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Updated: Jun 13, 2026
11:51
Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
Published on: March 2, 2011
Competitive experience activates testosterone-dependent social aggression toward unfamiliar males
D J Albert1, D M Petrovic, M L Walsh
1Psychology Department, University of British Columbia, Vancouver, Canada.
Physiology & Behavior
|April 1, 1989
Summary
Testosterone implants increased aggression in male rats during food competition and toward intruders. Competitive experience further amplified this testosterone-driven social aggression, demonstrating its situational activation.
Area of Science:
- Neuroscience
- Behavioral Endocrinology
- Animal Behavior
Background:
- Testosterone is known to influence social behaviors, including aggression.
- The role of competitive experiences in modulating testosterone-mediated aggression requires further investigation.
Purpose of the Study:
- To investigate the effects of testosterone and competitive experience on social aggression in male rats.
- To determine if competitive situations potentiate testosterone-induced aggression.
Main Methods:
- Castrated male hooded rats received testosterone or empty implants.
- Animals were subjected to either food competition or no competition.
- Aggression was assessed in food competition tests and toward unfamiliar intruders.
Main Results:
- Testosterone-implant rats showed increased aggression and food acquisition success during competition.
- Prior food competition experience enhanced aggression toward unfamiliar intruders in testosterone-implant rats.
- Competitive experience was necessary to elevate aggression in testosterone-implant rats compared to controls.
Conclusions:
- Testosterone-dependent social aggression is activated by competitive situations and elicited by unfamiliar male intruders.
- The study confirms that increased testicular testosterone secretion is not required for the activation of social aggression.
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