Dating the origin of language using phonemic diversity

Area of Science:

• Linguistics
• Evolutionary Anthropology
• Archaeology

Background:

• The evolutionary timeline of human language remains unknown.
• Understanding language origins is crucial for comprehending human adaptation.
• Previous research has not established a definitive period for language evolution.

Observation:

• Phonemic diversity in languages evolves slowly, acting as a potential evolutionary clock.
• The colonization of Southeast Asia and the Andaman Islands provides a natural experiment to assess the rate of phonemic diversity increase.
• Existing African languages exhibit phonemic diversity that suggests a long evolutionary history.

Findings:

• Estimates suggest that present-day languages originated in Africa during the Middle Stone Age.
• The rate of phonemic diversity increase was calculated using data from human migrations.
• The findings support archaeological evidence for complex human behavior evolving in the Middle Stone Age.

Implications:

• Language is likely an older human adaptation than previously suggested.
• This research challenges the view of language as a recent driver of human dispersal.
• Further research is needed to test assumptions and expand the case study.