The posterior parietal cortex: A cortical „driver“ for bimanual motor learning?

Purpose: In a previous study, a temporary upregulation of interhemispheric functional coupling (measured as EEG coherence) has been identified as a correlate of bimanual motor learning (Andres et al. Brain 1999; 122, 855–70). Here, we tested the hypothesis that the posterior parietal cortex (PPC) serves as a cortical „driver“ that modulates interhemispheric functional coupling during acquisition of new bimanual motor skills. Methods: Healthy subjects (n=18) learned two unimanual finger movement sequences (8 keypresses, paced at 1Hz) and then combined them into one bimanual sequence (16 interleaved key presses, p…