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Exp Brain Res. 2009 Sep;198(2-3):245-59. doi: 10.1007/s00221-009-1870-x. Epub 2009 Jun 5.

Audio-tactile superiority over visuo-tactile and audio-visual combinations in the temporal resolution of synchrony perception.

Author information

1
National Institute of Advanced Industrial Science and Technology, Higashi, Tsukuba, Ibaraki 305-8566, Japan. w-fujisaki@aist.go.jp

Abstract

To see whether there is a difference in temporal resolution of synchrony perception between audio-visual (AV), visuo-tactile (VT), and audio-tactile (AT) combinations, we compared synchrony-asynchrony discrimination thresholds of human participants. Visual and auditory stimuli were, respectively, a luminance-modulated Gaussian blob and an amplitude-modulated white noise. Tactile stimuli were mechanical vibrations presented to the index finger. All the stimuli were temporally modulated by either single pulses or repetitive-pulse trains. The results show that the temporal resolution of synchrony perception was similar for AV and VT (e.g., approximately 4 Hz for repetitive-pulse stimuli), but significantly higher for AT approximately 10 Hz). Apart from having a higher temporal resolution, however, AT synchrony perception was similar to AV synchrony perception in that participants could select matching features through attention, and a change in the matching-feature attribute had little effect on temporal resolution. The AT superiority in temporal resolution was indicated not only by synchrony-asynchrony discrimination but also by simultaneity judgments. Temporal order judgments were less affected by modality combination than the other two tasks.

PMID:
19499212
DOI:
10.1007/s00221-009-1870-x
[Indexed for MEDLINE]

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