Thinking and Reasoning 5 (3):193 – 243 (1999)

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Abstract
Four experiments investigated the effects of probability manipulations on the indicative four card selection task (Wason, 1966, 1968). All looked at the effects of high and low probability antecedents (p) and consequents (q) on participants' data selections when determining the truth or falsity of a conditional rule, if p then q . Experiments 1 and 2 also manipulated believability. In Experiment 1, 128 participants performed the task using rules with varied contents pretested for probability of occurrence. Probabilistic effects were observed which were partly consistent with some probabilistic accounts but not with non-probabilistic approaches to selection task performance. No effects of believability were observed, a finding replicated in Experiment 2 which used 80 participants with standardised and familiar contents. Some effects in this experiment appeared inconsistent with existing probabilistic approaches. To avoid possible effects of content, Experiments 3 (48 participants) and 4 (20 participants) used abstract material. Both experiments revealed probabilistic effects. In the Discussion we examine the compatibility of these results with the various models of selection task performance.
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DOI 10.1080/135467899393986
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References found in this work BETA

Deduction.P. N. Johnson-Laird & R. M. J. Byrne - 1991 - Psychology Press.
The Logic of Scientific Discovery.K. Popper - 1959 - British Journal for the Philosophy of Science 10 (37):55-57.

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Citations of this work BETA

Why Do Humans Reason? Arguments for an Argumentative Theory.Dan Sperber - 2011 - Behavioral and Brain Sciences 34 (2):57.
Intuitive and Reflective Inferences.Hugo Mercier & Dan Sperber - 2009 - In Keith Frankish & Jonathan St B. T. Evans (eds.), In Two Minds: Dual Processes and Beyond. Oxford University Press. pp. 149--170.
The Probabilistic Approach to Human Reasoning.Mike Oaksford & Nick Chater - 2001 - Trends in Cognitive Sciences 5 (8):349-357.

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