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Updated: Apr 6, 2026

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

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

Published on: January 18, 2013

Fluctuating asymmetry and aggression in boys.

J T Manning¹, D Wood²

¹Population Biology Research Group, School of Biological Sciences, University of Liverpool, PO Box 147, L69 3BX, Liverpool, U.K.. jtmann@liv.ac.uk.

Human Nature (Hawthorne, N.Y.)

|July 22, 2015

Summary

More symmetrical boys aged 10-15 exhibited higher physical aggression. This study explored fluctuating asymmetry (FA), small deviations from symmetry, and its link to aggression in young males.

Keywords:

Aggression Cortisol Fluctuating asymmetry Hormonal fluctuation Testosterone

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Area of Science:

Developmental Biology
Behavioral Genetics
Human Biology

Background:

Fluctuating asymmetry (FA) refers to minor deviations from bilateral symmetry in symmetrical traits.
FA can be influenced by developmental instability, potentially linked to hormonal factors.
Previous research suggests potential links between FA and various behavioral traits.

Purpose of the Study:

To investigate the relationship between fluctuating asymmetry (FA) in specific body traits and aggression levels in adolescent boys.
To determine if FA of physical traits correlates with self-reported physical and verbal aggression.

Main Methods:

Measurements of five body traits (ear height, digit length, ankle circumference) were taken from 90 boys (aged 10-15).
FA was calculated for each trait.
Self-reported scores for physical and verbal aggression were collected.
Statistical analyses examined correlations between FA metrics and aggression scores.

Main Results:

A negative correlation was observed between FA and aggression scores, particularly physical aggression; higher symmetry was associated with higher aggression.
Ankle circumference demonstrated ideal FA characteristics (mean asymmetry near zero, normal distribution).
Repeated measures of ankle FA showed a strong negative association with physical aggression, independent of age, height, and weight.

Conclusions:

Developmental instability, as indicated by FA, may be inversely related to physical aggression in adolescent males.
Hormonal influences on soft tissue FA, such as cortisol, could mediate the observed link between FA and behavior.
Further research is warranted to explore the causal pathways between hormonal regulation, FA, and aggression.