%0 Journal Article
%T Altered Functional Connectivity of Cognitive-Related Cerebellar Subregions in Well-Recovered Stroke Patients
%A Wei Li
%A Tong Han
%A Wen Qin
%A Jing Zhang
%A Huaigui Liu
%A Ying Li
%A Liangliang Meng
%A Xunming Ji
%A Chunshui Yu
%J Neural Plasticity
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/452439
%X The cerebellum contains several cognitive-related subregions that are involved in different functional networks. The cerebellar crus II is correlated with the frontoparietal network (FPN), whereas the cerebellar IX is associated with the default-mode network (DMN). These two networks are anticorrelated and cooperatively implicated in cognitive control, which may facilitate the motor recovery in stroke patients. In the present study, we aimed to investigate the resting-state functional connectivity (rsFC) changes in 25 subcortical ischemic stroke patients with well-recovered global motor function. Consistent with previous studies, the crus II was correlated with the FPN, including the dorsolateral prefrontal cortex (DLPFC) and posterior parietal cortex, and the cerebellar IX was correlated with the DMN, including the posterior cingulate cortex/precuneus (PCC/Pcu), medial prefrontal cortex (MPFC), DLPFC, lateral parietal cortices, and anterior temporal cortices. No significantly increased rsFCs of these cerebellar subregions were found in stroke patients, suggesting that the rsFCs of the cognitive-related cerebellar subregions are not the critical factors contributing to the recovery of motor function in stroke patients. The finding of the disconnection in the cerebellar-related cognitive control networks may possibly explain the deficits in cognitive control function even in stroke patients with well-recovered global motor function. 1. Introduction Ischemic stroke is one of the leading causes of motor disability in adults, while most patients experience a certain degree of recovery of motor function. The mechanisms of motor recovery after stroke have been extensively investigated especially using the neuroimaging techniques [1¨C6]. However, the contribution of cerebellum to motor recovery after stroke is a subject of much debate. The contralesional cerebellum is a part of the affected motor network and has reciprocal connections with the ipsilesional sensorimotor cortex. In subcortical stroke, contralesional cerebellar hypometabolism [7¨C9] and atrophy [10] are reported and have been ascribed to the damage of anatomical connections by lesions [11, 12]. Initially the affected cerebellum has been shown to exhibit greater activation during performing a motor [13] or a tactile exploration task [14] with the affected hand. Subsequently, this activation decreased gradually and this was correlated with functional recovery [15]. In a longitudinal analysis of the executive motor network, the betweenness centrality (a measure evaluating the importance of a node in
%U http://www.hindawi.com/journals/np/2013/452439/