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Title of Journal: Exp Brain Res

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Abbravation: Experimental Brain Research

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Springer-Verlag

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10.1016/0360-1323(91)90071-i

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1432-1106

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Differences in cortical activation during smooth p

Authors: O Baumann B Ziemus R Luerding G Schuierer U Bogdahn M W Greenlee
Publish Date: 2007/03/20
Volume: 181, Issue: 2, Pages: 237-247
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Abstract

Current evidence supports the proposal that the cerebellum mediates the activity of other brain areas involved in the control of eye movements Most of the evidence so far has concentrated on the vermis and flocculi as the cerebellar agents of oculomotor control But there is also evidence for an involvement of the cerebellar hemispheres in eye movement control Straube et al Ann Neurol 42891–898 1997 showed that lateral hemispheric lesions affect initiation of smooth pursuit SPEM and saccadic eye movements Ron and Robinson J Neurophysiol 361004–1022 1973 evoked smooth pursuit and saccadic eye movements by electrical stimulation of crus I and II as well as in the dentate nuclei of the monkey Functional MRI studies also provide evidence that the cerebellar hemispheres play a significant role in SPEM and saccadic eye movements To clarify the role of the cerebral hemispheres in eye movement control we compared the eye movement related blood oxygen level dependent BOLD responses of 12 patients with cerebellar lesions due to stroke with those of an agedmatched healthy control group Six patients showed oculomotor abnormalities such as dysmetric saccades or saccadic SPEM during the experiment The paradigm consisted of alternating blocks of fixation visually guided saccades and visually guided SPEM A nonparametric randomeffects group analysis showed a degraded pattern of activation in the patient group during the performance of SPEM and saccadic eye movements in posterior parietal areas putatively containing the parietal eye fields

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