Yes, Darwin -- thanks, Athel. And it's even "Darwin Day", says Crystal,
though he's a bit vague about for-whom and since-when.
Crystal focuses on "accent differences". What is the evolutionary
advantage in people from different places or groups having different
ways of speaking?
"Perceiving identities in the dark would have been critical...when
speech was first emerging." Mm. Maybe, but I would think at that stage
it would have been recognition of individuals rather than groups.
He also connects it to modern times: "A street-wise young man once told
me he knew not to round a corner into a street, or go into a club or
pub, if he heard a particular accent being used there." Unfriendly
people, looking for a fight, I guess. But a long way from palaeolithic early-language situations.
But then I thought of Don Laycock (Australian linguist) who asked a
Sepik River man why all the people up and down the river, who seemed to
get along all right, didn't speak the same language. "That wouldn't be
good," was the answer, "We like to know where people come from." Laycock
also mentioned examples of Melanesians apparently deliberately tweaking
their local language in order to distinguish themselves from
neighbouring villages.
D.C.Laycock (1982) "Linguistic diversity in Melanesia: a tentative
explanation"
full reference here:
https://shs.hal.science/halshs-02935652/file/26_Schapper_EA_YM_FINAL.pdf
I used to cite Laycock regularly to students to make the point that, in Melanesia at least, linguistic differences were not seen as a problem,
and could even be useful.
So while I don't think accent differences _evolved_ to fit this
function, and I think most of them originate from ordinary sound change,
there is no doubt that they have long been useful in identifying members
of groups.
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