![]() ![]() ![]() Movement sequences form an essential part of behavior ( Lashley 1951 Rhodes et al. As part of cortical dynamics, interregional phase synchrony varies depending on task demands in production of cognitive-motor sequences.ĭICS, functional connectivity, language production, MEG, movement sequence Introduction Interpreted within a modular framework, these modulations of synchrony mainly highlighted interactions of the putative pericentral subsystem of hand coordination and the frontoparietal subsystem mediating working memory operations. At the beta-to-gamma band (~13–45 Hz), enhanced synchrony was observed for regular handwriting in the central and frontoparietal regions, including connections between the sensorimotor and supplementary motor cortices and between the parietal and dorsal premotor/precentral cortices. At low frequencies (~2–13 Hz), enhanced frontoparietal synchrony was related to regular handwriting, whereas premotor cortical regions synchronized for simple loop production and temporo-occipital areas for a writing task substituting normal script with loop patterns. Data-driven magnetoencephalography mapping ( n = 10) uncovered modulation of mostly left-hemispheric corticocortical interactions, as quantified by relative changes in phase synchronization. Specifically, variants of handwriting that differed in motor variability, linguistic content, and memorization of movement cues were contrasted to unveil functional sensitivity of corticocortical connections. ![]() Here, we studied synchronous interplay between cortical regions during production of cognitive-motor sequences in humans. ![]() Both motor and cognitive aspects of behavior depend on dynamic, accurately timed neural processes in large-scale brain networks. ![]()
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