Figure 1.
Raw data from a representative subject demonstrating the SEP components used for analysis of conduction and processing of the afferent volley at the primary sensory cortex, brainstem and the peripheral volley recorded at Erb’s point.
The dotted line represents the time of stimulation.
Figure 2.
Group data (mean ± standard error) of amplitudes motor evoked potentials (MEP) before (black bars) and after (grey bars) “Motor Movement” and “Sensory 100 Hz” peripheral electrical stimulation (PES) to right abductor pollicis brevis muscle (APB).
MEP amplitude increased following Motor Movement PES and reduced following Sensory 100 Hz PES. * p<0.05.
Figure 3.
Group data (mean ± standard error) before (black bars) and after (grey bars) Motor Movement and Sensory 100 Hz peripheral electrical stimulation (PES) to the right abductor pollicis brevis muscle (APB) for the SEP components (a) P14-N20, (b) N20-P25 and (c) P25-N33.
Motor Movement PES increased the amplitude of the N20-P25 component. Sensory 100 Hz PES increased the amplitude of the sub-cortical P14-N20, and reduced the size of the P25-N33 component. * p<0.05.
Figure 4.
Linear regression between cortical SEP components (N20-P25 and P25-N33) and corticomotor excitability (MEP amplitude).
Note the significant positive correlation (r = 0.71, p<0.001) between these parameters.