|A conditional (…) is not a creature of constant hue, but chameleon-like,
takes on the colour of its surroundings: its meaning is determined
to some extent by the very propositions it connects.
|P.C. Wason and P.N. Johnson-Laird (1972), Psychology of reasoning: Structure and content, p. 92|
|Conditionals are acceptable in virtue of a number of different patterns of dependence (…)
If we have no pattern of dependence in mind, a primary object of our investigation
should then be to get one in mind.
|D.H. Sanford (1989): If P, then Q: Conditionals and the foundations of reasoning, p. 196ff|
[Copyright neth.de, 1999]:
Hans Neth and Sigi Beller (1999):
How knowledge interferes with reasoning: Suppression effects by content and context. Paper presented at CogSci 1999.
Hansjörg Neth, Sieghard Beller
Abstract: The suppression of logically valid inferences by the content or context of premises can be seen as an instance of knowledge having a detrimental influence on reasoning. Although Henle (1962) has claimed that invalid deductions are due to additional premises drawn from background knowledge, current research on content effects ignores the methodological implications of this claim. Elaborating on the suppression effect in conditional reasoning (Byrne, 1989), we present a knowledge-based approach that makes relevant features of background knowledge an integral part of the analysis. After identifying the sufficiency and necessity of conditions as the type of knowledge mediating the effect, we construct and validate task materials independently from any assessment of reasoning (Experiment 1). We then replicate and extend suppression effects in syllogism tasks (Experiment 2) and show that participants are able to couch their background knowledge in formally correct wordings (Experiment 3).
Keywords: Logic, thinking and reasoning, conditional syllogisms, effects of knowledge, content, context.
Reference: Neth, H., & Beller, S. (1999). How knowledge interferes with reasoning: Suppression effects by content and context. In M. Hahn, & S. C. Stoness (Eds.), Proceedings of the 21st Annual Meeting of the Cognitive Science Society (pp. 468–473). Mahwah, NJ: Lawrence Erlbaum.
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