Numerical competence in a chimpanzee (Pan troglodytes).

@article{Boysen1989NumericalCI,
  title={Numerical competence in a chimpanzee (Pan troglodytes).},
  author={Sarah T. Boysen and Gary G. Berntson},
  journal={Journal of comparative psychology},
  year={1989},
  volume={103 1},
  pages={
          23-31
        }
}
A chimpanzee (Pan troglodytes), trained to count foods and objects by using Arabic numbers, demonstrated the ability to sum arrays of 0-4 food items placed in 2 of 3 possible sites. To address representational use of numbers, we next baited sites with Arabic numbers as stimuli. In both cases performance was significantly above chance from the first sessions, which suggests that without explicit training in combining arrays, the animal was able to select the correct arithmetic sum for arrays of… 
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