[Visual evoked potentials as affected by different modes of stimulation].
VEP with 3 different modes of stimulation (pattern-reversal, flash and light-emitting diodes = LED) were performed in 30 subjects with normal vision. Normal values were established and the main components were compared under these 3 conditions of stimulation. The latencies of the main components showed a normal distribution in pattern-reversal and flash stimulation mode, but not in LED stimulation modes. The latency of the main component P2 of pattern reversal stimulation mode as well as the amplitude showed the smallest variance; flash and LED stimulation mode had a longer latency of the main component than pattern reversal stimulation mode. No sex or side differences were observed. In one subject (3%) the main component (P2) of pattern-reversal stimulation mode had a W-form, in LED stimulation mode 63% and in flash stimulation mode 40% of the subjects showed a W-form of the main component. The main component (P2) of pattern-reversal stimulation mode was best correlated with the first component of a W-from in flash and LED stimulation mode. Therefore, from one latency value (LED or flash stimulation mode) a latency value of pattern reversal stimulation mode may be estimated.
D000328:Adult; D005074:Evoked Potentials, Visual; D005260:Female; D005556:Form Perception / Q000502:physiology; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000295:instrumentation / Q000379:methods*
Visuell evozierte Potentiale bei verschiedenen Reizarten.