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Related Experiment Video

Updated: Jun 15, 2026

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses

Published on: September 28, 2018

Altruism, spite, and greenbeards.

Stuart A West¹, Andy Gardner

¹Department of Zoology, Oxford University, South Parks Road, Oxford OX1 3PS, UK. stuart.west@zoo.ox.ac.uk

Science (New York, N.Y.)

|March 13, 2010

Summary

This summary is machine-generated.

Hamilton's inclusive fitness theory explains altruism and spite. Recent research clarifies debates on extreme altruism, the existence of spite, and greenbeard gene altruism in diverse organisms.

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Last Updated: Jun 15, 2026

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Area of Science:

Evolutionary Biology
Behavioral Ecology

Background:

Hamilton's theory of inclusive fitness provides a framework for understanding altruism and spite.
Several key debates regarding the evolution of these behaviors remain unresolved.

Purpose of the Study:

To clarify recent advancements in understanding altruism and spite.
To connect theoretical frameworks to empirical evidence across various species.

Main Methods:

Review and synthesis of recent research on inclusive fitness, altruism, and spite.
Analysis of case studies from bacteria to humans.

Main Results:

Resolved the debate on whether extreme altruism (e.g., social insect workers) is driven by genetics or ecology.
Provided evidence for the existence of spite in natural populations.
Clarified conditions under which altruism can evolve between non-kin via "greenbeard" genes.

Conclusions:

Recent work has significantly advanced the understanding of altruism and spite.
Hamilton's theory is robustly supported by diverse empirical evidence.
Key evolutionary debates have been settled, linking theory to observable phenomena.