Pallidotomy in Parkinson's disease increases supplementary motor area and prefrontal activation during performance of volitional movements

1MRC Cyclotron Unit, Hammersmith Hospital, Correspondence to: Dr M. Samuel, MRC Cyclotron Unit, 2The Wellcome Department of Cognitive Neurology, Hammersmith Hospital, Du Cane Road, London 3Institute of Neurology, London, UK, 4Neurologische Klinik W12 0NN, UK der Technischen Universitat, Munchen, Germany, 5Centro de Neurologia y Neurocirguia Functional, Clinica Quiron, San Sebastian, Spain, 6Department of Neurology, Emory University, Atlanta, USA