Balslev D;Nielsen FA;Frutiger SA;Sidtis JJ;Christiansen TB;Svarer C;Strother SC;Rottenberg DA;Hansen LK;Paulson OB;Law I
Cluster analysis of activity-time series in motor learning
Hum Brain Mapp 2002, 15(3), , 135-145

Neuroimaging studies of learning focus on brain areas where the activity changes as a function of time. To circumvent the difficult problem of model selection, we used a data-driven analytic tool, cluster analysis, which extracts representative temporal and spatial patterns from the voxel-time series. The optimal number of clusters was chosen using a cross-validated likelihood method, which highlights the clustering pattern that generalizes best over the subjects. Data were acquired with PET at different time points during practice of a visuomotor task. The results from cluster analysis show practice-related activity in a fronto-parieto-cerebellar network, in agreement with previous studies of motor learning. These voxels were separated from a group of voxels showing an unspecific time-effect and another group of voxels, whose activation was an artifact from smoothing