1. Department of Psychology, Human Cognitive Neuroscience, University of Edinburgh, Edinburgh, UK,
2. Euan MacDonald Centre for Motor Neurone Disease Research, Royal Infirmary of Edinburgh, Edinburgh, UK,
3. Anne Rowling Regenerative Neurology Clinic, Royal Infirmary of Edinburgh, Edinburgh, UK,
4. Academic Unit of Neurology, Trinity College Dublin, Dublin, Ireland,
5. Department of Psychology, Beaumont Hospital, Dublin, Ireland,
6. Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King’s College London, London, UK, and
7. Department of Neurology, Beaumont Hospital, Dublin, Ireland