Monocular discrimination of the direction of motion in depth.

摘要: Abstract The direction of motion in depth a monocularly-viewed rigid sphere can be quantified terms the distance by which sphere's centre will miss pupil observing eye. If we express this as ns (where s is radius and n scaling factor), then approximates ratio (d Φ /d t )(d θ ) between translational velocity rate expansion object's retinal image. To use monocular information alone basis for motor action, prior knowledge 5 would necessary. (However, value available from binocular information, so that die eye is, principle, image and, particular, without knowing size or eye.) We measured just-discriminable difference simulated object. Thresholds were trajectories contained within horizontal, vertical two oblique mendia. speed was removed reliable cue to randomly varying on trial basis. also cue. Discrimination threshold ranged 0.03 0.12 deg our seven subjects, did not vary appreciably with relative Une sight over range investigated, nor it depend whether trajectory meridia. conclude subjects are able monocidarly discriminate differences depth, even when both translation cues.