Fig. 6. Average responses of tethered flies walking on a treadmill for speaker azimuth 0° (A–C, N=18 flies, 10 runs/fly) and 90° (B–F, N=7 flies, 10 runs/fly). (A,D) Mean walking path; (B,E) cumulative distance vs time from stimulus onset; (C,F) instantaneous velocity vs time from stimulus onset. Open symbols and gray line in C show a single response in which the fly decelerated to a complete stop following stimulus offset. Bold horizontal lines in B,C,E,F indicate stimulus duration.