Transitive inference reasoning is impaired by focal lesions in parietal cortex rather than rostrolateral prefrontal cortex

► Transitive inference reasoning involves the examination of relational pairs (e.g. A>B; B>C; C>D). ► The parietal cortex (PLC) is important for resolving transitive inferences. ► Other studies implicate frontal cortex (BA 10) for resolving transitive inferences. ► This patient study implicates the PLC rather than BA 10 for this task. ► This result is not fully explained by working memory deficits in PLC patients.