Rate of language evolution is affected by population size

Area of Science:

• Linguistic Evolution
• Population Demography
• Computational Linguistics

Background:

• The impact of speaker population size on language evolution rates and patterns remains a subject of debate.
• Existing hypotheses suggest larger populations may innovate more, while smaller ones might diffuse innovations efficiently, or vice versa regarding feature loss.

Purpose of the Study:

• To empirically test the influence of population size on language evolution rates.
• To clarify the mechanisms of language change by examining demographic effects.
• To provide statistically robust data for reconstructing human cultural history.

Main Methods:

• Analysis of cognate word gain and loss rates in basic vocabulary across Polynesian languages.
• Control for the evolutionary history of the populations.
• Formal comparison of different language evolution models.

Main Results:

• Larger populations exhibit higher rates of new word (cognate) acquisition.
• Smaller populations demonstrate higher rates of word loss.
• Demographic factors significantly influence language evolution, with distinct effects on gain and loss rates.

Conclusions:

• Population size plays a crucial role in shaping language evolution.
• Rates of lexical gain and loss are differentially affected by population size.
• Findings align with theoretical predictions from evolutionary models.