Fig. 8. Characteristics of phonotactic responses as a function of source azimuth. (A) Peak (filled circles) and average (open circles) rotational velocity vary systematically with source azimuth, but saturate at large angles. (B) Angular variance of response orientation varies with source azimuth. Orientation is most variable at intermediate angles. (C) Peak translational velocity is highly variable and does not show a consistent pattern of variation with source azimuth. (D) Neither latency to peak translational velocity (filled circles) nor latency to peak rotational velocity (open circles) differs significantly for different stimulus angles. Horizontal line indicates end of stimulus duration. Peak translational velocity occurs after the end of the stimulus, whereas peak rotational velocity occurs earlier than stimulus offset. Data are means ± S.E.M. (N=7 flies, 10 runs/angle/fly).