Atmosphere and conversion errors in syllogistic reasoning.

Abstract
Tabulation of errors in syllogistic reasoning has led to alternative interpretations in terms of atmosphere effect and invalid conversion, but the data and the interpretations overlap. Syllogisms were arranged in separate scales to test each error separately, and different groups got brief training directed against each error separately. Both errors were measured with fair reliability, and in untrained groups the 2 were uncorrelated. Antiatmosphere training clearly reduced atmosphere errors, and anticonversion training apparently reduced conversion errors. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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