Journal
JOURNAL OF AFFECTIVE DISORDERS
Volume 174, Issue -, Pages 342-352Publisher
ELSEVIER
DOI: 10.1016/j.jad.2014.12.030
Keywords
Bipolar disorder; Working memory; Information processing; Executive functions; Psychomotor coordination; White matter integrity
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Funding
- Italian Ministry of University and Scientific Research
- Italian Ministry of Health
- European Union (7th framework program) (FP7) [222963]
- Trenta ore per la Vita Association
- Janssen-Cilag
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Background: Neuropsychological deficits constitute enduring trait-like features in bipolar disorder (BD), and persist in euthymia. White matter (WM) abnormalities are one of the most consistently reported findings in neuroimaging studies of BD. We hypothesized that neuropsychological performances could correlate with WM integrity in a sample of bipolar patients in core WM tracts. Methods: Seventy-eight patients affected by BD were evaluated for verbal memory, working memory, psychomotor coordination, executive functions, attention and information processing, and verbal fluency through the Brief Assessment of Cognition in Schizophrenia. White matter integrity was evaluated using DTI and tract based spatial statistics with threshold free cluster enhancement (p > 0.949). Results: We observed that cognitive performances in attention and information processing, working memory, executive functions and psychomotor coordination were associated with DTI measures of WM integrity in several association fibres: inferior and superior longitudinal fasciculus, inferior fronto-occipital fasciculus,cingulum bundle, corpus callosurn, and corona radiata. Limitation: The drug treatments administered during the course of the illness could have influenced DTI measures and neurocognitive function. Other limitations include issues such as generalizability due to the lack of a control group, possible undetected past comorbfilitics, population stratification, and the presence of a 28% of patients which previously experienced delusions. Conclusions: This is the first study to use a validated cognitive battery to investigate the principal cognitive domains in BD. Our data confirm the importance of WM integrity as a neurobiological underpinning of cognitive deficits. (C) 2014 Elsevier B.V. All rights reserved.
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