Macaques can predict social outcomes from facial expressions

• DOI: 10.1007/s10071-016-0992-3
• Publication Date: 2016-05-07T10:24:21Z
• Authors: Bridget M. Waller; Jamie Whitehouse; Jérôme Micheletta
• Keywords: Expression (computer science)

There is widespread acceptance that facial expressions are useful in social interactions, but empirical demonstration of their adaptive function has remained elusive. Here, we investigated whether macaques can use the others to predict future outcomes interaction. Crested (Macaca nigra) were shown an approach between two unknown individuals on a touchscreen and required choose one potential outcomes. The actors manipulated last frame video. One subject reached experimental stage accurately predicted different depending which displayed. bared-teeth display (homologue human smile) was most strongly associated with friendly Contrary our predictions, screams threat faces not more conflict Overall, therefore, presence any expression (compared neutral) caused than negative Facial general, indicated reduced likelihood conflict. findings dispute traditional theories view only as indicators present emotion instead suggest form part complex interactions where think beyond present.