Determination might be a very human expression

Humans might be using facial expressions of determination as a call for help from others, according to new research. When children and chimpanzees were both given a task that was impossible to solve, children's faces expressed determination or frustration the more they tried to solve the task, but chimpanzees did not. The facial expressions shown by the children -- chin raised and lips pressed together -- could signal effort or frustration, according to a researcher who said it is possible humans have evolved to use these facial expressions to solicit help from others.

Read the whole article on Science Daily

More from Science Daily