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Behavioural Neurology - Volume 23 2010, Issue 1-2, Pages 39-49



Department of Psychology, Royal Holloway, University of London, London, UK

Division of Neuroscience and Mental Health, Imperial College London, London, UK

Centre for Functional MRI of the Brain, University of Oxford, Oxford, UK

Ashford and St Peter’s Hospital, UK

Received 12 August 2010; Accepted 12 August 2010

Copyright © 2010 Hindawi Publishing Corporation and the authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Recent research has characterized the anatomical connectivity of the cortico-cerebellar system – a large and important fibre system in the primate brain. Within this system, there are reciprocal projections between the prefrontal cortex and Crus II of the cerebellar cortex, which both play important roles in the acquisition and execution of cognitive skills. Here, we propose that this system also plays a particular role in sustaining skilled cognitive performance in patients with Relapsing-Remitting Multiple Sclerosis RRMS, in whom advancing neuropathology causes increasingly inefficient information processing. We scanned RRMS patients and closely matched healthy subjects while they performed the Paced Auditory Serial Addition Test PASAT, a demanding test of information processing speed, and a control task. This enabled us to localize differences between conditions that change as a function of group group-by-condition interactions. Hemodynamic activity in some patient populations with CNS pathology are not well understood and may be atypical, so we avoided analysis strategies that rely exclusively on models of hemodynamic activity derived from the healthy brain, using instead an approach that combined a ‘model-free’ analysis technique Tensor Independent Component Analysis, TICA that was relatively free of such assumptions, with a post-hoc ‘model-based’ approach General Linear Model, GLM. Our results showed group-by-condition interactions in cerebellar cortical Crus II. We suggest that this area may have in role maintaining performance in working memory tasks by compensating for inefficient data transfer associated with white matter lesions in MS.





Autor: E. Lesage, M. A. J. Apps, A. L. Hayter, C. F. Beckmann, D. Barnes, D. W. Langdon, and N. Ramnani

Fuente: https://www.hindawi.com/



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