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Peering into the Dynamics of Social Interactions: Measuring Play Fighting in Rats

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Published on: January 18, 2013

Second to fourth digit ratio and cooperative behavior.

Kobe Millet¹, Siegfried Dewitte

¹Department of Marketing, Katholieke Universiteit Leuven, Naamsestraat 69, 3000 Leuven, Belgium. Kobe.Millet@econ.kuleuven.be

Biological Psychology

|July 19, 2005

Summary

A low second to fourth digit ratio (2D:4D), linked to testosterone, surprisingly correlated with cooperative behavior, not egoism or altruism. This suggests a preference for normative behavior may be a high-testosterone strategy for gaining status.

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Area of Science:

Behavioral economics
Evolutionary psychology
Human behavior

Background:

A low second to fourth digit ratio (2D:4D) is hypothesized to correlate with higher prenatal testosterone exposure.
This ratio has been linked to various behavioral and psychological traits, including status-seeking behaviors.
Social dilemmas present opportunities to gain status through egoistic, altruistic, or cooperative actions.

Purpose of the Study:

To investigate the relationship between the 2D:4D ratio and different social decision-making strategies in a social dilemma context.
To test the hypothesis that a low 2D:4D ratio is associated with egoistic and altruistic behaviors as pathways to status.
To explore whether a low 2D:4D ratio predicts normative cooperative behavior.

Main Methods:

Participants' 2D:4D ratios were measured.
Behavioral responses in a social dilemma game were recorded, categorizing actions as egoistic, altruistic, or cooperative.
Statistical analyses were performed to correlate 2D:4D ratio with behavioral strategies.

Main Results:

Contrary to predictions, a low 2D:4D ratio was significantly associated with increased cooperative behavior.
Participants with a low 2D:4D ratio were less likely to engage in egoistic or altruistic behaviors.
The findings indicate an inverse relationship between low 2D:4D and non-normative social strategies.

Conclusions:

The study challenges the direct link between low 2D:4D, high testosterone, and status-seeking via egoism or altruism.
A low 2D:4D ratio may instead be associated with a preference for normative behavior as a strategy for social status.
These results suggest distinct testosterone-mediated strategies for status attainment, with a preference for conformity potentially being a high-testosterone approach.