Deficits in Emotional Face Processing Indexed by N170 Modulation in Chronic and in First Hospitalized Schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Facial emotion recognition is crucial for social interaction and is impaired in schizophrenia, contributing to social deficits.
• The N170 event-related potential component is sensitive to emotional facial expressions in healthy individuals.
• Previous research suggests N170 modulation by emotion may be impaired in chronic schizophrenia.

Purpose of the Study:

• To investigate N170 amplitude modulation by emotional facial expressions in first hospitalized schizophrenia (FHSz) and chronic schizophrenia (ChSz) patients compared to controls.
• To explore the relationship between N170 modulation and symptom severity in schizophrenia.

Main Methods:

• Electroencephalography (EEG) was used to record N170 amplitudes from P9/P10 electrodes in FHSz, ChSz, young controls (YC), and older controls (OC).
• Participants performed a facial emotion detection task involving neutral and emotional faces (happy, angry, disgusted, fearful, sad).
• Symptom severity was assessed using the Positive and Negative Syndrome Scale (PANSS).

Main Results:

• N170 amplitude modulation by facial emotion was observed in FHSz and YC, but not in ChSz compared to OC.
• FHSz participants lacked the typical right-hemisphere lateralization of the N170 response seen in YC.
• In ChSz, reduced N170 modulation was inversely correlated with PANSS negative symptom scores.

Conclusions:

• Schizophrenia is associated with progressive impairment in processing emotional facial expressions, as indicated by reduced N170 modulation.
• While first-hospitalized patients retain some emotional processing capacity, chronic patients show deficits linked to negative symptoms.
• These findings suggest progressive neuropathology affecting N170 generators contributes to persistent social deficits in schizophrenia.