Neurocognitive function in long-term treated schizophrenia: a five-year follow-up study.

Area of Science:

• Psychiatry
• Neuroscience
• Cognitive Psychology

Background:

• Neurocognitive deficits are a hallmark of schizophrenia, impacting various cognitive functions.
• Longitudinal studies on the progression of neurocognitive impairment in schizophrenia are limited.
• Understanding cognitive changes over time is crucial for managing schizophrenia.

Purpose of the Study:

• To investigate the longitudinal changes in neurocognitive functions in patients with schizophrenia compared to healthy controls.
• To examine the effect of time on a range of cognitive abilities over a 4.5-year period.
• To identify factors influencing cognitive outcomes in schizophrenia.

Main Methods:

• A neurocognitive test battery was administered to 36 patients with schizophrenia and 46 healthy controls on two occasions, approximately 4.5 years apart.
• Cognitive functions assessed included attention, processing speed, executive functions, and verbal learning.
• Statistical analyses were performed to compare changes over time between groups and identify related factors.

Main Results:

• Patients with schizophrenia consistently performed worse than controls across all cognitive measures at both time points.
• The ability to shift mental set (Trail Making Test B) significantly declined over time in both patients and controls.
• Patients showed improvement in attention (Continuous Performance Test), while controls improved in verbal learning (Rey Auditory Verbal Learning Test).
• Higher education levels correlated with better outcomes in patients, while age influenced outcomes in controls.

Conclusions:

• Neurocognitive function in long-term treated schizophrenia patients demonstrates relative stability over a 4.5-year period.
• While overall cognitive function is stable, specific abilities like mental set shifting may decline with time in both patient and control groups.
• Factors such as education and age play a role in cognitive outcomes, highlighting the need for personalized approaches in schizophrenia management.