Since the beginning of our work on the electrical activity of the cortex,1 we have attempted to distinguish between the different types of abnormal waves that are encountered in epilepsy. We have described the wave and spike of petit mal,2 the crescendo burst of fast waves of grand mal2 and the slow square waves and high voltage 6 per second waves of psychic equivalent seizures.3
Characteristic examples of these various formations have been published,2d but for ease of reference they are shown again in figure 1. It will be noted that there are two kinds of wave and spike activity: (1) the approximately 3 per second wave and spike rhythm of the true petit mal seizure which is commonly accompanied by clonic muscle jerks, synchronous with the 3 per second rhythm, and (2) the slow wave and spike formation which repeats approximately twice a second and
GIBBS FA, GIBBS EL, LENNOX WG. INFLUENCE OF THE BLOOD SUGAR LEVEL ON THE WAVE AND SPIKE FORMATION IN PETIT MAL EPILEPSY. Arch NeurPsych. 1939;41(6):1111–1116. doi:10.1001/archneurpsyc.1939.02270180039002
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