The chimpanzees spontaneously helped the reaching person regardless of whether this yielded a reward or not.

All those years he spent as the conductor of his father's orchestra have yielded their rewards.

For 66 minutes, there had been frustration that their probing had not yielded reward.

The singer's low-key approach always yields rewards, his semi-conversational style refreshingly free of any faux-showbiz embellishments.

The player also receives optional orders: should they be accepted, the characters receive a temporary power boost, and completing the objectives yields rewards.