Abstract
ABSTRACTThe Principle of Contrast, that different words have different meanings, holds for adult language use. But at what age do children assume Contrast ? Do they rely on it from the start, or do they assume that new words may have the same meaning (the Null Hypothesis) until they discover otherwise ? Both the Null Hypothesis and Contrast have certain consequences. The Null Hypothesis places a heavy burden on languagelearners, whereas children could discover Contrast as part of their experience of rational behaviour. Examples that have been claimed to go counter to Contrast fall into two groups. Those in the first do not in fact violate Contrast at all. Those in the second rely on sameness of extension instead of sameness of meaning, and so are indeterminate as counter evidence. Usage consistent with Contrast, on the other hand, is pervasive in children's speech from an early age.
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