Linguistic barriers to logical reasoning: a new perspective on Aristotelian syllogisms

Experimental studies investigating logical reasoning performance show very high errorrates of up to 80% and more. Previous research identified scalar inferences of the sentencesof logical arguments as a major error source. We present new analytical tools to quantify theimpact of scalar inferences on syllogistic reasoning. Our proposal builds on a new classificationof Aristotelian syllogisms and a closely linked classification of reasoning behaviors/strategies.We argue that the variation in error rates across syllogistic reasoning tasks is in part due toindividual variation: reasoners follow different reasoning strategies and these strategies playout differently for syllogisms of different classes.Keywords: syllogisms, reasoning errors, individual variation, scalar inferences.