Selective temporal shift in the somatosensory evoked potential produced by chronic stimulation of the human index finger

1992 ◽  
Vol 88 (1) ◽  
pp. 219-223
Author(s):  
S. C. Gandevia ◽  
K. Ammon
Keyword(s):  
Evoked Potential ◽  
Index Finger ◽  
Somatosensory Evoked Potential ◽  
Chronic Stimulation ◽  
Temporal Shift ◽  
Stimulation Of

Adaptation of the cortical somatosensory evoked potential following pulsed pneumatic stimulation of the lower face in adults

2015 ◽  
Vol 1622 ◽  
pp. 81-90 ◽  
Author(s):  
Rebecca Custead ◽  
Hyuntaek Oh ◽  
Austin Oder Rosner ◽  
Steven Barlow
Keyword(s):  
Evoked Potential ◽  
Somatosensory Evoked Potential ◽  
Lower Face ◽  
Stimulation Of

scholarly journals A STUDY ON SOMATOSENSORY EVOKED POTENTIAL PATTERNS ACCORDING TO VARIOUS VIBROTACTILE STIMULATION: FREQUENCIES AND INTENSITIES

2020 ◽  
Vol 20 (09) ◽  
pp. 2040015
Author(s):  
MI-HYUN CHOI ◽  
JIN-JU JUNG ◽  
JE-HYEOP LEE ◽  
HYUNG-SIK KIM ◽  
HYUN-JUN KIM ◽  
...  
Keyword(s):  
High Frequency ◽  
Evoked Potential ◽  
Index Finger ◽  
Low Frequency ◽  
Clinical Applications ◽  
Distal Phalanx ◽  
Somatosensory Evoked Potential ◽  
Vibrotactile Stimulation ◽  
Somatosensory Area ◽  
Normal Cognitive Function

This study investigates somatosensory evoked potential (SEP) patterns in the C3 somatosensory area with varying frequency and intensity of vibrotactile stimuli. The study subjects included 13 men ([Formula: see text] years) and seven women ([Formula: see text] years) who were right-handed and had normal cognitive function. The participants were subjected to three intensity levels (0.25, 0.38 and 1.3[Formula: see text]g) and eight frequencies (10, 50, 100, 150, 200, 225, 250 and 300[Formula: see text]Hz) of vibrotactile stimuli on the distal phalanx of their right index finger. The peak values of SEP patterns generated in response to high-frequency vibrotactile stimuli were greater than those generated because of low-frequency flutter. Moreover, the peak values increased as the stimulus intensity increased from 1[Formula: see text]g to 3[Formula: see text]g. In these results, the maximum and minimum peak, and peak to peak values of SEP pattern in the C3 somatosensory area increased with an increase in the stimulation intensity and frequency of the vibrotactile stimuli. Data on the SEP patterns generated in response to various frequencies and intensities of somatosensory stimuli and the development of relevant databases will elucidate the various clinical applications and applicable domains where SEP assessment can be beneficial.

Exploring the specific time course of interhemispheric inhibition between the human primary sensory cortices

2014 ◽  
Vol 112 (6) ◽  
pp. 1470-1476 ◽  
Author(s):  
Sonia M. Brodie ◽  
Anica Villamayor ◽  
Michael R. Borich ◽  
Lara A. Boyd
Keyword(s):  
Time Course ◽  
Evoked Potential ◽  
Significant Inhibition ◽  
Somatosensory Evoked Potential ◽  
Interhemispheric Inhibition ◽  
Neurophysiological Mechanism ◽  
Sensory Cortices ◽  
The Right ◽  
Specific Timing ◽  
Stimulation Of

The neurophysiological mechanism of interhemispheric inhibition (IHI) between the human primary sensory cortices (S1s) is poorly understood. Here we used a paired median nerve somatosensory evoked potential protocol to observe S1-S1 IHI from the dominant to the nondominant hemisphere with electroencephalography. In 10 healthy, right-handed individuals, we compared mean peak-to-peak amplitudes of five somatosensory evoked potential components (P14/N20, N20/P25, P25/N30, N30/P40, and P40/N60) recorded over the right S1 after synchronous versus asynchronous stimulation of the right and left median nerves. Asynchronous conditioning + test stimuli (CS+TS) were delivered at interstimulus intervals of 15, 20, 25, 30, and 35 ms. We found that, in relation to synchronous stimulation, when a CS to the left S1 preceded a TS to the right S1 at the short intervals (15 and 20 ms) the amplitude of the cortical N20/P25 complex was significantly depressed, whereas at the longer intervals (25, 30, and 35 ms) significant inhibition was observed for the thalamocortical P14/N20 as well as the cortical N20/P25 components. We conclude that the magnitude of S1 IHI appears to depend on the temporal asynchrony of bilateral inputs and the specific timing is likely reflective of a direct transcallosal mechanism. Employing a method that enables direct S1 IHI to be reliably quantified may provide a novel tool to assess potential IHI imbalances in individuals with neurological damage, such as stroke.

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