Slow waves always immediately follow, and are often higher amplitude than, their precedent spikes or sharps. Realistically, the cutoff between them is not very important clinically, as one isn't known to be any more "severe" than the other.Īfter a spike or sharp, there is typically a slow wave, which represents the refractory period of the affected neuron population after the large and synchronized EPSPs that led to the spike or sharp itself. ![]() A spike is very similar to a sharp but faster, with a duration from 20-70ms. A sharp is a single epileptiform discharge defined by its duration lasting between 70-200ms, and by its disruption of the EEG background. ![]() Any epileptiform discharge is a disruption of the usual functioning of the brain, and sharps and spikes are perhaps the most classic type.
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