David Brook du New Yorker fait une splendide synthèse de ces connaissances en imaginant deux personnages, Harold et Erica.

Extraits:

« I’ll call him Harold. His inner-mind training began before birth. Even when he was in the womb, Harold was listening for his mother’s voice, and being molded by it. French babies cry differently from babies who’ve heard German in the womb, because they’ve absorbed French intonations before birth. Fetuses who have been read “The Cat in the Hat” while in the womb suck rhythmically when they hear it again after birth, because they recognize the rhythm of the poetry. »

« When Harold was about eleven months old, his mother realized that she knew him better than she’d ever known anybody, even though they’d never exchanged a word. »

« Harold and Erica got their first glimpse of each other in front of a Barnes & Noble. They smiled broadly as they approached, and a deep, primeval process kicked in. Harold liked what he saw, from the waist-to-hip ratio to the clear skin, all indicative of health and fertility. He enjoyed the smile that spread across Erica’s face, and unconsciously noted that the end of her eyebrows dipped down. The orbicularis-oculi muscle, which controls this part of the eyebrow, cannot be consciously controlled, so, when the tip of the eyebrow dips, that means the smile is genuine, not fake. »

« Erica was impressed by him: women everywhere tend to prefer men who have symmetrical features and are slightly older, taller, and stronger than they are. But she was more guarded and slower to trust than Harold was. That’s in part because, while Pleistocene men could pick their mates on the basis of fertility cues discernible at a glance, Pleistocene women faced a more vexing problem. Human babies require years to become self-sufficient, and a single woman in that environment could not gather enough calories to provide for a family. She was compelled to choose a man not only for insemination but for continued support. That’s why men leap into bed more quickly than women. Various research teams have conducted a simple study. They hire a woman to go up to college men and ask them to sleep with her. More than half the men say yes. Then they have a man approach college women with the same offer. Virtually zero per cent say yes. »