AVSP 2003 - International Conference on Audio-Visual Speech Processing
September 4-7, 2003
This study investigated the "intersensory temporal synchrony window"  for audiovisual (AV) signals. A speeded asynchrony detection task was used to measure each participantís temporal synchrony window for speech and nonspeech signals over an 800-ms range of AV asynchronies. Across three sets of stimuli, the video-leading threshold for asynchrony detection was larger than the audio-leading threshold, replicating previous findings reported in the literature. Although the audio-leading threshold did not differ for any of the stimulus sets, the video-leading threshold was significantly larger for the point-light display (PLD) condition than for either the full-face (FF) or nonspeech (NS) conditions. In addition, a small but reliable phonotactic effect of visual intelligibility was found for the FF condition. High visual intelligibility words produced larger video-leading thresholds than low visual intelligibility words. Relationships with recent neurophysiological data on multisensory enhancement and convergence are discussed.
Bibliographic reference. Conrey, Brianna L. / Pisoni, David B. (2003): "Audiovisual asynchrony detection for speech and nonspeech signals", In AVSP 2003, 25-30.