The Faculty of Language: What Is It, Who Has It, and How Did It Evolve?
Abstract
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RE: Human Pleistocene littoral past helps explain speech evolution
Thanks for this, but recent insights in human evolution - more specifically our Pleistocene littoral evolution (e.g. Peter Rhys-Evans 2020 "The waterside ape" CRC Press) - help understand how human speech evolved: different biological preadaptations to spoken language find their origin in our waterside past, e.g. our large brain (cf DHA & other brain-specific nutrients in seafoods), voluntary breathing (breath-hold diving for shellfish etc.) & suction feeding of soft-slippery sea-foods. Suction feeding explains why humans (vs other hominoids) evolved hyoidal descent (tongue-bone descended in the throat), closed tooth-rows (with incisiform canine teeth) & a globular tongue perfectly fitting in our vaulted & smooth palate (without transverse ridges as in apes): all this allowed the pronunciation of consonants. Other, probably older, preadaptations to human speech are territorial songs & gibbon-like duetting (Darwin 1871) & vocal learning. Vocal learning, the ability to imitate sounds - as in many birds & bats & a number of Cetacea & Pinnipedia - is arguably required for locating or finding back (amid the foliage, on the beach, in the water ...) the offspring or parents. Indeed, independent lines of evidence (comparative, fossil, archeological, paleo-environmental, isotopic, nutritional & physiological) show that early-Pleistocene "archaic" Homo spread intercontinentally along the Indian Ocean shores (they even reached overseas islands such as Flores) where they regularly dived for littoral foods such as shell- and crayfish (e.g. J.Joordens et al.2015 "Homo erectus at Trinil on Java used shells for tool production and engraving" 2015 Nature 518:228-231) which are extremely rich in brain-specific nutrients, explaining Homo's brain enlargement (Stephen Cunnane & Kathlyn Stewart eds 2010 "Human Brain Evolution: The Influence of Freshwater and Marine Food Resources" Wiley-Blackwell). Shallow-diving for seafoods requires voluntary airway control, a prerequisite for spoken language. Seafood such as shellfish generally does not require biting & chewing, but stone tools & suction feeding. This finer control of the oral apparatus was arguably another biological preadaptation to human speech, esp. for the production of consonants (M.Verhaegen & S.Munro 2004 "Possible preadaptations to speech, a preliminary comparative approach" Hum.Evol.19:53-70).