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Executive Dysfunction in Mild Cognitive Impairment is Associated with Changes in Frontal and Cingulate White Matter Tracts

Article type: Research Article

Authors: Grambaite, Ramunea; b; * | Selnes, Pera; b | Reinvang, Ivarc | Aarsland, Dagb; d | Hessen, Erika | Gjerstad, Leife | Fladby, Tormoda; b

Affiliations: [a] Department of Neurology, Akershus University Hospital, Lørenskog, Norway | [b] Faculty Division Akershus University Hospital, University of Oslo, Oslo, Norway | [c] Center for the Study of Human Cognition, Department of Psychology, University of Oslo, Oslo, Norway | [d] Centre for Age-Related Medicine, Psychiatry Clinic, Stavanger University Hospital, Stavanger, Norway | [e] Department of Neurology, Oslo University Hospital Rikshospitalet, Oslo, Norway

Correspondence: [*] Correspondence to: Ramune Grambaite, Department of Neurology, Akershus University Hospital, Sykehusveien 25, NO-1478 Lørenskog, Norway. Tel.: +47 67968462; Fax: +47 67909130; E-mail: [email protected].

Keywords: Alzheimer's disease, cortical thickness, diffusion tensor imaging, mild cognitive impairment, radial and mean diffusivity, white matter

DOI: 10.3233/JAD-2011-110290

Journal: Journal of Alzheimer's Disease, vol. 27, no. 2, pp. 453-462, 2011

Accepted 2 July 2011
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Published: 18 November 2011
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Supplementary Materials:

Supplementary Materials.

Abstract

Mild cognitive impairment (MCI) may affect multiple neuropsychological domains. While amnestic MCI is associated with Alzheimer's disease, patterns of brain pathology in non-amnestic subtypes have been less studied. Twenty-three patients with attention/executive MCI (a/e MCI), seen at a university-based memory clinic, and 23 normal controls, matched according to age, gender, and education, were included in this study. All subjects were assessed with a neuropsychological test battery, including tests of memory, attention and executive function, and underwent magnetic resonance imaging. Diffusion tensor imaging derived white matter (WM) tract radial and mean diffusivity (DR and MD) were assessed using Tract-Based Spatial Statistics, and cortical thickness (CTH) was assessed using FreeSurfer. This study investigated changes of WM DR/MD and CTH in subjects with a/e MCI, and associations between these changes and different a/e subfunctions. WM DR/MD underlying rostral middle frontal, medial orbitofrontal, caudal anterior cingulate, posterior cingulate, retrosplenial and entorhinal cortices was higher for the a/e MCI than the control group, but CTH was not different from controls in any of the regions. WM DR/MD underlying superior frontal, rostral middle frontal, lateral/medial orbitofrontal and retrosplenial cortices were significantly associated with inhibition/switching performance, while caudal middle frontal CTH was significantly associated with attention and divided attention in the patient group. We conclude that increased WM DR/MD in frontal and cingulate regions and cortical thinning in caudal middle frontal region are both associated with executive dysfunction in MCI.

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