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Without Good ReasonThe Rationality Debate in Philosophy and Cognitive Science$
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Edward Stein

Print publication date: 1997

Print ISBN-13: 9780198237730

Published to Oxford Scholarship Online: October 2011

DOI: 10.1093/acprof:oso/9780198237730.001.0001

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Psychological Evidence

Psychological Evidence

Chapter:
(p.79) 3 Psychological Evidence
Source:
Without Good Reason
Author(s):

Edward Stein

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198237730.003.0003

The primary evidence for the irrationality thesis – the view that humans have an underlying ability to reason that is appropriately characterized by principles that diverge from the normative principles of reasoning – comes from psychological research concerning human reasoning. Such research is supposed to show that humans systematically violate basic principles of reasoning. This chapter reviews two important psychological experiments. The first concerns whether we reason in accordance with principles of reasoning based on rules of logic, and the second concerns whether we reason in accordance with principles of reasoning based on rules of probability theory. Both experiments seem prima facie to provide evidence that human reasoning competence diverges from the normative principles of reasoning. As part of the discussion of each experiment, the chapter also examines particular instances of a general strategy to reconcile such experimental results with the rationality thesis.

Keywords:   irrationality thesis, reasoning, normative principles, experiments, humans, logic, probability theory, rationality thesis

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