Premorbid adjustment predictors of cognitive dysfunction in schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Premorbid adjustment (PA) in academic and social domains is a significant predictor of cognitive performance in schizophrenia.
• Previous research has yielded inconsistent findings on the specific relationships between PA domains and post-illness cognition.

Purpose of the Study:

• To explore the multivariate associations of academic and social PA across developmental stages (childhood, early and late adolescence) with post-onset cognitive variables.
• To investigate the differential relationships between PA domain deterioration courses and post-onset cognitive dysfunction.

Main Methods:

• Seventy-five schizophrenia patients were assessed using the Premorbid Adjustment Scale (PAS).
• Cognitive functions including general cognitive ability, verbal IQ, verbal memory and learning, processing speed, working memory, executive function, and premorbid IQ were evaluated.
• Canonical Correlation Analyses were employed to examine the relationships.

Main Results:

• Poorer academic PA during childhood and early adolescence correlated with worse post-onset verbal IQ, working memory, verbal learning, and executive function.
• Deterioration in academic PA between early and late adolescence was linked to poorer verbal learning and executive function, and predicted IQ decline.
• Academic PA exclusively demonstrated associations with post-onset cognitive impairment.

Conclusions:

• Specific developmental periods of academic PA construction are crucial for understanding post-illness cognition.
• Early academic maladjustment may represent the beginning of a cognitive dysmaturational process leading to impaired cognition post-diagnosis.