Researchers out of Leiden University and Kyoto University used experiments based on the “inversion effect” for facial recognition. When chimpanzees are experts at recognizing something, such as other chimp-faces or human faces, they’re able to pick it out even if it’s flipped upside-down. Previous recognition studies, they write in their study published in PLOS, have examined every body part “except the most obvious one,” the butt. Obviously!“
The findings suggest an evolutionary shift in socio-sexual signaling function from behinds to faces, two hairless, symmetrical and attractive body parts, which might have attuned the human brain to process faces, and the human face to become more behind-like.” Our faces, our asses, our selves. [...]
As we evolved, faces, especially in females, grew to have redder, thicker lips and fattier cheeks. Our faces even blush as a signal for emotional or hormonal response, and can be interpreted as a socio-sexual cue.
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