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Effects of captivity and testosterone on the volumes of four brain regions in the dark-eyed junco (Junco hyemalis)

Lookup NU author(s): Dr Tom SmuldersORCiD


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This study investigates the effects of captivity and testosterone treatment on the volumes of brain regions involved in processing visual and spatial information in adult dark-eyed juncos (Junco hyemalis). We treated captive and free-living male juncos with either testosterone-filled or empty implants. Captive juncos had a smaller hippocampal formation (HF) (both in absolute volume and relative to telencephalon) than free-living birds, regardless of hormone treatment. Testosterone-treated males (both captive and free-living) had a smaller telencephalon and nucleus rotundus, but not a smaller HF or ectostriatum, than controls. We found that free-living testosterone-treated males had larger home ranges than free-living controls in agreement with earlier experiments, but we found no corresponding difference in HF volume. We discuss the implications of the effect of captivity on HF volume for past and future laboratory experiments. (C) 2000 John Wiley & Sons, Inc. [References: 60]

Publication metadata

Author(s): Smulders TV, Casto JM, Nolan V, Ketterson ED, DeVoogd TJ

Publication type: Article

Publication status: Published

Journal: Journal of Neurobiology

Year: 2000

Volume: 43

Issue: 3

Pages: 244-253

ISSN (print): 0022-3034

ISSN (electronic): 1932-846X

Publisher: John Wiley & Sons, Inc.


DOI: 10.1002/(SICI)1097-4695(20000605)43:3<244::AID-NEU3>3.0.CO;2-#

Notes: Jun 5 Smulders TV Wake Forest Univ, Sch Med, Dept Physiol & Pharmacol 300 S Hawthorne Rd Winston Salem, NC 27157 USA Cornell Univ, Dept Psychol Ithaca, NY 14853 USA Indiana Univ, Dept Biol Bloomington, IN 47405 USA Indiana Univ, Ctr Integrat Study Anim Behav Bloomington, IN 47405 USA


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