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Electrical stimulation (ES) of the left NOT using a 10 s train of low current (50 μA) short-duration (200 μs) biphasic pulses at 200 Hz. Nystagmus was elicited at short latency following stimulation at the site indicated in Fig. 1. Immediately following the start of the ES (thick bar, top traces), leftward optokinetic nystagmus (OKN)-like nystagmus begins with slow-phase eye velocity building up during stimulation. First · · · , the onset of the ES.
