Article (Scientific journals)
Testosterone regulates birdsong in an anatomically specific manner
Alward, B. A.; Rouse, M. L.; Balthazart, Jacques et al.
2017In Animal Behaviour, 124, p. 291-298
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Keywords :
Serinus canaria; songbird; Song control system
Abstract :
[en] The functions of birdsong include attracting a mate and repelling competitors. It is therefore not surprising that, in males in the temperate zone especially, birdsong is often produced in the context of reproduction. Testosterone of gonadal origin increases during the reproductive phase of the annual cycle and can significantly influence song production as well as song development via effects on song crystallization (testosterone secretion at the time of sexual maturity is essential for full crystallization to occur). In males, testosterone of gonadal origin can exert its effects in the brain on song and other reproductive behaviour via its oestrogenic and androgenic metabolites. The widespread distribution of nuclear androgen receptors in the song system and the occurrence of oestrogen receptors in one key forebrain nucleus in certain species as well as the presence of both receptor types in the diencephalon and the midbrain raises questions as to where and how testosterone is exerting its myriad effects on song. By selectively implanting testosterone into specific brain regions of castrated male canaries, Serinus canaria, we have identified the medial preoptic area as a critical site for the induction of a generalized increase in motivation that includes the motivation to sing. Testosterone action in the forebrain song nucleus HVC in contrast increases song stereotypy. Canaries receiving testosterone in the preoptic area and HVC sing stereotypic songs but at a much lower amplitude, indicating that testosterone's effects on amplitude are regulated elsewhere in the brain or the periphery. The lateral part of the magnocellular nucleus anterior nidopallium (LMAN) is a song nucleus that expresses a high density of androgen receptors and plays a role as a song variability generator during song learning. When adult female canaries are treated with testosterone, their song becomes more complex. Lesions to LMAN attenuate these effects on adult behavioural change, suggesting that testosterone may act in LMAN during song ontogeny to modulate changes associated with song crystallization. These anatomically specific effects illustrate how a single hormone can coordinate changes in many aspects of a complex behaviour to facilitate successful reproduction. © 2016 The Association for the Study of Animal Behaviour
Disciplines :
Animal psychology, ethology & psychobiology
Zoology
Author, co-author :
Alward, B. A.;  Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, United States, Department of Psychology, University of Maryland, College ParkMD, United States
Rouse, M. L.;  Jr., Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, United States, Department of Reproductive Medicine, University of California – San Diego, La Jolla, CA, United States
Balthazart, Jacques  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques
Ball, G. F.;  Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, United States, Department of Psychology, University of Maryland, College ParkMD, United States
Language :
English
Title :
Testosterone regulates birdsong in an anatomically specific manner
Publication date :
2017
Journal title :
Animal Behaviour
ISSN :
0003-3472
eISSN :
1095-8282
Publisher :
Academic Press
Volume :
124
Pages :
291-298
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Grant from the National Institutes of Health NIH/NINDS R01 NS35467; BELSPO grant SSTC PAI P7/17
Funders :
NIH - National Institutes of Health
BELSPO - Politique scientifique fédérale
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