Assessing the effect of sound complexity on the audiotactile crossmodal dynamic capture task

Valeria Occelli, Charles Spence, Massimiliano Zampini
Poster
Last modified: 2008-05-13

Abstract


We examined the effect of varying the complexity of auditory stimuli (i.e., white noise vs. pure tone) on participants’ performance in the audiotactile crossmodal dynamic capture task. Participants had to discriminate the direction of a target streams (auditory in Experiment 1 and tactile in Experiment 2) while trying to ignore the direction of a distractor stream (tactile in Experiment 1 and auditory in Experiment 2). The distractor stream could be either spatiotemporally congruent or incongruent with the target stream. While the crossmodal dynamic capture exerted by tactile distractors was comparable for the two auditory target conditions (white noise vs. pure tone; Experiment 1), the crossmodal capture effect induced by the white noise stimuli was significantly larger than that induced by the pure tones (Exp.2). The fact that participants’ performance in Experiment 2 was affected by the nature of the auditory distractors is consistent with the assumption that audiotactile interactions occur predominantly for complex stimuli (cf. Graziano et al., 1999; Farnè & Ladavas, 2002). The difference in the results of the two experiments reported here further suggests that auditory streams are more adequate, regardless of the nature of the stimuli, for conveying dynamic information.

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