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| Research article summary (published 29 Apr 2006): |
Dual-goal facilitation in Wason's 2-4-6 task: what mediates successful rule discovery?
Full Abstract
The standard 2-4-6 task requires discovery of a single rule and produces success rates of about 20%, whereas the dual-goal (DG) version requests discovery of two complementary rules and elevates success to over 60%. The experiment examined two explanations of DG superiority: Evans' (1989) positivity-bias account, and Wharton, Cheng, and Wickens' (1993) goal-complementarity theory. Two DG conditions were employed that varied the linguistic labelling of rules (either positively labelled Dax vs. Med, or mixed-valence "fits" vs. "does not fit"). Solution-success results supported the goal-complementarity theory since facilitation arose in both DG conditions relative to single-goal tasks, irrespective of the linguistic labelling of hypotheses. DG instructions also altered quantitative and qualitative aspects of hypothesis-testing behaviour, and analyses revealed the novel result that the production of at least a single descending triple mediates between DG instructions and task success. We propose that the identification of an appropriate contrast class that delimits the scope of complementary rules may be facilitated through the generation of a descending instance. Overall, our findings can best be accommodated by Oaksford and Chater's (1994) iterative counterfactual model of hypotheses testing, which can readily subsume key elements of the goal-complementarity theory.
Author information
Author/s: Gale, Maggie (M); Ball, Linden J (LJ);
Affiliation: University of Derby, Derby, UK.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Quarterly journal of experimental psychology (2006) (Q J Exp Psychol (Colchester)), published in England. (Language: eng)
Reference: 2006-May; vol 59 (issue 5) : pp 873-85
Dates: Created 2006/04/12; Completed 2006/08/11; Revised 2006/11/15;
PMID: 16608752, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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