The Social Display Ladder. Cultural display, which frequently contradicts biological logic, moves through phases before jumping to the next level. The result is a species that seems to defy so much of biology and nature itself.
The linguist Judy Kegl who studied the birth of Nicaraguan Sign Language lists love of rhythm as the most basic instinct supporting the rise of language. (See: 4 Instincts Lead the Way) A paper just published in Social Cognitive and Affective Neuroscience by Charles Whitehead, "The Culture-Ready Brain" (abstract) proposes that culture, or at least cultural display, began with "dance and role play," timing, and performance. So is that point—rhythm and prosody—the point where culture and language first meet?