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Lookup NU author(s): Dr Tom SmuldersORCiD
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A meta-analysis of the literature shows that in adult male songbirds, brain mass, telencephalon volume and n. rotundus (a thalamic visual nucleus) volume increase from the nonbreeding season (low testosterone) to the breeding season (higher testosterone). These effects can at least partially be mimicked by photoperiod manipulations in captivity. In contrast, an artificial testosterone (T) titer increase by chronic implants yields the opposite results: telencephalon, n. rotundus, and n. pretectalis volumes are lower in T-treated animals than in controls. These results suggest that artificial testosterone manipulations do not necessarily mimic the effects of natural variations in hormone levels and that results from experiments using T implants to mimic natural hormonal effects should be interpreted with caution. (C) 2002 Elsevier Science (USA). [References: 101]
Author(s): Smulders TV
Publication type: Article
Publication status: Published
Journal: Hormones and Behavior
Year: 2002
Volume: 41
Issue: 2
Pages: 156-169
ISSN (print): 0018-506X
ISSN (electronic): 1095-6867
Publisher: Academic Press
URL: http://dx.doi.org/10.1006/hbeh.2001.1748
DOI: 10.1006/hbeh.2001.1748
Notes: Review ACADEMIC PRESS INC, 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA. URL: http://www.apnet.com
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