Differential EEG Synchronization at Thalamic, Subthalamic and Cortical Levels during a Choice-Reaction Time Task

Basal ganglia nuclei are involved in diverse operations, motor and non-motor. Here, we identified EEG changes during a choice-reaction time task (CRT) at different brain levels, expressed as event-related synchronizations (ERS) and desynchronizations (ERD). Access to the thalamic ventral intermediate nucleus (VIM) and subthalamic nucleus (STN) was achieved during the externalization of electrode leads for deep brain stimulation (DBS). Recordings were performed in 7 patients with essential tremor and bilateral VIM implants (n=14), and in 3 patients with STN implants (n=6) for Parkinson's disease. EEG was recorded…