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.

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 ...

Chimps’ love for crystals could help explain our ancestors’ fascination with the shiny stones. The forerunners of modern humans collected crystals for which they had no apparent use, say scientists.

The crystal chimp study, published in the journal Frontiers in Psychology, was an attempt to understand what about the shimmering minerals is so attractive to the apes’ closest cousins, us. It was led ...

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, ...

Why the Latest Science Leads Us to a New Theory of Human Nature, by Jonathan Leaf (Bombardier, 320 pp., $21) Ever since Darwin, biologists have believed that much could be learned about human nature ...

The National Institutes of Health wants you to believe that chimpanzee experimentation is necessary. It so badly wants you to believe this that the agency just two months ago began to use your tax ...

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 ...