How can evolutionary explanations of human behaviour be tested?

For: Readers who want to distinguish an evolutionary research question from an attractive story about why people behave as they do.

An evolutionary explanation needs more than a story about how a behaviour might have been useful. Begin by asking which question the explanation addresses. How does the behaviour arise now? How does it develop? What is its evolutionary history? What function might help explain its persistence? The comparative-cognition methods entry provides a framework for separating such questions. They can inform one another, but evidence for one does not automatically answer the rest.

Collard’s ethnology session offers a concrete methodological position: cross-cultural evidence can contribute to interpreting human origins. Treat this as a proposal about how to learn, not as permission to choose any present-day group as a picture of the distant past. Ask what is being compared, how cases were selected and which alternative histories could produce a similar pattern. An analogy becomes informative only when its relevant similarities and differences are stated.

Move next to Fernandez-Duque’s monkey field research. The session abstract describes long-term research and competing explanations involving ecology, mating and care. This is a useful example because the explanatory alternatives can be written down before selecting a favourite. For each account, ask which observation would be expected more strongly under that account than under its rivals. Merely showing that a behaviour is compatible with an explanation is a weaker achievement.

Rilling’s grandmaternal-love session introduces another proposed evolutionary function. Separate evidence about contemporary grandmothers, an account of their psychological or neural responses, and the historical claim about why a capacity evolved. The guide does not treat the hypothesis as proven. Gettler’s cross-cultural fatherhood discussion is a complementary reminder to ask how ecology and social roles enter an account of present variation.

Marchetto’s work changes the level of explanation again. Her abstract asks about molecular regulation of developmental timing and explicitly identifies unresolved mechanisms. Moffett’s comparison concerns social organisation across very different kinds of organisms. Neither should be inserted into a single chain in which a molecule explains a society. Instead, use them to practise labelling what each observation could support and what bridging argument would still be needed.

For the final exercise, choose one explanation and formulate two alternatives. One might concern learning or current ecological conditions; another might concern a different proposed historical function. Write a prediction that would distinguish each pair, then identify what data would be needed and what practical limits would remain. You need not design a complete study. The learning goal is to transform “this would make sense” into a claim with stated assumptions, informative comparisons and a possible failure. That discipline makes evolutionary questions more demanding and more useful.

Next step

Use the social-attachment guide to examine one related set of hypotheses in greater detail, retaining the distinction between present mechanisms and historical function.

Limits of this route

The route combines 2023 and 2025 CARTA session abstracts with a 2023 methods entry. The inspected abstracts establish speakers’ questions and proposals, not independent verification of all cited studies. Historical functions, molecular mechanisms and present cross-cultural patterns remain distinct. No claim is made that current societies reproduce an ancestral condition.