Zebra Finches:Sexually dimorphic nuclei- HVC and RA are 3 to 6 times larger in ______- X area cannot even be discerned in ______- Neurons are larger, more numerous, and further apart in ________________ leads to a reduction in singing, but not the size of the brain nuclei controlling song productionT treatment in adult females does not induce changes in either singing or in the size of the song control regions Activation effects of steroids ALONE do not account for sex differences in the brain nucleus size or in singing behavior in zebra finches.

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