Experimental studies of traditions and underlying transmission processes in chimpanzees

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Ratcheting up the ratchet: on the evolution of cumulative culture (2009, background): “(2005) on another pair of captive chimpanzee groups, the results were not as clear-cut (Hopper et al. 2007).”
Reply to comments. Two Key Steps in the Evolution of Human Cooperation: The Interdependence Hypothesis (2012, result): “Moreover, a subsequent study with a different chimpanzee group failed to replicate this result (Hopper et al. 2007).”
Emulation, imitation, over-imitation and the scope of culture for child and chimpanzee (2009, methodology): “The 'one innovator, 30þ social learners' of our panpipes studies (Whiten et al. 2005a; Hopper et al. 2007) serves as one apt illustration of the zone conducive to the emergence of traditions (Zone 2) hypothesized in figure 3.”
A demographic model for Palaeolithic technological evolution: The case of East Asia and the Movius Line (2010, background): “…of behaviour that are socially learned, transmitted and inherited between individuals and groups over generations of time (Whiten et al., 1999, 2005, 2007; McGrew, 2004, 2007; Biro et al., 2006; Horner et al., 2006; Perry, 2006; Bonnie et al., 2007; Hopper et al., 2007; Lycett et al., 2007).”
Two Key Steps in the Evolution of Human Cooperation (2012, result): “Moreover, a subsequent study with a different chimpanzee group failed to replicate this result (Hopper et al. 2007).”