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Figure 2


Fig. 2. Optomotor steering responses to panoramic image motion. (A) Example response to a test expansion (Exp) and rotation (Rot) stimulus. In response to expansion from the left, the amplitude of the right wing beat decreases while the amplitude of the left increases. As such left minus right amplitude ({Delta}WBA) increases in response to both stimuli, but with varying amplitude. Between test periods, the fly has active control of a single vertical stripe. (B,C) Mean responses to systematic variation in the spatial period (B) and velocity of pattern motion (C). Solid line, mean time-averaged responses; gray envelope, s.e.m.; N=36 flies. Red segments, 3-s open-loop expansion test periods; blue segments, rotation tests; black segments, intervening 5-s closed-loop control periods. Each row shows mean responses to striped grating spatial period as indicated. {Delta}WBA, (L–R, V) refers to left minus right wing beat amplitude encoded in V. The time-varying voltage signal is directly proportional to yaw torque.





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