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Typical example of averaged EEG recording in patient no. 3. After turning the stimulator on (see arrow, due to the “stimulation on” delay period of 110 ms, the time sequence displayed on the x-axis starts at 110 ms) the recording displays the typical potential sequence seen in our patients: the first large electronegative peak (with a latency of 50 ms) may be referred to as an early sensory evoked potential comparable to classical pudendal evoked potentials. This is regularly followed by two positive peaks at 216 and 303 ms and two negative peaks at 253 and 453 ms. A late electronegative potential with a latency of 1.5 s occurs synchronously to the moment of switching the stimulator off.
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