Fruit flies increase attention to their frontal visual field during fast forward optic flow.

Fruit flies must compensate for the limited light gathered by the tiny facets of their eyes, and image motion during flight lowers light catch even further. Motion blur is especially problematic in fast regions of the visual field, perpendicular to forward motion, but flow fields also contain slower regions, less affected by blur. To test whether fruit flies shift their attention to predictably slower regions of a flow field, we placed flies in an arena simulating forward flight and measured responses to turning cues in different visual areas. We find that during fast forward flight, fruit flies respond more strongly to turning cues presented directly in front, and less strongly to cues presented to the sides, supporting the hypothesis that flying fruit flies shift visual attention to slower moving regions less affected by motion blur.