To furnish behavioral and electrophysiological evidence of the possible modulation of fatigue in Multiple Sclerosis - relapsing remitting form, through a verbal placebo.

Inclusion Criteria:

i) right-hand dominant; ii) diagnosis of MS, Relapsing-Remitting (RR-) form (Polman et al., 2011); iii) score at the EDSS (Kurtzke, 1983) from 2 to 5.5.

Exclusion Criteria:

i) relapse occurring over the previous six months; ii) a history of illness not less than one year; iii) first dose of disease-modifying or symptomatic treatments and any medication change in the previous three months; iv) reporting a score of equal to 2 or more at FSS (Kurtzke, 1983) cerebellar and brainstem scales; v) neuroimaging evidence of MS lesions at the spinal cord; vi) any known psychiatric or other neurological disorders, history of head injury, or stroke; vii)a score < 24 (Lezak et al., 2004) at the Italian version (Magni et al., 1995) at the MMSE (Folstein et al., 1975).

There is not a plan to make IPD available.