Modeling Decision-Making in Schizophrenia: Associations Between Computationally Derived Risk Propensity and...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is linked to diminished pursuit of risky rewards in uncertain decision-making scenarios.
• The underlying mechanisms, including cognitive factors and traits, are not well understood.

Purpose of the Study:

• To investigate the mechanisms behind reduced risky reward pursuit in schizophrenia.
• To examine the roles of cognitive abilities and specific traits in uncertain-risk decision-making.

Main Methods:

• Thirty individuals with schizophrenia/schizoaffective disorder (SZ) and 30 comparison participants (CP) completed the Balloon Analogue Risk Task (BART).
• Computational modeling assessed Risk Propensity, Prior Belief of Success, Learning Rate, and Behavioral Consistency.
• Intelligence quotient (IQ), risk perception, expected benefit of risks, defeatist beliefs, and hedonic tone were analyzed for their relationship with Risk Propensity.

Main Results:

• The SZ group showed lower Risk Propensity and higher Prior Beliefs of Success on the BART, with similar Learning Rates compared to CP.
• Risk Propensity correlated positively with IQ across both groups.
• Interactions revealed that lower perceived risk was associated with lower Risk Propensity in the SZ group and individuals with below-median IQ.

Conclusions:

• Decreased risk-taking in schizophrenia may stem from 'risk imperception,' a failure to accurately perceive and utilize risk information.
• Cognitive factors, particularly the perception of risk, are crucial for advantageous uncertain-risk decision-making.