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Testosterone: Functions and Regulation

Testosterone: Functions and Regulation

The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...

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Related Experiment Video

Updated: Jul 25, 2025

Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

Published on: March 2, 2011

Free-living gerbils with higher testosterone take fewer risks.

Shani Sarid¹, Hen Naor¹, Mustafa Asfur¹

¹Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel.

Physiology & Behavior

|June 23, 2023

Summary

This summary is machine-generated.

Testosterone (T) levels in Baluchistan gerbils were linked to reduced risk-taking in both males and females. Contrary to expectations, higher T was associated with less risk-taking behavior, regardless of sex.

Keywords:

Gerbils Hair-testing Moonlight Risk-taking Sex differences Steroid manipulation Testosterone

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Area of Science:

Behavioral Ecology
Endocrinology
Animal Behavior

Background:

Circulating androgen levels, particularly testosterone (T), differ between sexes and are linked to aggression and risk-taking in male vertebrates.
The role of T in female behavior is less studied, with assumed higher costs for reproduction and higher benefits for males.

Purpose of the Study:

To investigate the association between endogenous testosterone levels and risk-taking behaviors in male and female Baluchistan gerbils (Gerbillus nanus).
To experimentally determine the effects of elevated testosterone on risk-taking behavior in this species.

Main Methods:

Assessed the relationship between endogenous T levels and risk-taking in free-living gerbils under experimental conditions.
Experimentally increased T levels in gerbils using implants and measured subsequent risk-taking behavior.
Observed foraging behavior in both risky and safe patches and activity patterns during different lunar phases.

Main Results:

Found no sex differences in the association between T and risk-taking; higher T levels were surprisingly linked to fewer risks in both sexes.
Gerbils spent equal time foraging in risky and safe patches, indicating a balanced approach to resource acquisition.
Contrary to expectations for nocturnal animals, gerbils were more active during moonlit nights than dark nights.

Conclusions:

Testosterone's effects on behavior are complex and species-specific, challenging universal hypotheses about its role in risk-taking.
Environmental factors like light regimes and predator presence significantly influence risk-taking strategies, which are not solely dictated by hormone levels.
This study highlights the need to consider species, environment, and context when interpreting the behavioral functions of hormones.