Now showing items 1-4 of 4

    • Chimpanzees return favors at a personal cost. 

      Schmelz, M; Grueneisen, S; Kabalak, A; Jost, J; Tomasello, Michael (Proc Natl Acad Sci U S A, 2017-06-19)
      Humans regularly provide others with resources at a personal cost to themselves. Chimpanzees engage in some cooperative behaviors in the wild as well, but their motivational underpinnings are unclear. In three experiments, ...
    • Differences in the early cognitive development of children and great apes. 

      Wobber, V; Herrmann, E; Hare, Brian; Wrangham, R; Tomasello, Michael (Dev Psychobiol, 2014-04)
      There is very little research comparing great ape and human cognition developmentally. In the current studies we compared a cross-sectional sample of 2- to 4-year-old human children (n=48) with a large sample of chimpanzees ...
    • Early social exposure in wild chimpanzees: mothers with sons are more gregarious than mothers with daughters. 

      Goodall, Jane; Lonsdorf, EV; Miller, JA; Murray, CM; Pusey, AE; Stanton, MA; Wellens, KR (Proc Natl Acad Sci U S A, 2014-12-23)
      In many mammals, early social experience is critical to developing species-appropriate adult behaviors. Although mother-infant interactions play an undeniably significant role in social development, other individuals in ...
    • Social disappointment explains chimpanzees' behaviour in the inequity aversion task. 

      Clift, JB; Engelmann, JM; Herrmann, E; Tomasello, Michael (Proc Biol Sci, 2017-08-30)
      Chimpanzees' refusal of less-preferred food when an experimenter has previously provided preferred food to a conspecific has been taken as evidence for a sense of fairness. Here, we present a novel hypothesis-the social ...