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Free keywords:
movement detectors
visual-motion
perceived direction
blowfly
calliphora
sensitive neurons
lobula plate
optical-flow
system
computation
patterns
Computer Science
Neurosciences & Neurology
Abstract:
We study two-dimensional motion perception in flies using a semicircular visual stimulus. Measurements of both the Hl-neuron and the optomotor response are consistent with a simple model supposing spatial integration of the outputs of correlation-type motion detectors. In both experiment and model, there is substantial Hl and horizontal (yaw) optomotor response to purely vertical motion of the stimulus. We conclude that the fly's optomotor response to a two-dimensional pattern, depending on its structure, may deviate considerably from the direction of pattern motion.
