One Cartesian reason for taking thought to be independent of language—or to have its own ‘Language of thought’—is that language is subject to massive cross-linguistic variation, while thought is not. So Chapter 5 addresses the issue of cross-linguistic variation: its dimensions, and its extent. Does it provide a challenge for our account of universal grammar? Not inasmuch as the primary dimension of variation is the organization of language at a lexical and morphological level; not, if what have traditionally been thought of as syntactic parameters actually reduce to variation in modes of externalization.
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