Champion R A, Mamassian P, Simmons D R, 2002, "The promotion of stereo by motion" Perception 31 ECVP Abstract Supplement
The promotion of stereo by motion
R A Champion, P Mamassian, D R Simmons
Models of depth-cue combination have proposed that independent depth modules may interact prior to combination to specify unknown parameters (Landy et al, 1995 Vision Research 35 389 - 412). For example, motion parallax and binocular disparities could interact to recalibrate the viewing distance, overcoming the stereo distance scaling problem. We investigated whether, following presentation of both cues, the influence of motion on stereo-defined shape would persist when the motion was removed.
Stimuli were horizontally oriented elliptical hemicylinders, defined by stereo alone (static), or stereo plus motion about a vertical axis (moving). Stimuli were presented with various depths, and observers judged whether the depth was greater or less than the half-height. The point of subjective equality (PSE) was the depth perceived equal to the half-height. Experiment 1 consisted of three successive blocks of 280 trials: static, moving, static. The PSE in the second static block differed from the one in the first block and became more consistent with the PSE in the moving block. In experiment 2, moving and static stimuli were interleaved within a single session (672 trials). For several observers, the PSEs for static and moving conditions converged as the session progressed. We conclude that motion does influence perceived shape from stereo even after the motion is removed. This suggests the promotion of stereo by motion prior to combination of these cues.[R A Champion is supported by an ESRC
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