(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 3. Frame-by-frame sequence of walking phonotaxis in response to a lateral
sound source. Time is indicated on the vertical axis (progressing downward).
Top layer shows complete sequence and lower layers repeat selected frames for
clarity (times of selected frames indicated in bold). The fly initiates
forward translation and rotation simultaneously and walks in a tight arc until
oriented towards the speaker.