[Methodologic effects in somatosensory evoked potential diagnosis (stimulus frequency, filter, stimulation and recording site)].

The importance of the parameters stimulation rate, filter, stimulation- and recording place is presented; thus, a reduction in the low-pass filter frequency produces an increase in latency and an increase in the high-filter a decrease in latency of all SEP-components. A proper choice of the filters leads to a selection of the relevant signals; in a topic classification of the SEP generator the referential electrode must in any case be taken into consideration.