Using adult speakers' intuitions, derived from grammatical/acceptability judgement tests, to verify linguistic theories is common practice. This paper presents some recent experimental data, from both native and non-native speakers, from judgements of sentences containing different degrees of ungrammaticality (wh-movement). The results show that both groups of respondents, using the technique of magnitude estimation, are sensitive to degrees of ungrammaticality, and also to parametric variation (sentences which are grammatical in one language, but not in the other).
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