1 Institute of Neuroscience, The Medical School, Newcastle University, NE2 4HH, UK; Department of Neurology, Royal Victoria Infirmary, Newcastle upon Tyne, NE1 4LP, UK; Department of Clinical Neurophysiology, Royal Victoria Infirmary, Newcastle upon Tyne, NE1 4LP, UK. Electronic address: m.r.baker@ncl.ac.uk.
2 Brain and Mind Centre, The University of Sydney, Sydney, Australia.
3 Institute of Neuroscience, The Medical School, Newcastle University, NE2 4HH, UK; Department of Clinical Neurophysiology, Royal Victoria Infirmary, Newcastle upon Tyne, NE1 4LP, UK.
4 Brain and Mind Centre, The University of Sydney, Sydney, Australia; Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Sydney, Australia.