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- W2059575364 abstract "The echolocating clicks of oilbirds (Steatornis caripensis) are generated in two bronchial semisyringes. Each click has a duration of 20 to 60 ms and may consist of a continuous broadband sound or be divided by a short silent interval into two shorter sounds. Electromyograms, together with measurements of subsyringeal pressure, tracheal pressure, and the rate of tracheal airflow, show that clicks are preceded by contraction of the sternotrachealis muscles which move the syrinx caudad, causing adduction of the syringeal membranes during expiratory airflow and initiating phonation. Subsequent contraction of a previously undescribed syringeal muscle terminates the click by rotating a syringeal cartilage and abducting the external tympaniform membranes. This syringeal muscle does not contract during longer duration vocalizations. It is thus specialized for the production of clicklike sounds. Simultaneous measurement of the rate of airflow through each semisyrinx indicates that during some clicks one semisyrinx closes while the other remains open. This is the first evidence that airflow through each side of the syrinx can be independently controlled during pronation. [Work supported by NSF.]" @default.
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- W2059575364 date "1983-11-01" @default.
- W2059575364 modified "2023-10-09" @default.
- W2059575364 title "Mechanisms of sonar pulse production by oilbirds" @default.
- W2059575364 doi "https://doi.org/10.1121/1.2020912" @default.
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