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Fig. 5. Sounds and body vibrations are produced by contractions of the remotor and
promotor muscles. (A) Example of a simultaneous accelerometer recording of
body vibrations and remotor and promotor muscle electromyograms (EMGs). The
top photograph shows the anatomy of the two muscles (P, promotor; R, remotor).
(B) Expanded view of a section of a different simultaneous recording of
vibrations and muscle activity. There is a clear one-to-one relationship
between each wave in the accelerometer recording (V), or carapace movement,
and muscle activity. Scale: 10 mV for the top trace (vibration), 8 µV for
the EMG traces; time scale=200 ms; B, top, 8 mV, 20 ms; bottom, 4 µV, 10
ms.
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