38.2: The Detection of Moving Features on a Display: The Interaction of Direction of Motion, Orientation, and Display Rate

Abstract

The contrast detection thresholds for Gabor patches, as a function of speed, oscillated by as much as a log unit when the motion was orthogonal to the orientation of the Gabor. Sensitivity was mediated by temporal frequency alone. Parallel motion, wide-band stimuli, and eye tracking allowed for higher sensitivity.

Intrasaccadic Perception

“…This phenomenon has been attributed to the fact that eye movements lower the retinal velocity of the stimulus, bringing it to a visible range. The explanation is supported by evidence that sensitivity during pursuit of drifting gratings equals sensitivity to static gratings under fixation (Murphy, 1978;Flipse et al, 1988;Peli et al, 1998). Thus, sensitivity is governed by retinal motion, not by motion within an external reference system.…”