The easier mazes consisted of having to only move in one direction, whereas the more difficult mazes consisted of having to move in the opposite direction for successful completion. Another test consisted of a similar task for the human children. The twenty-seven children participating ranged in age from twenty-eight months to sixty-six months of age. They were all presented with identical mazes as their non-human counterparts. The children received visual and auditory rewards rather than treats. The human children were as successful as the chimpanzees in the tests. They also expressed verbally when they saw a trap, indicating that human cognition is bolstered by our abilities to communicate. The implications of this study revolve mainly around the idea that chimpanzees and children show similar amounts of cognitive function in regards to planning and inhibition. Inhibition is the ability to self-control oneself based on rational rather than instinct. In this case the chimpanzees had to inhibit their instinct to continue in a singular direction through the maze after planning a route. The monkeys lacked this ability for