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Evolutionary Psychology

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.

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Related Experiment Video

Updated: Jun 20, 2026

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

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Published on: December 2, 2022

Evolution towards self-compatibility when mates are limited.

¹Institute of Integrative Biology, Plant Pathology, ETH Zürich, Universitätstrasse 2, Zürich, Switzerland. yvonne.willi@agrl.ethz.ch

Journal of Evolutionary Biology

|August 26, 2009

Summary

Limited mates, not inbreeding depression, drive self-compatibility evolution in plants. This study found that reduced availability of compatible mates, not inbreeding depression, promotes self-compatibility in Ranunculus reptans.

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Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses

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Published on: June 16, 2020

Area of Science:

Plant evolutionary biology
Reproductive strategies
Population genetics

Background:

Plant mating system evolution is influenced by self-incompatibility (SI) and self-compatibility (SC).
Theories predict SC spread when inbreeding depression (ID) is low and mates are scarce.
Ranunculus reptans (creeping buttercup) provides a model to test these predictions.

Purpose of the Study:

To investigate the occurrence of SC in natural populations of R. reptans.
To determine if ID or mate availability influences SC evolution.
To test for delayed SC under different pollination timings.

Main Methods:

Assessed SC occurrence across 13 natural R. reptans populations.
Conducted enforced selfing experiments over two years.
Measured inbreeding depression and frequency of compatible mates.

Main Results:

SC was relatively common, but selfed seeds were often few.
No evidence of delayed SC was observed.
SC frequency correlated with mate availability, not population ID.

Conclusions:

Mate limitation, rather than low ID, appears to drive SC evolution in R. reptans.
Small populations with fewer mates may favor partial SC and mixed mating systems.
Findings contribute to understanding plant mating system dynamics.