ACTIVITY IN THE HUMAN PRIMARY MOTOR CORTEX RELATED TO IPSILATERAL HAND MOVEMENTS

In two studies with positron emission tomography (PET), we found that somatosensory discrimination of length activated the ipsilateral MI, b ut somatosensory discrimination of shape did not. This occurred even t hough both tasks required the exclusive use of distal finger and hand movements which were also very similar in both tasks. The activation o f the ipsilateral MI was correlated with activations of the premotor c ortex in the other hemisphere, the prefrontal cortex and the posterior cingulate cortex, indicating that these areas together with the ipsil ateral MI constitute a task-related active network.