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Home | Seminars and Symposia | Past seminars/symposia: Monday, November 11, 2002

DTC Seminar Series

Data Fusion and Credit Assignment Problems in Human Perception


Paul Schrater
University of Minnesota
Psychology and Computer Science

Monday, November 11, 2002
3:30 pm

402 Walter Library

Dr. Paul Schrater’s fundamental research goal is in perception and action in the develop quantitative and predictive models of perception in real-world tasks. Most of his research revolves around two key problems to perception and action: how do we learn to integrate sensory information effectively, and how do we determine what sensory information deserves the credit (or blame) for an observer’s performance? Computationally, the effective use of sensory information can be described as data fusion, involving both the selection of task relevant information and the rules for combining it. Assessing the effectiveness of the observer’s data fusion strategy requires solving a kind of credit assignment problem. The research involves developing and test data fusion models using statistical decision theory. Dr. Schrater will attempt overviews of his investigation into three issues in visual perception: how observers use touch feedback to modify their use of visual information to object depth; determining the image information that supports depth perception in complex scenes; determining how image information is combined in the brain using neuroimaging. The uses of quantitative models for visual perception include: a quantitative framework useful to engineers designing virtual reality simulators and human/machine interfaces; a normative standard and measure of perceptual expertise useful to assess competence in fields like medicine and image analysis; more efficient training by providing feedback about the information important for the task; and an improved understanding of our own perceptual abilities.


Dr. Paul Schrater holds a joint faculty position at the University of Minnesota, in the departments of Computer Science and Psychology. I received my Ph.D. from the Department of Neuroscience of the University of Pennsylvania, under David Knill, then of the Department of Psychology and Eero Simoncelli in the GRASP Laboratory who at that time had a primary appointment in the Department of Computer Science at Penn. Dr. Schrater issertation involved a psychophysical and ideal observer analysis of local motion processing.