Bi-hemispheric effects on corticospinal excitability induced by repeated sessions of imagery versus observation of actions. Restor Neurol Neurosci. 2012;30(6):481-9. doi: 10.3233/RNN-2012-120241. Bi-hemispheric effects on corticospinal excitability induced by repeated sessions of imagery versus observation of actions. Bianco G, Feurra M, Fadiga L, Rossi A, Rossi S. Source Dipartimento di Neuroscienze, Sezione Neurologia and Neurofisiologia Clinica, Azienda Ospedaliera Universitaria Senese, Siena, Italy.