6. Hormonal Control of Communication
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Figure 6.8. Extracellular recordings from laryngeal motor nerve along with sound
amplitude waveforms of male and female vocalizations. The top trace of each panel
is the amplitude waveform (sound amplitude over time); the bottom trace is nerve
recordings (voltage over time). Each burst of activity on nerve recordings indicates
the compound action potential of laryngeal motoneurons, whereas the burst of
activity on sound recordings indicates a click sound. Note that each compound
action potential precedes each click sound. A: Male vocalizations; A1: nerve recordings during amplectant call; A2: nerve recordings during advertisement call; A3:
nerve recordings during growling; B: female vocalization; B1: nerve recordings
during ticking.