Chimpanzees appear to execute Rational Evidence-Weighing in complex decision-making tasks. The experiments conducted demonstrated that chimps changed their minds when presented with stronger evidence.

A series of stunning findings about great apes’ mental capabilities in recent years has transformed how we see our closest relatives ...

"The way they ‘studied' it there, turning it over to observe it from different angles, was amazing." ...

Some smaller crystals were never recovered at all. The findings, published March 3, 2026 in the journal Frontiers in ...

When caretakers tried to retrieve the crystal from the chimps’ enclosure, they had to exchange it for favoured snacks of bananas and yoghurt. A second experiment showed that the chimps could identify ...

And chimps outperform humans. I once watched Matsuzawa show videos of his experiments with Ai and Ayumu at a conference attended by the world’s leading chimp researchers, including Jane Goodall, ...

"We were pleasantly surprised by how strong and seemingly natural the chimpanzees' attraction to crystals was." ...

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Source: Ruben van Kuik, via Wikimedia Commons. How do scientists study the evolution of human culture and cognition? There aren’t any early hominins around—but there are chimpanzees, our closest ...

1) That the knowledge gained must be necessary to advance the public’s health; 2) There must be no other research model by which the knowledge could be obtained, and the research cannot be ethically ...

A recent study performed on chimpanzees demonstrates that chimpanzees possess cognitive flexibility similar to that of humans. When circumstances or evidence change, chimps appear to do the thing ...