TOCS Event-Silicon Valley Campus - Carnegie Mellon University

TOCS Event


Jeffrey Mulligan

Jeffrey Mulligan
Computer Engineer with NASA
Human Systems Integration Division


February 28, 1:30 pm



CMUSV, Rm 118 [directions]

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Title: An Eye-Movement-Defined Hierarchy of Visual Stimuli
Abstract: Traditionally, smooth eye movements have been classified as either "pursuit" (voluntary tracking of a small target) or "ocular following"(reflexive movement in the direction of a large stimulus). I will present a series of experiments which support a slightly different view, in which pursuit can be seen to contain both voluntary and reflexive components. Certain higher-order stimuli (such as a pattern defined by contrast modulation of a base texture) are shown to be incapable of generating purely reflexive movements, while a particular type of eye movement (vertical vergence) can only be made reflexively. I propose a model of the system in which a fast reflexive system responds to a limited class of stimuli, while a slower voluntary system is capable of tracking anything that can be seen. Joint work with Scott B. Stevenson, University of Houston College of Optometry
Speaker Bio: Jeffrey B. Mulligan is a computer engineer in the Human Systems Integration Division at NASA Ames Research Center. He holds an A.B. degree in physics from Harvard University, and the M.A. and Ph.D. degrees in experimental psychology from the University of California at San Diego. His work includes engineering development of video-based eye-tracking systems, and the application of these to applied problems such as operator state assessment and interface design.