...Thomas W. Small; Eliot A. Brenowitz; Winfried Wojtenek; Ignacio T. Moore In mid- to high-latitude songbirds, seasonal reproduction is stimulated by increasing day length accompanied by elevated plasma sex steroid levels, increased singing, and growth of the song control nuclei (SCN). Plasticity...

...Gregory F. Ball Specialized neural circuitry has evolved in groups of birds where vocal learning is known to occur, such as in the oscine suborder of the Passeriformes (song-birds) and in the order Psittaciformes (parrots). These specializations are most prominent in the telencephalon, while...

...Cynthia Corbitt; Pierre Deviche In seasonally breeding adult male songbirds, the volumes of several song control regions (SCRs) change seasonally in parallel with plasma testosterone (T) levels and decrease following gonadectomy. Testosterone treatment to castrates prevents this decrease...

... of forebrain aromatase in oscines is unknown, however, estrogen-sensitive elements of the telencephalic song circuit (an oscine characteristic) may be influenced by local aromatization. Very few studies have investigated the neuroendocrine characteristics of sub-oscine passerines. Species of this passerine sub...