Cite as:
Kham K, Chung C, Oh C, 2000, "Does motion information interact with binocular disparity in object segmentation?" Perception 29 ECVP Abstract Supplement

Does motion information interact with binocular disparity in object segmentation?

K Kham, C Chung, C Oh

Considerable amounts of recent evidence suggest that binocular disparity and motion information are combined during such visual processing as structure-from-motion and computation of depth.

An assumption about the common function of these two types of information is that they serve to segment objects from their background. On the basis of this assumption, we investigated whether motion direction interacts with binocular disparity in the process of object segmentation, using a subthreshold summation method. First, we measured subjects' thresholds to discriminate vertical and horizontal rectangles defined by common direction or common binocular disparity alone in a random-dot display. Then, we measured threshold to discriminate the target in a compounding stimulus defined by both binocular disparity and motion direction.

The result shows that the threshold for the compounding stimulus is lower than that for the stimulus defined by each cue alone. However, such decrease in threshold fell short of allowing us to reject the prediction of the probability summation, suggesting that motion and disparity information may be independently processed, at least at the stage of object segmentation.

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