Neurophysiological response selectivity for conspecific songs over synthetic sounds in the auditory forebrain of non-singing female songbirds |
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Authors: | Mark E Hauber Phillip Cassey Sarah M N Woolley Frederic E Theunissen |
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Institution: | (1) Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, USA;(2) School of Biological Sciences, University of Auckland, PB 92019, Auckland, 1142, New Zealand;(3) School of Biological Sciences, University of Birmingham, Edgbaston, UK;(4) Department of Psychology, Columbia University, New York, NY, USA |
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Abstract: | Female choice plays a critical role in the evolution of male acoustic displays. Yet there is limited information on the neurophysiological
basis of female songbirds’ auditory recognition systems. To understand the neural mechanisms of how non-singing female songbirds
perceive behaviorally relevant vocalizations, we recorded responses of single neurons to acoustic stimuli in two auditory
forebrain regions, the caudal lateral mesopallium (CLM) and Field L, in anesthetized adult female zebra finches (Taeniopygia guttata). Using various metrics of response selectivity, we found consistently higher response strengths for unfamiliar conspecific
songs compared to tone pips and white noise in Field L but not in CLM. We also found that neurons in the left auditory forebrain
had lower response strengths to synthetics sounds, leading to overall higher neural selectivity for song in neurons of the
left hemisphere. This laterality effect is consistent with previously published behavioral data in zebra finches. Overall,
our results from Field L are in parallel and from CLM are in contrast with the patterns of response selectivity reported for
conspecific songs over synthetic sounds in male zebra finches, suggesting some degree of sexual dimorphism of auditory perception
mechanisms in songbirds. |
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Keywords: | Auditory cortex Lateralization Mate choice Natural sounds Vocal recognition |
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