Description of patients with Parkinson’s disease.

Age – age on the day of surgery; STN – subthalamic nucleus; GPi – globus pallidus interna; DD – Parkinsońs disease duration; Levodopa – dose/day in mg including levodopa equivalent dosage of dopamine agonist; patient 4 was also treated with mianserin; patients 6, 7, 8, 9, 10 with citalopram and 16 with bupropion; UPDRS III – motor score of the Unified Parkinsońs Disease Rating Scale in OFF medication condition; H-Y – Hoehn and Yahr stage in OFF medication condition; DBS target – nucleus chosen for bilateral deep brain stimulation; SEM – scanning eye movement task; VGS – visually guided saccade task; neurons – number of neurons identified in the basal ganglia.