Dual - processes in conditional inference behaviour 1

134 words) We examined a large set of conditional inference data compiled from several previous studies and asked three questions: how is normative performance related to intelligence, does negative conclusion bias stem from Type 1 or Type 2 processing, and does implicit negation bias stem from Type 1 or Type 2 processing? Our analysis demonstrated that a) rejecting denial of the antecedent and affirmation of the consequent inferences was positively correlated with intelligence, while endorsing MT inferences was not, b) the occurrence of negative conclusion bias was related to the extent of Type 2 processing, and c) that the occurrence of implicit negation bias was not related to extent of Type 2 processing. We conclude that negative conclusion bias is, at least in part, a product of Type 2 processing while implicit negation bias is not.