Figure 5.

Premotor neural activity in the SC associated with sonar call production. A, Time waveform and spectrogram of a single 3.8-ms-duration sonar vocalization produced during virtual target amplitude discrimination experiment. B, Neural activity recorded simultaneously with sonar vocalizations in the SC. Bouts of neural activity in the superior colliculus consistently precede the onset of sonar vocalizations. Red ticks above neural activity in B and C are identically placed and correspond with the onset time of sonar vocalizations. C, Rectified waveform of the neural activity in B, low-pass filtered (<100 Hz) with an eighth-order Butterworth filter.