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Table 1 fUSV production in the excised rat larynx requires vocal fold adduction

From: Aerodynamics and motor control of ultrasonic vocalizations for social communication in mice and rats

  Abducted VF, 1/10 Adducted VF, 10/10
Phonation threshold pressure (kPa) 0.7 0.8 ± 0.3
Airflow (ml/s) 1.7 to 1.8 2.6 ± 0.6 to 3.7 ± 1.1
fp (kHz) 39 to 41 25 to 61