The effect of sound intensity on the audiotactile crossmodal dynamic capture effect |
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Authors: | Valeria Occelli Charles Spence and Massimiliano Zampini |
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Institution: | (1) Department of Cognitive Sciences and Education, University of Trento, Corso Bettini, 31, 38068 Rovereto (TN), Italy;(2) Department of Experimental Psychology, Crossmodal Research Laboratory, Oxford University, Oxford, UK;(3) Center for Mind/Brain Sciences, University of Trento, Rovereto (TN), Italy |
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Abstract: | We investigated the effect of varying sound intensity on the audiotactile crossmodal dynamic capture effect. Participants
had to discriminate the direction of a target stream (tactile, Experiment 1; auditory, Experiment 2) while trying to ignore
the direction of a distractor stream presented in a different modality (auditory, Experiment 1; tactile, Experiment 2). The
distractor streams could either be spatiotemporally congruent or incongruent with respect to the target stream. In half of
the trials, the participants were presented with auditory stimuli at 75 dB(A) while in the other half of the trials they were
presented with auditory stimuli at 82 dB(A). Participants’ performance on both tasks was significantly affected by the intensity
of the sounds. Namely, the crossmodal capture of tactile motion by audition was stronger with the more intense (vs. less intense)
auditory distractors (Experiment 1), whereas the capture effect exerted by the tactile distractors was stronger for less intense
(than for more intense) auditory targets (Experiment 2). The crossmodal dynamic capture was larger in Experiment 1 than in
Experiment 2, with a stronger congruency effect when the target streams were presented in the tactile (vs. auditory) modality.
Two explanations are put forward to account for these results: an attentional biasing toward the more intense auditory stimuli,
and a modulation induced by the relative perceptual weight of, respectively, the auditory and the tactile signals.
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Keywords: | Touch Audition Multisensory Sound intensity Crossmodal dynamic capture |
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