Left side: normal short latency somatosensory evoked potentials (SSEPSs) after stimulation of the median nerve (top picture) and posterior tibial nerve.

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Left side: normal short latency somatosensory evoked potentials (SSEPSs) after stimulation of the median nerve (top picture) and posterior tibial nerve (bottom picture). Left side: normal short latency somatosensory evoked potentials (SSEPSs) after stimulation of the median nerve (top picture) and posterior tibial nerve (bottom picture). Right side: top picture shows normal median nerve SSEPSs while the scalp potentials from the posterior tibial nerve (bottom picture) show a dispersed P37 potential with a prolonged latency. P Walsh et al. J Neurol Neurosurg Psychiatry 2005;76:ii16-ii22 ©2005 by BMJ Publishing Group Ltd