Judgements of ordinality and summation of number symbols by squirrel monkeys (Saimiri sciureus).

@article{Olthof1997JudgementsOO,
  title={Judgements of ordinality and summation of number symbols by squirrel monkeys (Saimiri sciureus).},
  author={Anneke Olthof and C M Iden and William A Roberts},
  journal={Journal of experimental psychology. Animal behavior processes},
  year={1997},
  volume={23 3},
  pages={325-39}
}
In Experiment 1, 2 squirrel monkeys (Saimiri sciureus) were given choices between all possible pairs of the arabic numbers 0, 1, 3, 5, 7, and 9, with choice of any number yielding that number of pieces of peanut as a reward. Both monkeys learned to choose the larger number in all pairings and learned to choose the largest number within a set of 4 numbers. In Experiments 2-4, the monkeys were tested on problems in which they chose between pairs of stimuli containing 2 numbers versus 2 numbers, 1… CONTINUE READING