Visual coherence of moving and stationary image changes.
Detection thresholds were compared for moving and stationary oscillations with equivalent contrast changes. Motion was more detectable than stationary oscillation, and the difference increased with size of the feature (a Gaussian blob). Phase discriminations between a center and two flanking features were much better for motion than for stationary oscillation. Motion phase discriminations were similar to motion detection and were robust over increases in spatial separation and temporal frequency, but not so for stationary oscillations. Separate visual motion signals were positively correlated, but visual signals for stationary oscillation were negatively correlated. Evidently, motion produces visually coherent changes in image structure, but stationary contrast oscillation does not.
Lappin
Joseph S
JS
Department of Psychology, Vanderbilt Vision Research Center, Vanderbilt University, 301 Wilson Hall, 111, 21st Avenue South, Nashville, TN 37240-0009, USA. jow.lappi@vanderbilt.edu
Tadin
Duje
D
Whittier
Eric J
EJ
D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D011601:Psychophysics; D014792:Visual Acuity / Q000502:physiology