## 3 Results
### ICrA Data Processing Results  
For the completeness of the current investigation and a deeper understanding of human nervous-muscle excitability, three case studies processed by the ICrA approach will be considered further. The three case studies differ in the objects and criteria. All ICrA calculations were performed using averaged raw data from all three repeats for each stimulus intensity at each muscle condition task. **Case study 1. ** Assessing relations between the TMS intensities, amplitude of MEPs, latency of MEPs, and duration of silent periods during the three muscle condition tasks. For each subject (S), three IIMs were constructed, first for relaxed muscles, second for isometric index finger abduction, and third for co-contraction of antagonist muscles. Each IIM contains the respective number of stimulus intensities from the individual recruitment curve and measured parameters for the relevant motor task. The criteria in IIMs are stimulus intensities, amplitude of MEPs, latency of MEPs, and silent periods. As was mentioned before, because of the high individual RMT, measurements stopped at 130% RMT in two subjects' cases, and at 120% RMT in one subject's  
Figure 3: Recruitment curves at the three muscle condition tasks and the five TMS intensities. The plots show mean values of (**a**) MEP amplitudes, (**b**) durations of silent periods, and (**c**) durations of MEP latencies. Figure 2: EMG record in abduction muscle condition task and TMS intensity 130% RMT. case. Thus, the number of IIM objects for some subjects decreases from five to four or three, respectively. Altogether, thirty IIMs were obtained for the ten subjects. Each IIM was processed by ICrAData software, version 2.5 ([[https://intercriteria.net/software/](https://intercriteria.net/software/)]([https://intercriteria.net/software/](https://intercriteria.net/software/)), accessed on 25 February 2025), and the results have been summarized in the next three tables. Table 2 includes the results for the ten subjects during the relaxed condition task. Tables 3 and 4 present ICrA outcomes when the abduction and co-contraction are considered. The results obtained after the ICrA application differ for each subject (Tables 2-4). The differences can be explained by the individual neuronal subjects' characteristics and the task performance strategy. **Case study 2. ** Finding the relations between the amplitude of MEPs, the latency of MEPs, and the durations of the silent periods themselves. ICrA is applied to thirty IIMs, but in this case, for finding the relations between MEP amplitudes, MEP latencies, and silent period durations themselves during the three muscle condition tasks. Each IIM contains data for stimulus intensities and the three MEP amplitudes (R_Ampl, A_Ampl, and C_Ampl), three MEP latencies (R_Lat, A_Lat, C_Lat), and two silent periods (A_SP, C_SP) as criteria. The objects again are different experimental cases in which the end of the TMS recruitment curves varies depending on the individual RMT. Tables 5-7 show only the results for each subject concerning the relations between the amplitude of MEPs, the latency of MEPs, and the durations of silent periods themselves. Since the correlations between TMS intensity and the three quantities have already been obtained in the previous case study, they are not presented here.