Reading focus
Syllabus: How Does Evolution Help Explain Behavior?
Identify the model's objective and constraints, and examine when the authors propose setting mechanisms aside.
Why you’re reading it. Provide a testable adaptive framework for human variation while making its assumptions open to criticism.
A question to consider. Could two communities reach similarly beneficial food practices through different learning histories, and what would a model of present benefits leave unexplained?
Why this reading
An evolutionary approach can predict variation with local conditions rather than one invariant human behavior. Nettle and colleagues explain human behavioral ecology and review its research practices. The article makes explicit the assumptions connecting ecological opportunities, behavioral strategies, and outcomes related to fitness.
Before you read
Ecology here includes social conditions and an individual's circumstances. Fitness concerns reproductive consequences, not health, happiness, or moral worth. Studies often measure a proxy such as energetic return or survival. An optimality model predicts a strategy under stated costs, benefits, and constraints. The behavioral gambit provisionally sets some mechanisms aside to generate predictions.
Read for
- Identify the model, outcome currency, and available alternatives in an example. Which assumptions would make its prediction informative?
- Examine the review's 17-journal search and exclusions, then the discussion of mechanisms, culture, and departures from optimality. Does the evidence characterize the whole field or a defined portion?
Consider afterwards
- When a prediction fails, what would distinguish a missing constraint from an explanation revised only to accommodate the result?
- Could different histories of social learning produce similar present benefits? What would a functional comparison leave unanswered?
Editorial context
This 2013 review samples empirical work from 2000–2011 and advocates one approach; it is not a current census of evolutionary psychology. Brown's commentary challenges postponing mechanisms, while the authors' reply ties the needed level of explanation to the question. Adaptive predictions remain hypotheses, and observations of contemporary benefit do not establish a genetic origin.