How Is Chimpanzee Self-Control Influenced by Social Setting?

Figure 3

Chimpanzee performance in a joint accumulation test as a function of whether the partner animals were housed together or in separate adjacent enclosures. In both cases, chimpanzees’ accumulation tubes were within reach (items accumulated in the together-out-of-reach condition was out of the chimpanzees’ control). Error bars represent the Standard Error of the Mean.