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Re:Study finds 'mother of all languages' (spoken in pre-hist... by athom on Saturday April 16, 2011 @01:48AM (#2453311)
there's no reason to think that we started out with lots of phonemes and that these have been whittled away over time

I suspect the reasoning is more along the lines of languages picking up more phonemes over time, such that older languages, having been around longer, would have picked up more phonemes.

Re:Study finds 'mother of all languages' (spoken in pre-hist... by Afton on Monday April 25, 2011 @03:08PM (#2482487)
Same problem. No reason to think that historical change is 'complexification' either. Lots of evidence in both directions.