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Exploring peripheral lateralization in the Bengalese finch, Lonchura striata domestica
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[Fort Worth, Tex.] : Texas Christian University,
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2013
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Songbirds produce a diversity of vocalizations with two sets of avian vocal folds (labia). In Bengalese finches (Lonchura striata domestica), each side of the syrinx (vocal organ) makes a different contribution to the bird's song. Louder, higher frequency notes are generated by the left labia. Softer, lower frequency notes are right-side generated. Females were devocalized to determine whether acoustic lateralization is sexually dimorphic and we confirmed male and female birds follow the same pattern of acoustic lateralization. Therefore, we studied syringeal morphology and microstructure for peripheral contributions to acoustic lateralization. Length, area, and density of tissue extracellular matrix (ECM) components within the left and right sides of the labia were quantified. In both males and females, there were strong morphological asymmetries between the sound sources; however, there were no differences in ECM components. These data indicate that morphological differences in the vocal tissue support a model of lateralized sound production.
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Psychology