Debiasing training improves decision making in the field

Date Issued
2019-09Publisher Version
10.1177/0956797619861429Author(s)
Sellier, Anne-Laure
Scopelliti, Irene
Morewedge, Carey K.
Metadata
Show full item recordPermanent Link
https://hdl.handle.net/2144/40086Version
Accepted manuscript
Citation (published version)
Anne-Laure Sellier, Irene Scopelliti, Carey K Morewedge. 2019. "Debiasing Training Improves Decision Making in the Field.." Psychol Sci, Volume 30, Issue 9, pp. 1371 - 1379. https://doi.org/10.1177/0956797619861429Abstract
The primary objection to debiasing-training interventions is a lack of evidence that they improve decision making in field settings, where reminders of bias are absent. We gave graduate students in three professional programs (N = 290) a one-shot training intervention that reduces confirmation bias in laboratory experiments. Natural variance in the training schedule assigned participants to receive training before or after solving an unannounced business case modeled on the decision to launch the Space Shuttle Challenger. We used case solutions to surreptitiously measure participants' susceptibility to confirmation bias. Trained participants were 29% less likely to choose the inferior hypothesis-confirming solution than untrained participants. Analysis of case write-ups suggests that a reduction in confirmatory hypothesis testing accounts for their improved decision making in the case. The results provide promising evidence that debiasing-training effects transfer to field settings and can improve decision making in professional and private life.
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