Temporal ventriloquism refers to the shift in the perceived timing of a visual stimulus towards a transient auditory stimulus presented close in time. This effect is demonstrated by greater sensitivity of temporal order judgments of two visual stimuli when a sound is presented before the first visual stimulus and after the second visual stimulus. Recent studies suggest that temporal ventriloquism is affected by cross-modal correspondence between auditory pitch and visual elevation but not by correspondence between pitch and visual size. Here we examined the possibility that these results do not reflect a difference in the effects of different types of cross-modal correspondences on temporal ventriloquism but are rather mediated by shifts in visual-spatial attention triggered by preceding auditory stimuli. In Experiment 1, we replicated the results of previous studies that varied with the type of correspondence. Experiment 2 investigated the effects of the second audiovisual stimuli's asynchrony while the first audiovisual stimuli were synchronized. The results, unlike in Experiment 1, revealed that the magnitude of the temporal ventriloquism effect did not change with the congruency of pitch-elevation correspondence. Experiment 3 also indicated that the asynchrony of the first audiovisual stimuli modulated visual discrimination sensitivity irrespective of temporal ventriloquism. These results suggest that cross-modal correspondences do not affect temporal ventriloquism. Greater visual sensitivity when audiovisual stimuli are congruent with pitch-elevation correspondence may be attributable to shifts in visual attention caused by pitches of the preceding auditory stimulus, which speeds up detection of the first visual stimulus.
Cross-modal correspondences refer to associations between feature dimensions of stimuli across sensory modalities. Research has indicated that correspondence between audiovisual stimuli influences whether these stimuli are integrated or segregated. On the other hand, the audiovisual integration process plastically changes to compensate for continuously observed spatiotemporal conflicts between sensory modalities. If and how cross-modal correspondence modulates the “recalibration” of integration is unclear. We investigated whether cross-modal correspondence between auditory pitch and visual elevation affected audiovisual temporal recalibration. Participants judged the simultaneity of a pair of audiovisual stimuli after an adaptation phase in which alternating auditory and visual stimuli equally spaced in time were presented. In the adaptation phase, auditory pitch and visual elevation were manipulated to fix the order within each pairing of audiovisual stimuli congruent with pitch-elevation correspondence (visual leading or auditory leading). We found a shift in the point of subjective simultaneity (PSS) between congruent audiovisual stimuli as a function of the adaptation conditions (Experiment 1, 2), but this shift in the PSS was not observed within incongruent pairs (Experiment 2). These results indicate that asynchronies between audiovisual signals congruent with cross-modal correspondence are selectively recalibrated.
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