In this fMRI study, we investigated Theory of Mind (ToM) in patients with paranoid schizophrenia. We hypothesized that the network supporting the representation of intentions is dysfunctional in patients with schizophrenia dependent on the type of intention involved. We used a paradigm including a control condition (physical causation) and three intention conditions (private intention, prospective social intention and communicative intentions) differing in the degree of social interaction. Patients showed significantly less activation in three regions typically activated in ToM tasks, i.e. paracingulate cortex and bilateral temporoparietal junctions. However, this dysfunction was dependent on the type of intention represented, i.e. was present only for social but not for non-social intentions. Moreover, part of the reduced activation was related to the fact that there was no signal drop in these regions for the physical causality condition as usually found in controls. This may be due to the tendency of schizophrenic patients to attribute intentionality to physical objects
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