Affective priming of body and facial expressions in Parkinson's disease

Patients with Parkinson's disease (PD) often experience impairments in emotion processing. Previous literature has highlighted deficits in facial expression recognition and body movement processing, including social signals. However, to date, the integration of facial and bodily expressions has been investigated in healthy populations, but not in individuals with PD. The present study assessed the reciprocal influence between facial and body emotion recognition by using subliminal priming paradigms in a sample of PD patients and in healthy controls (HC). Participants completed both a Face-Body and a Body-Face priming task, in which facial or body expressions subliminally primed the discrimination of body or face emotions, respectively. Recognition of face and body emotions was also assessed. The results revealed that the discrimination of fearful and happy body expressions was not modulated by the previous congruent, incongruent, or neutral face in PD patients, whereas a significant Face-Body priming effect was observed in HC. In contrast, body emotion did not significantly prime face expression discrimination in either group. These findings suggest an impairment in the automatic integration of emotional information from faces and bodies in PD, which may hinder the detection of mismatches between emotional information from different cues.