Abstract
In a study of the effects of instructions on reaction times to judgments of the truth or falsity of sentences, 40 undergraduates were provided computer-assisted instruction by either the 'true' or 'conversion' model and required to judge 64 sentences of all possible combinations of true or false, affirmative or negative, and expletive or nonexpletive. The pattern of reaction times corresponded exactly to that predicted by the type of instructions, including the reaction times to expletive sentences, which extends the range of syntactic structures to which the models apply. Such experimental control has implications for a broad range of methodological problems in cognitive psychology.
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