Large scale brain activations predict reasoning profiles

► Different solution strategies to deductive problems can be identified behaviorally. ► People search for valid solutions, focus on problem form, or follow nonlogical biases. ► Activation in BA47 and BA19 predicts whether logically valid solutions are produced. ► Activation of BA44/45 and BA6/8 predicts sensitivity to logical structure of problems. ► Brain areas within the reasoning network have differential functional roles.