In a population of patients with hemispherectomy, Benecke et all found comparable results. The magnetic stimulation of the unaffected hemisphere provided both ipsilateral and controlateral potentials.
The amplitudes of ipsilateral compound muscle action potentials roughly correlated with their individual residual motor capacities and showed a proximal-distal gradient.
In patients with early brain damage the ipsilateral potential had short latencies and large amplitudes, whereas patients with later acquired brain damage presented long latencies and small amplitude.