Methodik und Auswertung visuell evozierter EEG-Potentiale bei Verdacht auf multiple Sklerose
✍ Scribed by D. Lehmann; Z. Mir
- Publisher
- Springer
- Year
- 1976
- Tongue
- English
- Weight
- 405 KB
- Volume
- 213
- Category
- Article
- ISSN
- 0340-5354
No coin nor oath required. For personal study only.
✦ Synopsis
In multiple sclerosis, average EEG potentials which are monocularly evoked by checkerboard pattern reversal frequently show increased latencies of the dominant, occipitally positive peak (more than 110 ms), and latency differences of more than 6--7 ms between responses to right and left eye stimulation. Fixation of the stimulus field at the lower border causes significantly longer latencies and smaller amplitudes than fixation at the upper border. With lower border fixation, the increase of response latency may suggest a reversal of response polarity in extreme cases. Central fixation often but not always results in responses similar to upper border fixation. In order to have minimal variability of the results, fixation of the stimulus field at the upper border is preferred over central fixation.