Assessing the audiotactile Colavita effect in near and rear space |
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Authors: | Valeria Occelli Jess Hartcher O’Brien Charles Spence Massimiliano Zampini |
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Institution: | (1) Center for Mind/Brain Sciences, University of Trento, Corso Bettini, 31, 38068 Rovereto, TN, Italy;(2) Crossmodal Research Laboratory, Department of Experimental Psychology, Oxford University, Oxford, UK;(3) Department of Cognitive Sciences and Education, University of Trento, Rovereto, TN, Italy |
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Abstract: | The Colavita effect occurs when participants performing a speeded detection/discrimination task preferentially report the
visual component of pairs of audiovisual or visuotactile stimuli. To date, however, researchers have failed to demonstrate
an analogous effect for audiotactile stimuli (Hecht and Reiner in Exp Brain Res 193:307–314, 2009). Here, we investigate whether an audiotactile Colavita effect can be demonstrated by manipulating either the physical features
of the auditory stimuli presented in frontal (Experiment 1) or rear space (Experiment 3), or the relative and absolute position
of auditory and tactile stimuli in frontal (Experiment 2) or rear space (Experiment 3). The participants showed no evidence
of responding preferentially to one of the sensory components of the bimodal stimuli when they were presented from a single
location in frontal space (Experiment 1). However, a significant audiotactile Colavita effect was demonstrated in Experiments
2 and 3, with participants preferentially reporting the auditory (rather than tactile) stimulus on the bimodal target trials.
In Experiment 3, an audiotactile Colavita effect was reported for auditory white noise bursts but not for pure tones and selectively
for those stimuli presented from the same (rather than from the opposite) side. Taken together, these results therefore suggest
that when a tactile and an auditory stimulus are presented from a single frontal location, participants do not preferentially
report one of the two sensory components (Experiment 1). In contrast, when the stimuli are presented from different locations,
people preferentially report the auditory component, especially when they are spatially coincident (Experiments 2 and 3).
Moreover, for stimuli presented from rear space, the Colavita effect was only observed for auditory stimuli consisting of
white noise bursts (but not for pure tones), suggesting that this kind of stimuli are more likely to be bound together with
somatosensory stimuli in rear space. |
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