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PubMed1976

Latencies of evoked potentials to flicker and to pattern speedily estimated by simultaneous method.

This note describes a method for rapidly measuring the latency of a steady-state visual evoked potential (EP). Three sinewaves of different frequencies (F1, F2 and F3 c/sec) are summed, and the resulting waveform modulates either light intensity (for flicker stimulation) or spatial contrast (for pattern stimulation). Three evoked potentials of frequencies F1, F2 and F3 c/sec respectively are stimultaneously recorded by running three Fourier analysers in parallel. The outputs of the three analysers are presented in a single polar plot so as directly to display the three values of EP amplitude and phase. Practical methods for generating the pattern and flicker stimuli are described.

Computers, Analog↗
PubMed1981

Evaluation of a simple spike-wave recognition system.

A simple analogue system for recognition of spike-wave discharges is described. During an evaluation study of 81 h recording from 23 patients the mean error rates were 4.7% false negatives and 5.2% false positives.

Computers, Analog↗