Binocular correlates of the direction of motion in depth.
Two binocular cues to the direction of an object's motion in depth are the ratio (phi R/phi L) between the velocities of the object's retinal images in the right and left eyes and the ratio (phi/gamma) between the velocity of the binocularly-fused image of the object and the rate of change of disparity. We report that the apparent direction of motion in depth of a monocularly-camouflaged target can be varied by altering the ratio phi/gamma. Because no monocular motion signal is available in this case, we conclude that the ratio phi/gamma is a sufficient cue to the direction of motion in depth. This is not to deny that the phi R/phi L cue might be used in the everyday visual situation where monocular velocities phi R and phi L are available to the brain.
Regan
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Department of Psychology, BSB, York University, North York, Ontario, Canada.
D003463:Cues; D003867:Depth Perception / Q000502:physiology; D006801:Humans; D008433:Mathematics; D009039:Motion Perception / Q000502:physiology*; D013997:Time Factors; D015348:Vision, Binocular / Q000502:physiology*