I usually take these monkey studies with a pinch of salt. It shouldn’t be to hard to conduct a similar study on humans, and the fact that we are only hearing about monkey studies makes me question whether the results can be generalized.

It is not just that we are a different species and exhibit different behavior under same circumstances as monkeys, but also that the monkeys are kept under captivity all their lives which will profoundly alter their behavior (the same applies to humans).