1. Eye tracking and Visual Application Lab (EVA Lab), Department of Medicine, Surgery and Neurosciences, University of Siena , 53100 Siena , Italy
2. Neurology and Neurometabolic Unit, Department of Medicine, Surgery and Neurosciences, University of Siena , 53100 Siena , Italy
3. Centre for Motor Neuron Diseases, Neurology and Neurophysiology Unit, Department of Medicine, Surgery and Neurosciences, University of Siena , 53100 Siena , Italy
4. Neurology and Neurophysiology Unit, Department of Medicine, Surgery and Neuroscience, University of Siena , 53100 Siena , Italy
5. Unit of Neuroimaging and Neurointervention, Department of Neurological and Neurosensorial Sciences, AOUS , 53100, Siena , Italy