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An Exploration of the Factors that Modulate Sensory Dominance.

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Title:An Exploration of the Factors that Modulate Sensory Dominance.
Authors:Ciraolo, Margeaux F.
Contributors:Psychology (department)
Keywords:multisensory integration
sensory dominance
multisensory processing
visual perception
Date Issued:May 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:Investigations of multisensory integration have demonstrated that under certain
conditions, one modality is more likely to show dominance over the other, with strong
evidence over the past few decades suggesting that the visual modality is more dominant.
However, this visual prepotency effect can be reversed to show auditory dominance in
certain tasks. The experimentation conducted within investigated two stimulus
characteristics that have been hypothesized to potentially modulate sensory dominance
using an oddball detection paradigm.
It was hypothesized that when manipulating stimulus transience (by changing the
relative duration of either the auditory or visual stimulus in a bimodal stimulus stream),
participants would show dominance for the modality with the shorter duration, as
theoretically attention would be drawn to the more transient modality. Participants
showed auditory dominance in the 1-button condition irrespective of manipulation to
duration. In the 3-button condition participants showed auditory dominance when looking
at their response times, but also simultaneously demonstrated visual dominance when
using a more traditional measure of sensory dominance (i.e., making a higher proportion
of visually based errors to bimodal trials). Furthermore duration did not modulate these
The second experiment addressed the hypothesis that a stimulus that is presented
earlier will be processed first and therefore contribute to sensory dominance. Stimulus
order was manipulated such that the visual or auditory stimulus was presented prior to
one another. It was hypothesized that dominance would be observed for the stimulus
(auditory or visual) that occurred first. Participants, in the 1-button and 3-button
conditions, were more likely to show auditory dominance with simultaneous
presentations, and under all conditions where the auditory stimulus preceded the visual
stimulus, however auditory dominance was eliminated when the visual stimulus occurred
slightly before the auditory stimulus, only demonstrating visual dominance when the
visual stimulus preceded the auditory stimulus by 200 ms. Errors in the 3-button task
provided evidence for visual dominance which was modulated when presenting auditory
stimuli prior to visual stimuli. Overall these results affirm that auditory dominance effects
are more pronounced early in processing, whereas visual dominance effects are more
pronounced later in processing. Theoretical implications of these results are discussed.
Description:Ph.D. Thesis. University of Hawaiʻi at Mānoa 2018.
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: Ph.D. - Psychology

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