Somatosensory evoked potential correlates of psychophysical magnitude estimations for air-puff stimulation of the foot in man

1992 ◽  
Vol 92 (2) ◽  
Author(s):  
I. Hashimoto ◽  
T. Gatayama ◽  
K. Yoshikawa ◽  
M. Sasaki
Keyword(s):  
Evoked Potential ◽  
Somatosensory Evoked Potential ◽  
Psychophysical Magnitude Estimations ◽  
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

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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