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The relationship in gating effects between short-latency and long-latency somatosensory-evoked potentials.
- Source :
-
Neuroreport [Neuroreport] 2011 Dec 21; Vol. 22 (18), pp. 1000-4. - Publication Year :
- 2011
-
Abstract
- We investigated the relationship between short-latency and long-latency somatosensory-evoked potentials (SEPs) relating to voluntary movement. In general, the amplitudes of short-latency components in SEPs are attenuated during movement, whereas those of long-latency are enhanced, and this phenomenon is termed 'gating effects'. This study aimed to examine the relationship of changes in amplitude between short-latency and long-latency SEPs. SEPs were recorded from 11 participants at Fz, Cz, Pz, and C4' by stimulating the left median nerve. Two tasks were conducted; Control and Movement. In Control, the participant was asked to relax with no specific task. In Movement, the participant was encouraged to continue a rapid drumming motion of all fingers of the left hand at a self-paced rate. The amplitudes of short-latency SEPs, the P25 at C4' and N30 at Fz, were significantly smaller in the Movement than Control condition. By contrast, the amplitudes of long-latency SEPs, the N140 at Fz, Cz, and Pz were significantly larger in Movement than Control condition. Moreover, a significant positive correlation was observed in the rate of amplitude change between the frontal N30 and vertex N140, indicating that for the participants with a frontal N30 of smaller amplitude during Movement, the amplitude of the vertex N140 was smaller. We inferred that the neural activities in movement-related cortices affected the sources for the frontal N30 and vertex N140 in the same neuronal network simultaneously.
Details
- Language :
- English
- ISSN :
- 1473-558X
- Volume :
- 22
- Issue :
- 18
- Database :
- MEDLINE
- Journal :
- Neuroreport
- Publication Type :
- Academic Journal
- Accession number :
- 22045259
- Full Text :
- https://doi.org/10.1097/WNR.0b013e32834dc296