Crespi S, Bruno A, Melcher D, 2003, "Temporal integration for motion in central and peripheral view" Perception 32 ECVP Abstract Supplement
Temporal integration for motion in central and peripheral view
S Crespi, A Bruno, D Melcher
Motion integrates over time, allowing even a weak signal in noise to be perceived given a long enough presentation. Temporal integration of motion, as measured by coherence thresholds, involves summation times greater than 1 s. Previous studies of motion integration have utilised relatively large motion stimuli. Some types of motion processing, however, show differences between centre and periphery. We tested whether the duration of temporal integration of translational motion is equivalent for centrally and peripherally viewed targets. The stimulus contained motion signals (limited lifetime of two frames) embedded in 4 s random noise, with stimuli viewed either centrally (3.5 deg circle) or peripherally (4 - 6 deg or 8 - 12 deg annulus). Direction discrimination was measured and coherence sensitivity determined for motion signals of varying durations (70 - 3500 ms). Linear integration of motion was found, with summation times ranging from 1 s to 2 s for all subjects and eccentricities. This similarity in integration times for varying eccentricities differs, however, from performance in which two separate motion signals are shown and the temporal delay between the two motion signals is varied.
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