An experiment is reported which demonstrates the effects of linguistic and psychometric factors on adults’ performance on a propositional reasoning task. The three linguistic factors were the semantic content in which the logical rule was embedded, the linguistic form of the logical rule, and the polarity of the major premise of the logical arguments. The two psychometric factors were the mode of response and the order of presentation of the different types of content. The results showed that the linguistic factors had a pronounced effect on adults’ propositional reasoning abilities, whereas the influence of the psychometric factors was negligible. These findings are discussed in relation to operational and interpretational factors in reasoning.
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