Epileptic Disorders
MENUBilateral synchronous gamma range firing of bulbar motor units during tonic seizures Volume 21, numéro 4, August 2019
TEST YOURSELF
(1) What determines the shape of the power spectrum of surface EMG?
(2) In the literature, the power spectrum of surface EMG during tonic seizures changes. Does the frequency increase or decrease?
(3) What is the Piper rhythm?
Answers
(1) The shape of surface EMG power spectrum is based on power spectrum density of the underlying motor unit action potentials multiplied by the power spectra of the firing processes.
(2) Increase.
(3) The Piper rhythm is a prominent peak frequency at around 40 Hz of the surface EMG during maximal isometric contractions in controls (Brown et al., 1998).