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EMG activity of the TA and CT muscles during 50-kHz call production from 3 male rats (A, B, and C). Unmodulated F0 is associated with tonic EMG activity. Frequency modulated calls are associated with short bursts in EMG activity. In C no sound was recorded, but the pressure signal resembled that in recordings with sound recording. EMG activity is displayed as a rectified original trace (downward) and a low-pass filtered (300 Hz) trace (upward).
