The effect of rapid temporal recalibration on the perceived simultaneity for audio-visual speech perception

Abstract

Research indicates that rapid temporal recalibration can occur after single exposure and that the largest effect on this process comes from video-lead stimuli. This study examined how single exposure from various SOA-1 affected the perceived simultaneity for speech perception. Participants performed a simultaneity judgement task (SJ-task) with the syllable /ba/ adjusted across 21 different SOA levels as audio-visual stimuli. Arguments from previous research promotes an alternative way to represent the results from SJ-tasks. Instead of a traditional gaussian curve the current study calculated results using two fitted sigmoid curves. ALT and VLT are presented as independent parameters as an alternative to PSS. An attempt to calculate a more independent PSS value (PSScross) has also been made. Four repeated measures analysis of variance (ANOVA) showed that rapid recalibration occurred after exposure to SOA-1, and the results additionally indicated a heightened effect after exposure to video-lead stimuli compared to audio-lead.