Figure 1 Brainstem Auditory Evoked Potentials, Flash Visual Evoked Potentials, and Somatosensory Evoked Potentials of the Upper and Lower Limbs Brainstem auditory evoked potentials, flash visual evoked potentials, and somatosensory evoked potentials of the upper and lower limbs are shown in A, B, C.a, and C.b, respectively. All these data are elicited by the stimulation of the right ear, eye, median nerve, and tibial nerve. In each of them, the latency of the brainstem and cortical responses are increased, especially for the flash visual evoked potentials, whose P2 component peaked at 192 ms.