Determinants of real-world functional performance in schizophrenia subjects: correlations with cognition, functional capacity, and symptoms.

By C. Bowie, A. Reichenberg, T. Patterson, R. Heaton, Philip D. Harvey. American Journal of Psychiatry, 2006

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The Clinical Assessment Interview for Negative Symptoms (CAINS): Final Development and Validation (2013, methodology): “To assess functional capacity and real-world functioning (19), we administered the brief version of the UCSD PerformanceBased Skills Assessment (UPSA-Brief) (20) and the Role Functioning Scale (21), assessing work, self-care, family, and social functioning.”
The diagnosis of mental disorders: the problem of reification. (2010, background): “These reflect abnormal functioning of the prefrontal cerebral cortex, resulting in impairment of working memory and thus the ability to control thought and behavior in conformity with internally represented goals (Bowie et al. 2006, Cannon et al. 2002, Tan et al. 2006).”
Negative symptoms in schizophrenia: avolition and Occam's razor. (2010, background): “Of note, subsequent investigations by the same group reveal that both symptom domains impact functional outcomes, with neuropsychological performance affecting an individual’s functional capacity, while negative symptoms appear more related to the likelihood of implementation of these abilities.(41,”