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8h ago

Great Apes and Humans Share a 15‑Million‑Year Laughing Rhythm

Researchers say a consistent, evenly spaced timing in ape and human laughter provides a measurable ‘vocal fossil’ that traces stepwise gains in vocal timing control toward speech.

Orangutan smiling. Credit: Marina Davila-Ross
FILE - A bonobo holds her baby at the Lola ya Bonobo sanctuary in Kinshasa, Democratic Republic of the Congo, on April 8, 2026. (AP Photo/Samy Ntumba Shambuyi, File)
FILE - A chimpanzee (Pan troglodytes) snuggles against his mother in the zoo in Leipzig, central Germany, Aug. 9, 2010. (AP Photo/Jens Meyer, File)
Orangutans, Gorillas, Chimps, And Bonobos All Laugh Just Like Humans. That Means We’ve Been Chuckling This Way For 15 Million Years

Overview

  • A University of Warwick study published June 25 analysed 140 laughter sequences and found all five living great ape species produce laughter with an isochronous, or evenly spaced, interval between successive vocal bursts.
  • The dataset combined archival zoo recordings of juvenile apes recorded mainly in 2004–2006 with new home recordings of four human children aged six months to seven years to measure tempo, variability and rhythmic regularity.
  • Researchers report that human laughter is faster and more variable and that only humans showed clear context-dependent modulation of tempo, which the authors link to greater voluntary vocal control.
  • Study authors and outside commentators note clear limits: small numbers of individuals per species, noisy archival audio, and captive-only ape samples restrict species-level claims and require larger, cross-site sampling to confirm evolutionary timing.
  • The team published their paper in Communications Biology with data and analysis scripts on Zenodo, and they say follow-up studies across more sites and species could test whether this rhythmic trait truly dates to the last common ancestor about 15 million years ago and how it relates to speech evolution.