Fig. 2
From: Motor evoked potentials for multiple sclerosis, a multiyear follow-up dataset
An example of a single MEP measurement. The measurement starts when the stimulation occurs in the brain and has a total duration of 100 milliseconds. The spike at the start of the measurement is a direct consequence of the stimulation. The latency is the time it takes for the signal to reach the muscle under consideration. The latency is typically higher when the motor tracts become damaged. The peak-to-peak amplitude measures the strength of the signal, which may be lower in case of damage to the motor tracts, which is typical for MS.
