Reading focus
Syllabus: How Are Cultures Learned, Transmitted and Changed?
Distinguish the proposed core criteria from the extended features of more elaborate cumulative change.
Why you’re reading it. Give the next experiment a set of claims to assess rather than an all-or-nothing label.
A question to consider. What evidence would let you classify an improving community recipe as transmitted change, cumulative improvement or repeated individual discovery?
Why this reading
Mesoudi and Thornton separate the components of cumulative cultural evolution so that claims about it can be tested more precisely. Their framework distinguishes repeated improvement through social transmission from additional features such as recombination and changes in a trait’s function.
Before you read
Cultural transmission alone need not improve performance. A claim of improvement needs an explicit outcome, such as efficiency on a task, and does not imply moral progress or greater human worth. The authors distinguish a proposed core definition from extended features found in more elaborate cases.
Read for
- Apply the core criteria—change, social transmission, improved performance and repetition—to the examples instead of treating any stable tradition as cumulative.
- Ask what each experiment or model establishes about functional dependence, diversification, recombination, exaptation or changes to the environment in which traits succeed.
Consider afterwards
- Could a simpler tool satisfy the proposed criteria if it performed better and its improvement was transmitted?
- What would distinguish repeated individual discovery from a cumulative history in a group?
Editorial context
The criteria are an explicit proposal for clarifying a contested concept. The review’s comparisons across humans and other animals describe the evidence available in 2018, not a permanent boundary between species. Laboratory gains remain dependent on task structure, learning time and comparison conditions. Miton and Charbonneau’s methodological discussion explains why laboratory performance and achievements beyond individual invention need to be distinguished.