INTEGRATION OF BINOCULAR STEREOPSIS AND STRUCTURE-FROM-MOTION IN THE DISCRIMINATION OF NOISY SURFACES

Integration of stereo and motion information was measured on the basis of observers' ability to discriminate between triangle-and sine wave corrugated surfaces or sinusoidal surfaces of different spatial freque ncy. Discrimination performance for the triangle-sine task was consist ent with independent processing of motion and stereo, but the spatial frequency discrimination task led to performance superior to that pred icted by an independent combination of motion and stereo signals, indi cating that the integration of stereo and motion depends on the type o f 3-dimensional structure observers are required to discriminate. This pattern of results is consistent with the existence of multiple stere oscopic mechanisms suggested by psychophysical and neurophysiological data.