Interoception and Positive Symptoms in Schizophrenia.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Self-disturbance is a core feature of schizophrenia.
• Interoceptive accuracy, the sense of the internal bodily state, is crucial for an intact sense of self.
• Previous research indicates altered self-perception in schizophrenia, but interoceptive accuracy remains unexplored.

Purpose of the Study:

• To investigate interoceptive accuracy in schizophrenia patients compared to healthy controls.
• To explore the relationship between interoceptive accuracy and positive and negative symptoms in schizophrenia.
• To determine if factors like age, BMI, anxiety, heart rate, illness severity, attention, or medication influence interoceptive accuracy.

Main Methods:

• A heartbeat perception task was administered to 23 schizophrenia patients and 23 healthy controls.
• The Positive and Negative Syndrome Scale (PANSS) was used to assess symptom severity.
• Statistical analyses controlled for potential confounding variables.

Main Results:

• Schizophrenia patients exhibited significantly lower interoceptive accuracy than healthy controls.
• This difference was independent of age, BMI, anxiety, heart rate, illness severity, attention, and medication.
• A significant positive correlation was found between interoceptive accuracy and the severity of positive symptoms, particularly Grandiosity.

Conclusions:

• Interoceptive accuracy is demonstrably altered in individuals with schizophrenia.
• Altered interoceptive accuracy is specifically associated with positive symptomatology in schizophrenia.
• The findings suggest that Grandiosity may confer a protective effect against profound self-disturbance by enhancing sensitivity to internal bodily sensations.