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Abstract:
Abstract: This study investigated cerebellar influences on
cognitive processes associated with visual spatial attention.
Event-Related Potentials (ERPs) were recorded from eight cerebellar
lesion subjects and 28 normal control subjects during a visual
spatial attention task. Data from cortical lesion subjects,
recorded as additional control groups, are presented in a companion
poster by Edwards, et al. Data was analyzed using both traditional
peak-based methods and Independent Component Analysis (ICA).
Cerebellar damage resulted in a reduced Late Positive Complex
(LPC). While this complex was affected at all scalp locations,
there was a differential effect of cerebellar damage on anterior
and posterior distributions. ICA reduced the LPC to three
subcomponents, indicating separable contributions from different
brain networks. Cerebellar damage affected two out of these three
subcomponents. These results are consistent with recent behavioral
data that point to cerebellar participation in non-motor,
attention-related processes.
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