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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Sixty years ago, scientists embarked on an experiment to teach American Sign Language to chimpanzees—and ultimately prove humans ...

New research on chimpanzees is forcing scientists to rethink where the line between human and animal minds really lies. In carefully designed experiments, chimps are not just grabbing at treats or ...

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 ...

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

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, ...

What would a chimpanzee do if you handed it a glittering quartz crystal? Apparently, the same thing many of us would—hold ...

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 ...