The link between evolution and language | Richard Dawkins

Episode Summary

Executive Summary: Richard Dawkins and John McWhorter compare language evolution to biological evolution, arguing that both feature excess, drift, selection, and vestigial remnants. They discuss sexual selection, dialect/language boundaries, pseudogenes, chain shifts in pronunciation, and the hybrid nature of ancestral languages, using playful examples to show how communication systems change and diversify.

Main Topics: Excess and extravagance in communication (Priority: 5/5): McWhorter opens by comparing unnecessary linguistic features to biological ornamentation, and Dawkins links this to sexual selection, especially peacock tails and possibly human poetry as display. Vestiges, pseudogenes, and dead forms (Priority: 5/5): They discuss obsolete language elements like dead suffixes and compare them to junk DNA and pseudogenes, especially genes for smell that remain present but switched off in humans. Dialect vs. language and species boundaries (Priority: 4/5): McWhorter’s test for dialects—whether native speakers laugh or feel insulted—is extended to biology, with examples of frogs whose calls diverge more in overlap zones, analogous to social differentiation. Drift versus selection in change (Priority: 5/5): The conversation contrasts random drift in both language and evolution with selection-driven change, debating whether language change is mostly random or sometimes functionally shaped. Sound change, chain shifts, and disambiguation (Priority: 4/5): They explore how vowel shifts can cascade to preserve distinctions, but also how languages can become less clear over time, showing that change is not always adaptive. Proto-languages and hybridity (Priority: 5/5): Dawkins challenges the idea of a single pure Proto-Indo-European, arguing that ancestral languages were likely hybrid and mixed, much like biological lineages and bacterial genomes.

Key Arguments: Language often contains excess and redundancy, much like extravagant biological traits, and this can be explained by selection-like processes rather than pure utility. Sexual selection can produce exaggerated traits such as peacock tails; Dawkins suggests human poetry and performance may similarly function as mating displays. Vestigial language forms and pseudogenes both persist as remnants of once-functional systems, showing that evolution leaves behind dead material. Species and dialects can be distinguished by social reactions to imitation: ridicule or offense suggests a dialect boundary, while respect suggests a separate language. In zones where closely related species overlap, their signals may diverge more strongly, paralleling how dialects or species can exaggerate differences to maintain identity. Language change is partly drift-like and partly selection-like; some changes improve clarity, while others create confusion or homonyms. Proto-Indo-European was likely not a pure, single-origin language but a hybrid system shaped by contact and mixture, similar to biological ancestry. Bacterial evolution is especially analogous to language because it involves frequent cut-and-paste exchange across lineages.

Data Points: Number of future-tense examples in English: 4 - McWhorter cites 'will,' 'going to,' present tense with future meaning, and 'shall' as alternative ways to express the future. Frog species example: 2 species - Dawkins discusses Micrahyla carolinensis and Micrahyla olivacea as closely related North American frogs with different calls. Question words in English: 4 words - McWhorter references what, where, why, and when as a set that all begin with 'wh-'. Indo-European language family size: several dozen languages - Dawkins describes Indo-European as encompassing many languages across Europe and parts of India. Time reference for dead suffix use: long dead - McWhorter notes that the suffix '-ol' is no longer productive and only ancient Germanic speakers could have used it.

Pivotal Quotes: "There are other theories, but I think that's perhaps the nearest approach you get to what you want." — Richard Dawkins: On peacock tails as an analogy for extravagant, non-utilitarian features in communication and sexual selection. "The interesting thing is that we still have the genes that would make us have that kind of sense of smell. They've just been turned off." — Richard Dawkins: On human smell genes as pseudogenes, analogous to dead or vestigial language forms. "I suspect that it was never a pure language." — Richard Dawkins: On Proto-Indo-European as a hybrid rather than a single pristine ancestral language.

Implications: The conversation suggests that language, like life, evolves through a mix of drift, selection, and inheritance of leftovers. For listeners, it reframes speech as a living system shaped by competition, identity, and historical mixture.