TY - JOUR
T1 - Seasonal plasticity in the song control system
T2 - Multiple brain sites of steroid hormone action and the importance of variation in song behavior
AU - Ball, Gregory F.
AU - Auger, Catherine J.
AU - Bernard, Daniel J.
AU - Charlier, Thierry D.
AU - Sartor, Jennifer J.
AU - Riters, Lauren V.
AU - Balthazart, Jacques
PY - 2004
Y1 - 2004
N2 - Birdsong, in non-tropical species, is generally more common in spring and summer when males sing to attract mates and/or defend territories. Changes in the volumes of song control nuclei, such as HVC and the robust nucleus of the arcopallium (RA), are observed seasonally. Long photoperiods in spring stimulate the recrudescence of the testes and the release of testosterone. Androgen receptors, and at times estrogen receptors, are present in HVC and RA as are co-factors that facilitate the transcriptional activity of these receptors. Thus testosterone can act directly to induce changes in nucleus volume. However, dissociations have been identified at times among long photoperiods, maximal concentrations of testosterone, large song control nuclei, and high rates of song. One explanation of these dissociations is that song behavior itself can influence neural plasticity in the song system. Testosterone can act via brain-derived neurotrophic factor (BDNF) that is also released in HVC as a result of song activity. Testosterone could enhance song nucleus volume indirectly by acting in the preoptic area, a region regulating sexual behaviors, including song, that connects to the song system through catecholaminergic cells. Seasonal neuroplasticity in the song system involves an interplay among seasonal state, testosterone action, and behavioral activity.
AB - Birdsong, in non-tropical species, is generally more common in spring and summer when males sing to attract mates and/or defend territories. Changes in the volumes of song control nuclei, such as HVC and the robust nucleus of the arcopallium (RA), are observed seasonally. Long photoperiods in spring stimulate the recrudescence of the testes and the release of testosterone. Androgen receptors, and at times estrogen receptors, are present in HVC and RA as are co-factors that facilitate the transcriptional activity of these receptors. Thus testosterone can act directly to induce changes in nucleus volume. However, dissociations have been identified at times among long photoperiods, maximal concentrations of testosterone, large song control nuclei, and high rates of song. One explanation of these dissociations is that song behavior itself can influence neural plasticity in the song system. Testosterone can act via brain-derived neurotrophic factor (BDNF) that is also released in HVC as a result of song activity. Testosterone could enhance song nucleus volume indirectly by acting in the preoptic area, a region regulating sexual behaviors, including song, that connects to the song system through catecholaminergic cells. Seasonal neuroplasticity in the song system involves an interplay among seasonal state, testosterone action, and behavioral activity.
KW - Catecholamine
KW - European starling
KW - Photoperiod
KW - Seasonal reproduction
KW - Testosterone
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U2 - 10.1196/annals.1298.043
DO - 10.1196/annals.1298.043
M3 - Article
C2 - 15313796
AN - SCOPUS:3242678695
SN - 0077-8923
VL - 1016
SP - 586
EP - 610
JO - Annals of the New York Academy of Sciences
JF - Annals of the New York Academy of Sciences
ER -