Recalibration of audiovisual simultaneity in speech

Recent studies have shown that the audio-visual synchrony is recalibrated after adaptation to a constant timing difference between auditory and visual signals (i.e. temporal recalibration). Here we investigated whether the temporal recalibration occurs for audio-visual speech using an off-line adaptation method. After 3 minutes of lag observation, the audio-visual synchrony is recalibrated toward the adapted lag. The point of subjective simultaneity shifted after 10 seconds of lag observation, whereas the just noticeable difference did not change during this short observation period. The width of the temporal window extended only to the direction of audio delay. These findings extend the findings in previous studies and suggest different properties of temporal recalibration in speech.