Recognizing a fellow human ’s look is about more than just identify a nose or sassing . It ’s trust we apply something shout configural recognition to process the entire facial structure all in all , which is why there ’s often a little minute of a lag sentence when we see a nerve upside - down ( humans have an easier time recognise other physical object , like railcar or houses , that have been flipped ) .
Researchers now believe chimpanzees have something similar to configural recognition . Only they use it to recognise each other ’s butt .
In apaperpublished in the journalPLOS One , researcher from the Netherlands and Japan observed chimps as they examined photographs of archpriest bottom and act a pas seul on the “ match ” secret plan , coupling two indistinguishable butts together on a touch blind . They appeared dull to recognize prat when the images were rotated 180 degrees , indicating they rely on the same configural cue humans do . The researcher also carried out experimentation on world , who ( as expected ) took a long prison term to process images of human face riffle upside - down , but whose chemical reaction prison term did n’t change significantly when they were presented with upside - down image of human behinds .
It ’s believe chimps have germinate to focus on butts due to their proximity to them while actuate in groups . walk on four leg , they ’re often ( literally ) faced with a stern ahead of them . Since ovulating female normally have red , egotistic rearward ends , male chimps benefit from being able-bodied to identify them . What ’s more , chimps can typically break an ovulating non - relative from a congener , preclude inbreeding .
The paper conclude , " The findings paint a picture an evolutionary transmutation in socio - sexual signalling social occasion from buttocks to faces , two hairless , symmetrical and attractive body voice , which might have attuned the human nous to process faces , and the human expression to become more behind - like . "
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