The association between working memory and jumping to conclusions: A systematic review and meta-analysis.

Jumping to conclusions (JTC) is a reasoning bias that has been linked to delusions.Studies have explored the contribution of impaired working memory to JTC, but this research has yet to be synthesized.A systematic review and two multilevel meta-analyses were conducted to quantify the association between working memory and JTC.One meta-analysis included correlational studies, whereas the other included studies comparing working memory among people with and without JTC biases.Metaregressions tested the moderating effects of clinical status and JTC task difficulty in the correlation meta-analysis.Twenty-three studies (N 5 2,058) met the inclusion criteria.A small but significant pooled effect for the association between working memory and JTC was present across correlational studies (k 5 30; Fisher's z 5 0.16, 95% confidence interval [CI; 0.09, 0.23], p < .001).There was also a significant pooled effect across studies when comparing working memory performance among people with JTC biases to those without (k 5 44; Hedges' g 5 À0.43, 95% CI [À0.51,À0.34], p < .001).There was inconclusive evidence of moderation by clinical status or task difficulty.Findings were limited by differences in the way JTC was operationalized and measured across studies, requiring included studies to be divided between two meta-analyses and reducing statistical power. General Scientific SummaryPeople with delusions tend to make decisions quickly based on limited information, a thinking style called "jumping to conclusions."Reduced working memory has been proposed to contribute to this thinking style.This meta-analysis provides evidence that reduced working memory is consistently linked to jumping to conclusions.