Effects of movement on somatosensory N20m fields and high-frequency oscillations.

Abstract:

:Somatosensory evoked fields were recorded to determine the effects of movement and attention on high-frequency oscillations during active finger movements of the ipsilateral and contralateral sides in response to electrical stimulation of the median nerve. A whole-scalp neuromagnetometer was used to record somatosensory evoked fields from eight subjects following electric median nerve stimulation at the wrist. The following three sessions were performed: (1). rest, (2). movement of fingers on the ipsilateral in response to stimulation and (3). movement of fingers on the contralateral in response to stimulation. The somatosensory evoked fields with a wide-bandpass (0.1-1000 Hz) were recorded. High-frequency oscillations and N20m were separated by subsequent high-pass (> 300 Hz) and low-pass (< 300 Hz) filtering. The maximum amplitude of high-frequency oscillations decreased during finger movements accompanying a decrease in somatosensory N20m dipole strength. Activation of the motor cortex appeared to suppress both the amplitude of high-frequency oscillations and the N20m dipole strength.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Inoue K,Harada T,Kaseda Y,Mimori Y,Hashizume A,Hashimoto I,Matsumoto M

doi

10.1097/00001756-200210280-00006

subject

Has Abstract

pub_date

2002-10-28 00:00:00

pages

1861-4

issue

15

eissn

0959-4965

issn

1473-558X

journal_volume

13

pub_type

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