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Chapter 13

Chapter 13 reading

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Gillian Rowe

PSY270 Lecture 11 Chapter 13 Reasoning and Decision Making Decisions: making choices between alternatives Reasoning: process of drawing conclusions, and as the cognitive processes by which people start with information and come to conclusions that go beyond that information o Deductive: involves sequences of statements called syllogisms. E.g. All robins are birds. o Inductive: arrive at conclusions about what is probably true based on evidence. Conditional reasoning: the Wason four-card problem (COGLAB) Classic reasoning problem o 4 cards shown, e.g. E K 4 7 o Each card has letter on one side and a number on the other side. o Task is to indicate which cards you need to turn over to test this rule: If there is a vowel on one side, then there is an even number on the other side. Results: o 53% of participants indicated E must be turned over. (correct, falsify rule) o 46% indicated that 4 would be needed (in addition to E). (incorrect, tells us nothing about rule) o 4% got correct answer 7. Key: falsification principle to test a rule, it is necessary to look for situations that would falsify the rule. Inductive reasoning: reaching conclusions from evidence premises based on observation generalization Nature of inductive reasoning conclusions are suggested, decide how strong argument is. Use past experiences to guide present behaviour (shortcuts), which take the form of heuristics. Heuristics rule of thumb that are likely to provide the correct answer to a problem. NOT FOOLPROOF. Availability heuristic states that events that are more easily remembered are judged as being more probable than events that are less easily remembered. o Example: which is more prevalent words beginning with r, or words with r as third letter? (latter) o Example: which are the more common causes of death in the US Explanation of misjudgements linked to availability. o McKelvie: presented list of 26 names to participants. Conditions: famous men 12 famous men, 14 non famous women famous women 12 famous women, 14 non famous men participants asked to estimate whether there were more males or females answer depended to which condition they were exposed to. This was because famous names easier to remember, stands out more. (availability) Illusory correlations occur when a correlation bw 2 events appear to exist but there is noneweak. o E.g. stereotypes. Representativeness heuristic related to idea that people make judgments based on how one event resembles another. Probability that A is a member of class B can be determined by how well properties of A resemble B. Tversky and Kahneman : 1 www.notesolution.com
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