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Syringeal Specialization of Frequency Control during Song Production in the Bengalese Finch (Lonchura striata domestica)
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In: ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/be/00/PLoS_One_2012_Mar_27_7(3)_e34135.tar.gz
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Abstract:
Background: Singing in songbirds is a complex, learned behavior which shares many parallels with human speech. The avian vocal organ (syrinx) has two potential sound sources, and each sound generator is under unilateral, ipsilateral neural control. Different songbird species vary in their use of bilateral or unilateral phonation (lateralized sound production) and rapid switching between left and right sound generation (interhemispheric switching of motor control). Bengalese finches (Lonchura striata domestica) have received considerable attention, because they rapidly modify their song in response to manipulations of auditory feedback. However, how the left and right sides of the syrinx contribute to acoustic control of song has not been studied. Methodology: Three manipulations of lateralized syringeal control of sound production were conducted. First, unilateral syringeal muscular control was eliminated by resection of the left or right tracheosyringeal portion of the hypoglossal nerve, which provides neuromuscular innervation of the syrinx. Spectral and temporal features of song were compared before and after lateralized nerve injury. In a second experiment, either the left or right sound source was devoiced to confirm the role of each sound generator in the control of acoustic phonology. Third, air pressure was recorded before and after unilateral denervation to enable quantification of acoustic change within individual syllables following lateralized nerve resection. Significance: These experiments demonstrate that the left sound source produces louder, higher frequency, lower entropy
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URL: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.270.9765
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