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The respiratory rhythm determines the temporal pattern of song. Sound is produced during expiration and each syllable is typically followed by a small inspiration, except at the highest syllable repetition rates when a pattern of pulsatile expiration is used. Both expiration and inspiration are active processes. The oscine vocal organ, the syrinx, contains two separate sound sources at the cranial end of each bronchus, each with independent motor control. Dorsal syringeal muscles regulate the timing of phonation by adducting the sound\u2013generating labia into the air stream. Ventral syringeal muscles have an important role in determining the fundamental frequency of the sound. Different species use the two sides of their vocal organ in different ways to achieve the particular acoustic properties of their song. Reversible paralysis of the vocal organ during song learning in young birds reveals that motor practice is particularly important in late plastic song around the time of song crystallization in order for normal adult song to develop. Even in adult crystallized song, expiratory muscles use sensory feedback to make compensatory adjustments to perturbations of respiratory pressure. The stereotyped beak movements that accompany song appear to have a role in suppressing harmonics, particularly at low frequencies.<\/jats:p>","DOI":"10.1098\/rstb.1999.0444","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T19:55:21Z","timestamp":1027713321000},"page":"927-939","source":"Crossref","is-referenced-by-count":179,"title":["The neuromuscular control of birdsong"],"prefix":"10.1098","volume":"354","author":[{"given":"Roderick","family":"Suthers","sequence":"first","affiliation":[{"name":"School of Medicine, Jordan Hall, Indiana University, Bloomington, IN 47405, USA"},{"name":"Department of Biology, Indiana University, Bloomington, IN 47405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franz","family":"Goller","sequence":"additional","affiliation":[{"name":"School of Medicine, Jordan Hall, Indiana University, Bloomington, IN 47405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolyn","family":"Pytte","sequence":"additional","affiliation":[{"name":"Department of Biology, Indiana University, Bloomington, IN 47405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[1999,5,29]]},"reference":[{"key":"p_1","first-page":"964","article-title":"Syringeal muscle activity during song in brown-headed cowbirds","volume":"21","author":"Allan S. 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