... volumes (HVC and Area X) in willow tits (Poecile montanus) , closely related to black-capped chickadees, and in great tits (Parus major) , more closely related to blue tits, from the same area around Oulu, Finland. Both species had larger gonads in spring than during the rest of the year. Great tit males...

..., instructions or products referred to in the content or advertisements. Neurogenesis Songbird HVC Area X Caudomedial nidopallium Motor Behavior Plasticity Stability National Institutes of Health (NIH) 10.13039/100000002 The phenomenon of adult neurogenesis has captivated...

... responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Androgen Area X Bird HVc immunohistochemisry neuroendocrinology Neurogenesis National Institutes of Health (NIH) 10.13039/100000002...

..., remains controversial in part because its neural circuitry remains enigmatic. Songbirds HVC Mirror test Prefrontal cortex Nidopallium Corvids Parrots Willis Köhler Brain To obtain a broad view of how tool use is distributed across the major lineages of birds, Louis Lefebvre and his...

... in breeding condition causes HVC and Area X to shrink to a similar degree as naturally occurs at the end of the breeding season [Gulledge and Deviche, 1997]. Further, T treatment to newly castrated or intact photoregressed adult males maintains or increases, respectively, SCR volumes, confirming that sex...

... subdivisions of the song system. There are positive correlations between song complexity and the volume of motor song system nucleus HVC, both between and within species. The correlations appear to arise because individual differences in volume lead to differences in capacity for learning. The differences...

... of Nissl-defined song-control nuclei (HVc, Area X, and the robust nucleus of the archistriatum) were reconstructed. In contrast to other cardueline finches, GnRH immunoreactivity was relatively stable across the year, exhibiting only modest seasonal variation. The song control system, on the other hand...