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Fig. 7. Wing movements during sound production recorded simultaneously with two
different methods: high-speed video (top) and optical position detector
(bottom). Four frames from one complete wing stroke are shown. Each frame is
accompanied by an oscillogram of the sound (blue) and simultaneous trace of
wing position vs time (red). Vertical broken lines (red) indicate the
position of the scraper in the video frame. In the simultaneous sound and wing
position traces, the vertical broken line indicates the time corresponding to
the video frame. (A) Maximal opening of wings, just prior to engagement of
file and scraper and beginning of sound production. (B) The scraper contacts
the first teeth of the file and the first sound waves are generated. Note
decrease in the slope of wing position (red trace) when the scraper contacts
the first teeth (green broken arrow). (C) The scraper crossing the middle
portion of the file, maximum amplitude of the song pulse, increasing slope of
wing position trace. (D) The scraper contacts the last few teeth of the file
and comes to rest with the end of the sound pulse.
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