Criticism
Linguistics experts point out that Dunstan's hypothesis has not been subjected to rigorous testing or academic scrutiny. The Dunstan company had, at one time, developed a clinical trial plan with Brown University researchers to test its claims, but abandoned it for consumer surveys and small-group observations in order "to hasten the development of a system that could be used by parents," skipping rigorous testing to go straight to market.
Read more about this topic: Dunstan Baby Language
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