Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6203282 | Vision Research | 2014 | 7 Pages |
â¢20 Hz temporal frequency adaptation reduces magnitude of the Flash-Lag illusion.â¢This reduction cannot be explained by change in perceived speed alone.â¢Therefore, 20 Hz adaptation compresses the time component of Flash-Lag.â¢We conclude duration affects visual processes reliant on space-time calculations.
Previous research finds that 20Â Hz temporal frequency (TF) adaptation causes a compression of perceived visual event duration. We investigate if this temporal compression affects further time-dependent percepts, implying a further functional role for duration perception mechanisms. We measure the effect of 20Â Hz flicker adaptation on Flash-Lag, an illusion whereby an observer perceives a moving object displaced further along its trajectory compared to a spatially localized briefly flashed object. The illusion scales with object speed; therefore, it has a fixed temporal component. By comparing adaptation at 5Â Hz and 20Â Hz we show that 20Â Hz TF adaptation reduces perceived Flash-Lag magnitude significantly, with no effect at 5Â Hz, whereas the opposite pattern of adaptation was seen on perceived speed. There is a significant effect of 20Â Hz adaptation on the perceived duration of a moving bar. This suggests that 20Â Hz TF adaptation has compressed the fixed temporal component of the Flash-Lag illusion, implying the mechanism underlying duration perception also has effects on judging spatial relationships in dynamic stimuli.