Temporal recalibration involves adaptation at two time scales D Alais1, J Cass2, E Van der Burg1 |
|---|
1School of Psychology, University of Sydney, Australia |
| We investigate the time constant of recovery from adaptation to temporal asynchrony. Subjects adapted to a 4 min naturalistic animation with strong audiovisual temporal cues. The soundtrack was asynchronous by either +/- 200 ms. For 2 min postadaptation, we sampled synchrony perception every 2 s with a flash/beep stimulus that varied over several ±SOAs. Binning synchrony responses within a short, rolling time window we estimated the PSS during recovery from temporal adaptation. Rolling average PSSs showed significant recalibration initially followed by a recovery function, with PSSs returning to baseline after ~60 s. We also analysed short-time scale recalibration by testing for adaptation effects between successive synchrony probes. Although these probes were brief (60 ms), we found that a given synchrony judgment during postadaptation was strongly influenced by the previous synchrony probe’s sign, showing adaptation in the direction of the preceding probe’s SOA. Together, these results show long- and short-scale temporal recalibration, with the short-scale inter-probe effects superimposed on long-scale recalibration. In a second experiment, we delayed the synchrony probes for 60 s postadaptation and observed no long-scale recalibration, showing there is no storage of long-scale temporal adaptation. |
| Up Home |
|---|