Mirror neuron function, psychosis, and empathy in schizophrenia.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Schizophrenia is associated with impaired social and emotional information processing.
• Mirror neuron system dysfunction is hypothesized to underlie these deficits.
• Previous research has not directly linked mirror neuron activity in schizophrenia to socio-emotional functioning.

Purpose of the Study:

• To investigate the relationship between mirror neuron system activity and socio-emotional functioning in schizophrenia-spectrum disorder (SSD).
• To assess mirror neuron activity using electroencephalography (EEG) Mu rhythm suppression during observed and actual hand movements.
• To correlate these measures with symptom severity and empathy levels.

Main Methods:

• 16 SSD participants (8 actively psychotic, 8 residual phase) and 16 healthy controls were studied.
• EEG Mu rhythm suppression over the sensorimotor cortex was measured during observed and actual hand movements.
• Empathy was assessed using the Interpersonal Reactivity Index (IRI).

Main Results:

• Actively psychotic SSD participants exhibited significantly greater left-hemisphere Mu rhythm suppression than residual phase SSD and healthy controls.
• Mu rhythm suppression positively correlated with the severity of psychotic symptoms.
• SSD participants reported higher levels of Personal Distress compared to healthy controls.

Conclusions:

• Abnormal mirror neuron activity, indicated by increased Mu rhythm suppression, may be present in schizophrenia during the active psychotic phase.
• This heightened activity correlates with psychosis severity.
• Findings suggest a potential neurobiological basis for socio-emotional deficits in schizophrenia.