Crossmodal duration perception involves perceptual grouping, temporal ventriloquism, and variable internal clock rates.
Here, we investigate how audiovisual context affects perceived event duration with experiments in which observers reported which of two stimuli they perceived as longer. Target events were visual and/or auditory and could be accompanied by nontargets in the other modality. Our results demonstrate that the temporal information conveyed by irrelevant sounds is automatically used when the brain estimates visual durations but that irrelevant visual information does not affect perceived auditory duration (Experiment 1). We further show that auditory influences on subjective visual durations occur only when the temporal characteristics of the stimuli promote perceptual grouping (Experiments 1 and 2). Placed in the context of scalar expectancy theory of time perception, our third and fourth experiments have the implication that audiovisual context can lead both to changes in the rate of an internal clock and to temporal ventriloquism-like effects on perceived on- and offsets. Finally, intramodal grouping of auditory stimuli diminished any crossmodal effects, suggesting a strong preference for intramodal over crossmodal perceptual grouping (Experiment 5).
Helmholtz Institute & Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands. P.C.Klink@uu.nl
P Christiaan
PC
Klink
Jorrit S
JS
Montijn
Richard J A
RJ
van Wezel
D000328:Adult; D001244:Association; D001288:Attention; D003657:Decision Making; D004056:Differential Threshold; D005260:Female; D006801:Humans; D007600:Judgment; D008297:Male; D010364:Pattern Recognition, Visual; D010469:Perceptual Distortion; D010898:Pitch Perception; D011601:Psychophysics; D013998:Time Perception; D055815:Young Adult
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