This study examined relationships between positive affect and jumping to conclusions (JTC) in delusional thinking. One hundred and eighty-nine non-clinical participants entered an internet experiment and were randomized into one of two conditions. Those in a positive condition performed online creativity tasks and received bogus positive feedback as part of a positive affect induction procedure, whilst a neutral condition received neutral feedback. Both groups were subsequently assessed on a survey task for changes in JTC. In line with hypotheses, participants in the positive condition requested significantly more survey comments before drawing conclusions than those in the neutral condition. Results suggest that increases in positive affect may be linked with a tendency to gather more information before making decisions (i.e. a reduction in JTC). The influence of positive affect on reasoning biases in social environments is discussed. (c) 2010 Elsevier Ltd. All rights reserved.