Norm-making as in mimicking?

There was a study many years ago comparing problem-solving skills of human and chimpanzee children. From memory: 100 on each side. Each was given a Chinese puzzle of opaque drawers and sliding panels and such, in which there was a treat to be found. Both sides tried it at first, and then both sides were shown how to solve it. From that, all 200 could solve it again for another treat.

But then: a new puzzle was given, identical in appearance except this time the drawers and panels were all transparent and the treat was in a different drawer that could simply be opened directly for the treat. All 100 Chimps picked the puzzle up and examined it, then immediately opened the drawer and ate the treat. All 100 human children tried the same elaborate solution they had previously learned, and I think only 2 humans actually got to the treat after considerable frustration.

The ‘scientific’ conclusion was that this proved humans were more intelligent than Chimpanzees, because humans as a collective are more skilled at mimicking than Chimpanzees are. Note “skilled” rather than “persistent.”

I think this illuminating study might still be on YouTube somewhere.