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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18831

Title: Crossmodal Modulation as a Basis for Visual Enhancement of Auditory Performance
Authors: Qian, Cheng
Advisor: Wong, Willy
Department: Electrical and Computer Engineering
Keywords: crossmodal
auditory detection
visual enhancement
sensory modelling
Issue Date: 15-Feb-2010
Abstract: The human sensory system processes many modalities simultaneously. It was believed that each modality would be processed individually first, and their combination deferred to higher-level cortical areas. Recent neurophysiological investigations indicate interconnections between early visual and auditory cortices, areas putatively considered unimodal, but the function remains unclear. The present work explores how this cross-modality might contribute to a visual enhancement of auditory performance, using a combined theoretical and experimental approach. The enhancement of sensory performance was studied through a signal detection framework. A model was constructed using principles from signal detection theory and neurophysiology, demonstrating enhancements of roughly 1.8dB both analytically and through simulation. Several experiments were conducted to observe e ects of visual cues on a 2-alternative-forced-choice detection task of an auditory tone in noise. Results of the main experiment showed an enhancement of 1.6dB. Better enhancement also tended to occur for more realistic relationships between audio to visual stimuli.
URI: http://hdl.handle.net/1807/18831
Appears in Collections:Master
The Edward S. Rogers Sr. Department of Electrical & Computer Engineering - Master theses

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