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Schizophrenia

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Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those...

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Reward-driven decision-making impairments in schizophrenia.

Sarah Saperia¹, Susana Da Silva², Ishraq Siddiqui²

¹Centre for Addiction and Mental Health, Toronto, Canada.

Schizophrenia Research

|November 17, 2018

Summary

Patients with schizophrenia show impaired decision-making when choosing between multiple options, specifically a reduced tendency to repeat rewarding choices. This contrasts with major depressive disorder patients, who did not exhibit these decision-making deficits.

Keywords:

Decision-making Depression Motivation Reward learning Schizophrenia

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Area of Science:

Neuroscience
Psychiatry
Cognitive Psychology

Background:

Effective decision-making relies on feedback processing for goal-directed behavior.
Previous research linked impaired feedback-driven decision-making to schizophrenia and depression, often using simplified binary choice tasks.
Real-world decisions involve complex choices with varying rewards and losses, necessitating different assessment methods.

Purpose of the Study:

To investigate win-stay/lose-shift (WSLS) behavior on the Iowa Gambling Task (IGT) in patients with schizophrenia and major depressive disorder.
To evaluate how immediate rewards and losses influence real-world decision-making in these patient groups.
To compare WSLS behavior in schizophrenia and major depressive disorder patients against healthy controls.

Main Methods:

Fifty-one schizophrenia patients, 43 major depressive disorder patients, and 51 healthy controls completed the IGT.
Clinical and cognitive assessments were administered to all participants.
WSLS behavior was quantified by analyzing trial-by-trial responses to rewards and losses on the IGT.

Main Results:

Schizophrenia patients exhibited normal lose-shift behavior but significantly lower win-stay rates compared to controls.
No significant WSLS impairments were observed in the major depressive disorder group.
In schizophrenia patients, impaired win-stay behavior correlated with deficits in motivation and cognition.

Conclusions:

Schizophrenia is associated with impaired reward-driven decision-making in complex choice scenarios, characterized by reduced advantageous win-stay behavior.
This deficit in reward learning and decision-making may underlie the motivational impairments observed in schizophrenia.
Major depressive disorder patients did not show similar impairments in feedback-driven decision-making on the IGT.