Abnormal prediction error processing in schizophrenia and depression.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Adaptive decision-making relies on monitoring prediction errors (discrepancy between expected and actual outcomes).
• Reward-based learning deficits are observed in both depression and schizophrenia.

Purpose of the Study:

• To meta-analyze studies investigating prediction error processing in depression and schizophrenia.
• To identify common and distinct neural correlates of prediction error in these patient groups.

Main Methods:

• Systematic compilation of relevant studies.
• Performance of meta-analyses on neuroimaging data (t-maps) related to prediction errors.
• Comparison of brain activity patterns between depression, schizophrenia, and healthy controls.

Main Results:

• Striatal activity was consistently observed for positive prediction errors in both patient groups.
• Negative prediction errors showed distinct patterns: right frontal lobes in schizophrenia, and medial prefrontal cortex/bilateral insula in depression.
• Posterior cingulate cortex activity was present in both patient groups, more pronounced in depression, and absent in controls.

Conclusions:

• Findings suggest altered prediction error encoding in depression and schizophrenia.
• Involvement of dopamine-rich areas in these alterations is indicated.
• Distinct and overlapping neural substrates for prediction error processing in these disorders were identified.