The cortical neurophysiology of visual-auditory multisensory processing in humans.
Item
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Title
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The cortical neurophysiology of visual-auditory multisensory processing in humans.
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Identifier
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AAI3047247
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identifier
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3047247
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Creator
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Molholm, Sophie.
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Contributor
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Adviser: Walter Ritter
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Date
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2002
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Experimental | Psychology, Physiological | Biology, Neuroscience
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Abstract
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This research investigated the spatio-temporal dynamics of the cortical integration of inputs to the visual and auditory sensory systems, with the use of high-density electrical scalp recordings. The first study examined visual-auditory multisensory neural interactions for basic visual and auditory stimuli under the most simple of tasks. The spatio-temporal dynamics of multisensory neural interactions were mapped over the first 200 ms of cortical processing post-stimulus onset, and compared to ongoing unisensory processing. The second study investigated the spatio-temporal dynamics of multisensory influences on object recognition processes, by comparing multisensory processing of visual and auditory elements that belonged to the same common object or belonged to different common objects (i.e., line drawings or animals and animal vocalizations from the same or different animals), for stimuli that were task relevant versus stimuli that were task irrelevant. Overall, the data from these studies indicate that multisensory interactions occur at many levels of processing, and can be affected by task parameters and the semantic content of the different sensory elements of multisensory stimuli. Further, the data reveal that there is considerable multisensory processing in sensory specific cortical areas, and suggest that in some cases this occurs in a feed-forward manner.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
