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Spatiotemporal limitations on vernier and stereoscopic alignment acuity

Stereoscopic and monocular alignment acuity were measured using sinusoidal displacements in time, space, and disparity of a single line stimulus. The stereoscopic detectability was not limited by the sensitivity for the monocular components of the spatio-temporal stereo- alignment target. In fact, the two tasks seemed to be controlled by largely independent processes. Monocular sensitivity was best at high spatial perturbation frequencies, almost independent of temporal frequency, while stereoscopic sensitivity was best at low temporal and medium spatial frequencies, and its surface had a substantially different morphology. Under these dynamic conditions the lowest thresholds of either kind were of the order of 10 arc sec, setting stringent limitations on the accuracy of stereoscopic displays. The spatio- temporal surfaces we measured show regions where sensitivity is reduced by an order of magnitude, suggesting modes in which dynamic human stereopsis is more tolerant of perturbations than suggested by classical data.