Fig. 7. Electromyogram (EMG) recordings of lesioned and intact muscles. In this example, the left antennal muscles (both remotor and promotor) were lesioned at their insertion into the musculature of the dorsal carapace, while the right antennal muscles were kept intact. While the muscles of the left antenna still contracted, they were unable to cause a vibration (recorded by the accelerometer in the top trace). However, when the intact muscles of the left antenna were active, they produced body vibrations. Lobsters continued to alternate between the muscles of each side and did not avoid using the lesioned muscles. Scale: 20 mV for the top trace (accelerometer), 16 µV for the EMG traces; time scale=100 ms.