title: Clarifying the time frame and units of selection in the cultural group selection hypothesis.
abstract: We raise and discuss two issues for clarification. First, over what timescale is cultural group selection proposed to have been active? Unprecedented cooperation is inferred to have arisen in hunter-gather life well before the recent period on which Richerson et al.
  
  
  
  Second, what is the unit of selection? Groups (of human individuals)? Or cultural entities along the lines of "meme-complexes"?
authors: Centre for Social Learning and Cognitive Evolution,School of Psychology & Neuroscience,University of St. Andrews,St. Andrews KY16 9JP,United Kingdom.aw2@st-andrews.ac.ukwww.st-andrews.ac.uk/profile/aw2.
authors: Andrew
authors: A
authors: Whiten
authors: School of Management,University of St. Andrews,St. Andrews,KY16 9RJ,United Kingdom.david@erdal.org.uk.
authors: David
authors: D
authors: Erdal
mesh_terms: D006801:Humans; D007398:Interpersonal Relations