Representation of the numerosities 1-9 by rhesus macaques (Macaca mulatta).
Representation of the numerosities 1-9 by rhesus macaques (Macaca mulatta).
Three rhesus monkeys (Macaca mulatto) were trained to respond to exemplars of 1,2,3, and 4 in an ascending, descending, or a nonmonotonic numerical order (1-»2->3->4,4->3-*2-'1, 3-•!-»4->2).The monkeys were then tested on their ability to order pairs of the novel numerosities 5-9.In Experiment 1, all 3 monkeys ordered novel exemplars of …