Perceived timing of vestibular stimulation relative to touch, light and sound
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Different senses have different processing times. Here we measured the perceived timing of galvanic vestibular stimulation (GVS) relative to tactile, visual and auditory stimuli. Simple reaction times for perceived head movement (438 ± 49 ms) were significantly longer than to touches (245 ± 14 ms), lights (220 ± 13 ms), or sounds (197 ± 13 ms). Temporal order and simultaneity judgments both indicated that GVS had to occur about 160 ms before other stimuli to be perceived as simultaneous with them. This lead was significantly less than the relative timing predicted by reaction time differences compatible with an incomplete tendency to compensate for differences in processing times.
KeywordsAudition Galvanic vestibular stimulation Multisensory Simultaneity judgments Temporal order judgments Touch Vestibular Vision
This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). M. Barnett-Cowan was supported by a PGS-D3 NSERC Scholarship and a Canadian Institutes of Health Research Vision Health Science Training Grant. Our thanks go to Michael Jenkin for technical assistance, to Jeff Sanderson who helped conduct experiments and to David Shore for comments on this project.
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