Educational level and age influence spatial working memory and Wisconsin Card Sorting Test performance differently: a...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Executive function and working memory are crucial cognitive domains.
• Schizophrenia is associated with significant cognitive deficits.
• The influence of sociodemographic factors like education and age on these deficits requires clarification.

Purpose of the Study:

• To investigate the impact of educational level and age on executive function (Wisconsin Card Sorting Test) and working memory in schizophrenia patients.
• To determine if educational level covaries with performance differences between schizophrenic patients and healthy controls.

Main Methods:

• Compared 25 schizophrenic patients and 35 age-matched healthy controls.
• Assessed executive function using the Wisconsin Card Sorting Test (WCST).
• Evaluated working memory via a visual-manual delayed-response task.

Main Results:

• Schizophrenic patients showed poorer performance on both executive function and working memory tasks.
• Educational level correlated with cognitive performance differently for working memory compared to WCST.
• After controlling for education, group differences in executive function disappeared, but working memory differences remained significant.

Conclusions:

• Educational level significantly influences executive function performance in schizophrenia, potentially masking group differences.
• Working memory deficits in schizophrenia appear more robust and less influenced by educational attainment.
• These findings support the dissociation between executive functions and working memory as distinct neurocognitive constructs in schizophrenia.