Sensations and reaction times evoked by electrical sinusoidal stimulation

Current perception threshold and reaction time in the assessment of sensory peripheral nerve fibers through sinusoidal electrical stimulation at different frequencies

“…The same behavior was obtained by Félix et al (2009), who reported lower RT values. This difference might be due to the distinct methodologies adopted.…”

“…This difference might be due to the distinct methodologies adopted. While Félix et al (2009) determined the RT value as the subject shortest response time in a series of 10 stimuli at the intensity of 1.1 × ST, in this study, this parameter was determined as mean RT during the validation stage of ST at 1.0 × ST intensity level.…”

“…Recently, Félix et al (2009) have associated the Reaction Time (RT), which corresponds to the time elapsed between the application of a stimulus and the indication of perception by the subject, with different stimulation frequencies whenever stimuli with intensity equal to 1.1 times ST are applied, at the frequencies of 5, 250, and 2,000 Hz, and twice ST, at the frequency of 5 Hz. Findings suggest that a 2,000 Hz stimulus would excite Aβ-fibers, a 250 Hz one, Aβ-or Aδ-fibers, and a 5 Hz one, Aβ-, Aδ-or C-fibers, according to Pimentel et al (2006) and Liu et al (1996).…”

Cortical Alpha Oscillation During 3 kHz Steady-State Sinusoidal Electric Current Stimulation

“…However, it also suggests that with increasing stimulus intensity, participants begin to report words related to thin fibers. This could be either due to recruitment of small-diameter fibers -which is in accordance with has been seen for pulse stimulation [10,11] but not for sinusoidal stimuli [24] -or discomfort perceived due to the higher intensities. In addition, studies with laser stimuli (i.e., used to assess nociceptive conduction) have shown that after stimulation there is a profile of alpha ERS followed by ERD, at the primary somatosensory, parasylvian and medial frontal cortices [28], which differs from the profile observed in the present study.…”

“…They were allowed to a forced choice maximum of three words from the list. Similar methodology was employed in previous studies [16,24,25]. In addition, participants were asked to mark a line indicating stimulation subjective discomfort perceived in a continuous line, whose extremities ranged from "No discomfort at all" to "Extremely uncomfortable".…”