Tickled Apes Reveal the Rhythmic Roots of Laughter

New scientific research offers fascinating insights into the origins of laughter and how it has evolved across different species. This comparative investigation focused on great apes, including chimpanzees, gorillas, and orangutans, alongside human children. The primary goal was to understand the deep evolutionary roots of human laughter by observing our closest living relatives.

To study their laughter-like vocalizations, researchers gently tickled the apes and human infants. They carefully recorded and analyzed the sounds produced during these playful interactions. A key finding was the rhythmic nature of these sounds. Unlike normal speech, which often involves a continuous outward flow of breath, laughter in both apes and humans frequently uses short, repeated bursts of in-and-out breathing. This 'pulsed' vocal pattern suggests a shared mechanism for producing playful sounds.

The similarities in laughter patterns among such diverse species indicate that this form of communication likely originated in a common ancestor many millions of years ago. This ancient, rhythmic breathing pattern, first observed in playful vocalizations, might be a crucial step in the evolutionary pathway that eventually led to complex human speech. The study highlights that the ability to control breath in a rhythmic way, essential for producing different speech sounds, may have its very early beginnings in the shared experience of laughter and play.