Mismatched expressions decrease face recognition and corresponding ERP old/new effects in schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Face recognition is crucial for social interaction.
• Schizophrenia is associated with significant social cognition deficits.
• Electrophysiological correlates of face recognition impairments are not fully understood.

Purpose of the Study:

• To investigate the electrophysiological (ERP) correlates of face recognition deficits in schizophrenia.
• To examine how changes in facial expression affect face recognition and associated ERPs in schizophrenia patients.
• To explore the role of familiarity processing in schizophrenia-related face recognition impairments.

Main Methods:

• Utilized a long-term face-recognition task.
• Compared patients with schizophrenia (n=20) to matched healthy participants (n=20).
• Analyzed event-related potentials (ERPs), including midfrontal FN400 and late parietal old/new effects, under conditions of matched and mismatched facial expressions.

Main Results:

• Facial expression changes significantly decreased face discriminability in schizophrenia patients compared to controls.
• Schizophrenia patients exhibited an absence of midfrontal FN400 and late parietal ERP old/new effects during mismatched expression recognition.
• These ERP effects were preserved in both groups when facial expressions remained unchanged.

Conclusions:

• The recognition deficit in schizophrenia, particularly with expression changes, is linked to impaired familiarity assessment mechanisms, as indicated by ERP findings.
• The study highlights the impact of expression change on retrieval processes, offering novel insights into schizophrenia-linked face recognition deficits.
• Phenomenological differences in familiarity emergence provide a new perspective on these cognitive impairments.