Sammendrag
To investigate rapid temporal recalibration, a simultaneity judgement task (SJ-task) was utilized. An audiovisual speech stimulus of the syllable /ba/, was presented with different amounts of audio and video lag, to examine how the previous trial affects the one coming after. The experimental data was split into three divisions. The study employed two cumulative Gaussian curves to examine how four dependent parameters; point of subjective simultaneity (PSS-average and PSS-cross), audio lead threshold (ALT) and video lead threshold (VLT), was affected by recalibration. Based on findings by Roseboom (2019) and Van der Burg et al. (2013), PSS-average, PSS-cross and VLT was expected to be dependent on the previous trial, while ALT was expected to be independent. The analyses found that PSS-average, ALT and VLT had significant differences across all three divisions, with an increase towards video lead. The analysis of PSS-cross did not find significant differences across the divisions, but showed approximately the same trend as PSSaverage. The resulting PSS-average and VLT were as expected, but ALT differed from expectations. An explanation for this might be that when hypothesizing the ALT it was not taken into consideration that (1) the method for fitting the curves might have a larger impact on ALT than PSS and VLT, and (2) in contrast to Roseboom (2019) and Van der Burg et al. (2013) the prior trials were grouped into three divisions, not two. Future research utilizing cumulative Gaussian curves is recommended to apply ALT and VLT together with PSS to build a stronger case for which measure of synchrony perception is preferable. Another suggestion is to examine how not only the previous trial affects the current, but also trials prior to the previous one to better understand how recalibration works and follow up on the findings by Van der Burg et al. (2013).