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  • Friday, December 9, 2011
    Perception of visual motion in 3d space

    For many species, when an object looms towards them, thus causing the
    image to expand on their retina, this typically elicits an escape or
    avoidance response. Similarly, object image expansion on the retina can
    also result when the animal approaches an object and this input can also
    be used in the modulation of locomotor behavior (e.g., braking to avoid a
    collision). One variable that has proven critical for computing the
    time-to-collision is tau, which is optically defined as visual angle of an
    approaching object divided by the momentary rate of expansion. In this
    talk, I will present our recent research on human observers involving a
    careful re-evaluation of the tau hypothesis by separating the contribution
    of different types of visual information. I will also present results from
    experiments comparing the processing of impending collision in object
    motion and self-motion.

    Hong-Jin Sun
    MacMaster University