ABSTRACT
Pantle, A., Papp, R., Reynolds, S., Cubells, O. and Gallogly, D. (in Press)
Viewer-centered temporal biasing of 3-D rotation percepts. Perception.
The perceived direction of rotation of a 3-D cloud of dots can be biased
by a prior rotation (Jiang, Pantle & Mark, 1998). In a series of experiments,
it is shown that the temporal rotation bias is reversed by a 180-deg change of
head orientation between two rotation sequences; i.e., the perceived direction
of rotation reverses for the second of two sequences when head orientation is
changed. The bias is, therefore, viewer-centered. Perceptual reversals are not
obtained when the orientation of the head is changed and returned to its
original position between rotation sequences. It was also found that the
viewer-centered bias combined additively with view-dependent, near-far
luminance information. Finally, the bias was manifest when 3-D depth was
re-established, but not maintained, between rotation sequences. A model, in
descriptive and flowchart forms, was used to explain the integration of
world-centered information and a viewer-centered temporal bias on the
presence/absence of perceptual reversals of the rotating visual sphere. In the
model the temporal bias is the result of the coupling of depth values to
persisting 2-D retinal motion signals.
Keywords: Structure-from-motion, 3-D rotation, apparent motion, temporal
biasing, priming, visual inertia
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