Spinal Excitability Changes after Transspinal and Transcortical Paired Associative Stimulation in Humans

Figure 2

TEPs recruitment curves before and after transcortical-transspinal PAS. Recruitment input-output curves of transspinal-evoked potentials (TEPs) recorded bilaterally from the TA, MG, SOL, and PL muscles from all subjects along with the sigmoid function fitted to the data. The abscissa shows multiples of stimulation intensities corresponding to 50% TEP max (S50). The ordinate shows TEP sizes as a percentage of the homonymous maximal TEP size obtained before transcortical-transspinal PAS. Red or blue arrows indicate statistically significant differences (decreased and increased amplitudes, resp.) before and after PAS based on 2-way repeated measures ANOVA. TA: tibialis anterior; MG: medial gastrocnemius; SOL: soleus; PL: peroneus longus.