Visual system integrity and cognition in early Huntington's disease

Robert C Wolf, Fabio Sambataro, Nenad Vasic, Eva-Maria Baldas, Iris Ratheiser, G Bernhard Landwehrmeyer, Malte S Depping, Philipp A Thomann, Reiner Heinrich Sprengelmeyer, Sigurd S Süssmuth, Michael Orth

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Posterior cortical volume changes and abnormal visuomotor performance are present in patients with Huntington's disease (HD). However, it is unclear whether posterior cortical volume loss contributes to abnormal neural activity, and whether activity changes predict cognitive dysfunction. Using magnetic resonance imaging (MRI), we investigated brain structure and visual network activity at rest in patients with early HD (n = 20) and healthy controls (n = 20). The symbol digit modalities test (SDMT) and subtests of the Visual Object and Space Perception Battery were completed offline. For functional MRI data, a group independent component analysis was used. Voxel-based morphometry was employed to assess regional brain atrophy, and ‘biological parametric mapping’ analyses were included to investigate the impact of atrophy on neural activity. Patients showed significantly worse visuomotor and visual object performance than controls. Structural analyses confirmed occipitotemporal atrophy. In patients and controls, two spatiotemporally distinct visual systems were identified. Patients showed decreased activity in the left fusiform cortex, and increased left cerebellar activity. These findings remained stable after correction for brain atrophy. Lower fusiform cortex activity was associated with lower SDMT performance and with higher disease burden scores. These associations were absent when cerebellar function was related to task performance and disease burden. The results of this study suggest that regionally specific functional abnormalities of the visual system can account for the worse visuomotor cognition in HD patients. However, occipital volume changes cannot sufficiently explain abnormal neural function in these patients.
Original languageEnglish
Pages (from-to)2417–2426
Number of pages10
JournalEuropean Journal of Neuroscience
Volume40
Issue number2
Early online date3 Apr 2014
DOIs
Publication statusPublished - Jul 2014

Keywords

  • Independent Component Analysis
  • Magnetic Resonance Imaging
  • Occipital Cortex
  • Resting State

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