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Fig. 8. Schematic model for the spatial organization of visuomotor reflexes in
Drosophila. Image motion within individual quarter-fields is
temporally filtered and spatially summed (see text for details). Motion across
the frontal visual hemisphere results in a syndirectional turn, whereas motion
in the rear results in a counterdirectional turn. By summation, full-field
rotation results in a weak syndirectional turn. However, a pattern of
expansion centered laterally produces a stronger turn away from the focus of
expansion. Note that the polarity of turning responses to motion within the
rear quarter-fields is independent of the direction of image motion.
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