Overview
- A peer‑reviewed study published Thursday, June 25, 2026 in Communications Biology found that all living great apes produce laughter with evenly spaced rhythmic intervals, a pattern the authors infer dates to a common ancestor about 15 million years ago.
- Researchers reached this conclusion by reanalyzing archival tickle recordings from captive orangutans, chimpanzees, bonobos and gorillas and comparing them with newly recorded giggles from four young children.
- The team also reports that human laughter is faster, more variable, and more under voluntary or contextual control than ape laughter, suggesting added timing flexibility evolved in our lineage.
- Experts warn the dataset is small and skewed to captive contexts, and they call for more recordings from more individuals, species and natural social situations to confirm the pattern and its timing.
- If confirmed, the result would support a gradualist view of vocal evolution by using laughter as a living trace of shifting vocal control when sounds leave no fossils, and it could prompt broader cross‑species acoustic studies to test links between laughter and speech origins.