D. Lehmann, H.P. Metes, Z. Mir Neurologische Universitätsklinik, Kantonsspital Zürich/Schweiz Average EEG potentials evoked by checkerboard (16 deg arc field, checks appr l deg arc) Inversion (2/sec) have become an important tool for neurological diagnosis (1). Time between Checkerboard Inversion and maximal positive voltage of the EEG field ("latency") over posterior scalp areas is measured, usually examining waveforms obtained from one or more electrode combinations. For a given Visual Stimulus, the evoked waveforms depend on (a) the stimulus location on the retina, and (b) the electrode location on the scalp, where there is no "inactive" location. In order to (a) clarify differences in conventionally recorded waveforms of evoked Potentials which were obtained by Stimulation of the upper, lower, left, or right hemiretina (2, 3, 4), and in order to (b) determine optimal electrode positions for routine examinations with few recording channels, scalp EEG field distributions were mapped in 2 msec intervals, using a 48 channel recording System (5). Maps can be examined individually, äs direct voltage readings, or äs interpolated isopotential plots, or can be viewed äs film sequence (shown at meeting). üpper hemiretina Stimulation causes the posterior positivity to peak earlier in time and at a more
Biomedizinische Technik / Biomedical Engineering – de Gruyter
Published: Jan 1, 1976
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