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Interactions between auditory and visual motion mechanisms and the role of attention: psychophysics and quantitative models
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Interactions between auditory and visual motion mechanisms and the role of attention: psychophysics and quantitative models
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Jain
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Anshul
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Anshul Jain
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Thomas
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Thomas V Papathomas
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Madabhushi
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John
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John L Semmlow
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Troy
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Singh
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Manish
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Advisory Committee
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Manish Singh
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Rutgers University
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Graduate School - New Brunswick
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theses
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2008
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2008-10
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English
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electronic
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xiv, 145 pages
Abstract
The human brain continuously receives sensory input from the dynamic physical world via various sensory modalities. In many cases, a single physical event generates simultaneous input to more than one modality. For example, a ball hitting the ground generates both visual and auditory input. The human brain has developed mechanisms to take advantage of the correlations between inputs to different modalities to form a uniform and stable percept. Recently, there has been a lot of research interest, psychophysical, neurophysiological and computational, to explore the mechanisms involved in crossmodal interactions in general and auditory-visual interactions in particular.
The current thesis makes three significant contributions to the field of auditory-visual interactions. First, I designed a comprehensive study to psychophysically examine the interactions between auditory and visual motion mechanisms for three different motion configurations: horizontal, vertical and motion-in-depth. I showed that simultaneous presentation of a strong motion signal in one modality influences perception of a weak motion signal in the other modality both when the weak motion in presented in the visual, as well as in the auditory modality. I further observed that crossmodal aftereffects were induced only when subjects adapted to spatial motion in the visual modality and not in the auditory modality. However, adaptation to auditory spectral motion did induce vertical visual motion aftereffects. To my knowledge, this is the first report of auditory-induced visual aftereffects. Second, I conducted psychophysical experiments to study the effects of spectral attention on the visual and the auditory motion mechanisms and showed that there are similar attentional effects on motion mechanisms within the two modalities. Third, I developed a neurophysiologically relevant computational model to provide a possible explanation for crossmodal interactions between the auditory and the visual motion mechanisms. In addition, I developed a model that can explain the observed experimental findings on the role of spectral attention in modulating motion aftereffects. The results obtained from both the model simulations agree very closely with the human behavioral data obtained from the experiments.
The current thesis makes three significant contributions to the field of auditory-visual interactions. First, I designed a comprehensive study to psychophysically examine the interactions between auditory and visual motion mechanisms for three different motion configurations: horizontal, vertical and motion-in-depth. I showed that simultaneous presentation of a strong motion signal in one modality influences perception of a weak motion signal in the other modality both when the weak motion in presented in the visual, as well as in the auditory modality. I further observed that crossmodal aftereffects were induced only when subjects adapted to spatial motion in the visual modality and not in the auditory modality. However, adaptation to auditory spectral motion did induce vertical visual motion aftereffects. To my knowledge, this is the first report of auditory-induced visual aftereffects. Second, I conducted psychophysical experiments to study the effects of spectral attention on the visual and the auditory motion mechanisms and showed that there are similar attentional effects on motion mechanisms within the two modalities. Third, I developed a neurophysiologically relevant computational model to provide a possible explanation for crossmodal interactions between the auditory and the visual motion mechanisms. In addition, I developed a model that can explain the observed experimental findings on the role of spectral attention in modulating motion aftereffects. The results obtained from both the model simulations agree very closely with the human behavioral data obtained from the experiments.
Note
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Ph.D.
Note
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Includes bibliographical references (p. 139-144).
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Biomedical Engineering
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Cognitive neuroscience
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Topic
Auditory perception
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Visual perception
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Attention
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Graduate School - New Brunswick Electronic Theses and Dissertations
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doi:10.7282/T3S182T6
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ETD doctoral
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Anshul Jain
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Rutgers University. Graduate School - New Brunswick
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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