The purpose of this study was to investigate the neurobehavioral correlates of PCC abnormalities in patients with NREM parasomnia.

The Reinforcement Sensitivity Theory of Personality Questionnaire and the Stress Coping Questionnaire was used to assess personality and stress coping in 15 patients with NREM parasomnia and 15 healthy controls that were comparable on the basis of demographics.

In the Reinforcement Sensitivity Theory of Personality Questionnaire, increased trait reactivity of the behavioral inhibition system and goal-driven persistence contributed most to the discrimination of patients and controls. In the Stress Coping Questionnaire, patients showed an increased negative coping trait related to an increase in adjusted left PCC volume.

The results of this study concluded that the subclinical behavioral abnormalities in patients with NREM parasomnias. Such traits might trigger maladaptive emotion regulation processes related to a relative PCC volume increase. The findings encourage further longitudinal studies on this topic, which can provide insights into the causal relations underlying the PCC volume–behavior correlation. Such future studies will have a more direct implication for the clinical management of patients with NREM parasomnias.