Fig. 7. Orientation of walking phonotaxis. Walking path for single responses of a freely walking (A) and tethered fly (B) to a speaker at 90°. Symbols indicate instantaneous heading at each time-step, with those in red indicating the duration of the stimulus. (C) Instantaneous angular heading vs time from stimulus onset for three different stimulus angles in a tethered fly. Plots are averages of 10 runs each. Vertical line indicates end of stimulus. (D) Rotational velocity vs time from stimulus onset for the same responses as shown in C. Peak rotational velocity occurs midway through the stimulus duration regardless of turn angle, and rotation decelerates before stimulus offset.