As babies develop, their cries turn into babbles, which soon form distinguishable words. That process involves some physical changes, to be sure, but also plenty of feedback from Mom and Dad—all that baby talk does a brain good! This feedback process was long thought to be human-specific, but Princeton University researchers have discovered it in another animal: marmoset monkeys.
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Key Facts In This Video
Initially, capuchin monkeys are happy to be rewarded with a cucumber for performing the same task. 00:20
A capuchin monkey will become visibly upset if it sees that its comrade is getting a better reward for a task that both have performed. 00:42
Chimpanzees have been known to reject a reward if they see that another chimp has received a worse one. 00:58
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