Spared performance but increased uncertainty in schizophrenia: Evidence from a probabilistic decision-making task

Area of Science:

• Neuroscience
• Psychiatry
• Computational Psychiatry

Background:

• Aberrant salience attribution is linked to positive symptoms in schizophrenia and belief uncertainty.
• Neuromodulators like norepinephrine are implicated in encoding uncertainty.
• Norepinephrinergic encoding of uncertainty, via pupil dilation, is understudied in schizophrenia.

Purpose of the Study:

• To investigate the role of norepinephrine in uncertainty processing in schizophrenia spectrum disorders.
• To compare behavioral and pupillometric responses to uncertainty between patients and controls.

Main Methods:

• Probabilistic prediction task with varying uncertainty levels.
• Behavioral measures and pupillometry (task-related pupil dilation) were recorded.
• Comparison between individuals with schizophrenia spectrum disorder and healthy controls.

Main Results:

• Patients exhibited higher belief uncertainty, especially in unstable environments, suggesting heightened sensitivity.
• Pupil dilation positively correlated with uncertainty in controls, but this relationship was attenuated in patients.
• Findings suggest aberrant neuromodulatory regulation of neural gain in schizophrenia.

Conclusions:

• Schizophrenia is associated with abnormal uncertainty processing and altered norepinephrinergic signaling.
• These findings may inform the development of novel psychopharmacological and psychotherapeutic interventions for schizophrenia.