Weight-Space Mapping of fMRI Motor Tasks
In this report, we examine the notion that networks of neocortical activity exist simultaneously across different spatial scales. Our investigations concern human motor data obtained from six motor tasks using functional magnetic resonance imaging (fMRI) at 1.5 T (Sutton et al., 1996). Weights for all pairs of fMRI voxels were calculated across tasks without anatomical bias, and weight maps were produced. We observed regions of interest, which averaged 1 cm3 in size, and a theoretically predicted network two orders of magnitude larger that linked anatomically related regions together. Temporal analysis revealed the persistence of multilevel clus tering through time. Our results support the concept that some dynamic networks in the neocortex are nested within other networks.
KeywordsMotor Task Nest Network Neocortical Activity Motor Cortex Plasticity Repetitive Finger Move
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