (optic flow) is important in conveying this three-dimensional information to us. The extent to which we can solve this specific inverse problem, i.e. infer a three-dimensional scene from two-dimensional flow, depends on the accuracy with which the required flow characteristics are processed by our visual system. In adequate two-dimensional processing can lead to incomplete representations of the three-dimensional world (three-dimensional metric information is lost). Then the motion and structure of objects can no longer be recovered uniquely. Consequently, metameric classes of three-dimensional representations arise (e.g. only affine properties are conserved). this study investigates under what conditions we find metameric combinations of the perceived attitude and perceived rotation of a plane. Our subjects are presented with stimuli consisting of two horizontally separated planar patches rotating back and forth in depth about vertical axes. Subjects are required to match both the attitude and the rotation magnitude of these two patches. We vary the attitude from 15 to 60 deg vertical slant, and the rotation magnitude from 28 to 98 deg. We find that the matched slant and rotation settings vary widely. For high slant values and for small rotations, attitude and rotation settings become highly correlated, suggesting metamery. For low slant values and for large rotations, the correlation almost disappears, suggesting that both quantities are estimated independently and uniquely. Our paradigm reveals that with one task and one type of stimulus a gradual transition occurs from unique settings (metric representations) to metameric classes of settings (e.g. affine representations).

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Perception of three-dimensional angular rotation

Cited by 8 publications

References 21 publications

Discriminating constant from variable angular velocities in structure from motion

Discriminating constant from variable angular velocities in structure from motion

Functional properties of rotation-sensitive neurons in the posterior parietal association cortex of the monkey

Metamerisms in Structure-from-motion Perception

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