Detection and Identification Contrast Sensitivity in Response to Complex Stationary and Moving Targets.

摘要

Five well-practiced observers set detection and identification contrast thresholds for Snellen-letter stimuli of different sizes (i.e., fundamental spatial frequencies) under the following conditions: moving (three velocities) vs. stationary, six rotations in the picture plane, and flickering (five temporal frequencies). The subjects contrast sensitivities for Snellen-letter stimuli were also compared to their contrast sensitivity functions (CSFs) for both static and moving sinusoidal gratings. In a final experiment, subjects adapted to stationary spatial-frequency gratings and set contrast thresholds for letter stimuli.