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Related Experiment Video

Updated: Jul 17, 2026

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

Published on: March 1, 2022

Simple models of assortment through environmental feedback.

John W Pepper¹

¹Department of Ecology & Evolutionary Biology, University of Arizona, 1041 E. Lowell, Tucson, AZ 85721-0088, USA. jpepper1@email.arizona.edu

Artificial Life

|January 6, 2007

Summary

Environmental feedback, a new mechanism, can create genetic similarity among non-kin, promoting the evolution of cooperation and spite. This process influences social evolution by altering local environments based on trait expression.

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Area of Science:

Evolutionary biology
Social evolution
Behavioral ecology

Background:

Social evolution relies on assortment (segregation) between cooperators and noncooperators.
Altruism requires positive assortment, but its origins are debated, with common descent as the leading theory.
Previous models have not fully explored mechanisms beyond common descent for generating nonrandom assortment.

Purpose of the Study:

To investigate environmental feedback as a novel mechanism for generating nonrandom assortment in social evolution.
To determine if environmental feedback can produce positive assortment for cooperation and negative assortment for spite.
To assess the potential of environmental feedback to drive positive frequency-dependent selection.

Main Methods:

Utilized simple computational models to simulate social interactions and environmental feedback.
Varied trait expressions to observe their impact on local environment quality.
Analyzed the resulting genetic similarity among individuals within simulated locales.

Main Results:

Environmental feedback successfully generated significant genetic similarity among non-kin.
The mechanism proved general, sometimes yielding similarity comparable to close kinship.
Environmental feedback also demonstrated the capacity to create negative assortment.

Conclusions:

Environmental feedback is a viable mechanism for generating nonrandom assortment, crucial for social evolution.
This mechanism can facilitate the evolution of both cooperation and spite.
Environmental feedback may play a significant role in inter- and intra-specific social dynamics.