Motivated Mislearning : The Case of Correlation Neglect

We design an experiment to study the role of motivated reasoning in correlation neglect. Participants receive potentially redundant signals about an ego-relevant state—their IQ test performance. We elicit their belief that the signals came from the same source (and thus contain redundant information). Participants generally underappreciate the extent to which identical signals are more likely to come from the same source, but the bias is significantly stronger for good (ego-favorable) signals than for bad (ego-unfavorable) signals. This asymmetric effect disappears in a control treatment where the state is ego-irrelevant. These results suggest that individuals may neglect the correlation between desirable signals to sustain motivated beliefs. However, the estimated effect is not quantitatively large enough to generate significant asymmetric updating about own IQ test performance