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Science 17 August 1979:
Vol. 205. no. 4407, pp. 702 - 705
DOI: 10.1126/science.205.4407.702
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Articles

Sexual Difference in Pattern of Hormone Accumulation in the Brain of a Songbird

ARTHUR P. ARNOLD 1 and ALBERT SALTIEL 1

1 Department of Psychology and Brain Research Institute, University of California, Los Angeles 90024

After adult zebra finches (Poephila guttata) received injections of tritiated testosterone, fewer hormone-concentrating cells were found in females than in males in two brain regions involved in song: hyperstriatum ventrale pars caudale and magnocellular nucleus of the anterior neostriatum. In some other regions, no sexual difference was detected. It is, therefore, possible that sex differences in the sensitivity of specific neural populations to hormones underlie the striking anatomical dimorphism observed in neural regions controlling song.

Submitted on October 26, 1978
Revised on April 17, 1979


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