The SD F0 means of the rest and SES durations related to electrode placement on the ISLN are shown in figure 2.
Table 1 demonstrates jitter, shimmer, HNR, mean intensity, maximum intensity, and minimum intensity results related to electrode placement on the ISLN.
The present study examined the possibility of imposing changes on the vocal cords via SES on ISLN topical location on skin.
Nonetheless, our findings demonstrated that it was possible through the stimulation of the vocal cords directly via the ISLN.
As a result, heightening of aperiodicity can be concluded consequent to electrical stimulation on the ISLN.
20) stimulated the ISLN by inserting needle electrodes around the ISLN for normal awake participants and reported voice break during phonation in 1 of their 3 subjects.
22) Accordingly, the current method applied in the present research had more power to penetrate deeply and reach the ISLN.
The other reasons include different methods in electrode placement, different stimulated organs (internal laryngeal muscles versus ISLN in our study), different sizes of electrodes, and dissimilar time of recording voice (after or during SES presentation, as was the case in the present study).
This finding confirms the notion that by dispossessing and excluding the ISLN from the SES-affected area and also by delivering the current at the nearest place to the vocal cords and the recurrent nerve, SES cannot stimulate the vocal cords or the recurrent nerve.
Although the findings on perturbation and intensity suggested exacerbation of voice during SES presentation, they indicated the effectiveness of SES in impacting the internal laryngeal muscles from the ISLN as a gate for motor responses in the vocal cords.