 |
| Research article summary (published 30 Mar 2002): |
New concept for the recovery function of short-latency somatosensory evoked cortical potentials following median nerve stimulation.
Full Abstract
OBJECTIVES:
We investigated the recovery function of the cortical components of somatosensory evoked potentials (SEP) at a very short interstimulus interval (ISI, less than 10 ms) using an integrative computer system in 10 healthy subjects (age, 27-38 years).
METHODS:
The SEP and nerve action potentials were recorded at P3 with a reference of Fz in the International 10-20 System and the ipsilateral Erb's point, respectively. Double stimulation of the right median nerve with an ISI from 0.5 to 100 ms was performed to analyze the N20 and P30 components at less than 10 ms.
RESULTS:
The P30 component was recognized following the second stimulation at an ISI of over 1 ms, while N20 was not identified at an ISI of less than 9 ms. There appeared a sub-component of SEP at 1-12 ms ISI, which was not identified following a single stimulation under control conditions.
CONCLUSIONS:
The results indicated that the recovery function of given SEP components was not simply determined by the number of synapses interposed between the stimulus site and the generator source of the response in the central nervous system, but there might be a structural or functional process of low-cut filtering in the primary sensory cortex. We also considered that the final SEP waveform determined by the excitatory and inhibitory balance of the components, which could be changed with ISI, and that the existence of the sub-component might cause the complexity of the recovery curve and large inter-individual difference of the waveform.
Learn Faster Today Improve your study skills
Author information
Author/s: Hoshiyama, Minoru (M); Kakigi, Ryusuke (R);
Affiliation: Department of Health Sciences, Faculty of Medicine, Nagoya University, 461-8673, Nagoya, Japan. hosiyama(-atsign-)nips.ac.jp
Journal and publication information
Publication Type: Journal Article
Journal: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology (Clin Neurophysiol), published in Netherlands. (Language: eng)
Reference: 2002-Apr; vol 113 (issue 4) : pp 535-41
Dates: Created 2002/04/16; Completed 2002/06/24; Revised 2008/09/10;
PMID: 11955998, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
External Links for this article (including full text providers, if available):
Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.
This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.
MeSH headings (categories)
This article was linked to the MESH Headings shown below.
|
|
Related articles
This article has not been indexed for related articles as yet, however you can still use the live related article search links below.
See a large map of 100+ related articles.