Effect of digital nerve stimuli on responses to electrical or magnetic stimulation of the human brain.

in Journal of Physiology (1992), 447

1. Reflexes were elicited in the first dorsal interosseous muscle of seven normal subjects by electrical stimulation of the digital nerves of the index finger at 3 times perceptual threshold while ... [more ▼]

1. Reflexes were elicited in the first dorsal interosseous muscle of seven normal subjects by electrical stimulation of the digital nerves of the index finger at 3 times perceptual threshold while subjects maintained a constant voluntary contraction of the muscle. The average response in the surface-rectified electromyogram (EMG) consisted of an early inhibitory (I1) component followed by a later excitation (E2). 2. Low intensity anodal electrical or magnetic scalp stimuli were given over the motor cortex in order to elicit muscle responses within the period of the I1 and E2 reflex components. 3. Compared with control responses elicited in the absence of digital nerve stimulation, responses to electrical cortex stimulation were suppressed in the I1 period and facilitated during the E2 period of the reflex. In contrast, responses evoked by magnetic stimulation were suppressed during I1 and also for the first 10 ms or so of the E2 response. Magnetically evoked responses were facilitated during the later part of the E2 reflex. 4. Similar effects were seen when the probability of firing of single motor units was studied. 5. In three subjects, small taps were given to the abducted index finger in order to stretch the first dorsal interosseous muscle and evoke reflexes which were of comparable size to the E2 reflex evoked by digital nerve stimulation. In contrast to the experiments in which digital nerve stimuli were given, responses evoked by magnetic stimulation over motor cortex were facilitated at all times during the course of the reflex evoked when the muscle was stretched. 6. We conclude that single electrical stimuli applied to the digital nerves can reduce for a short period the excitability of motor cortex to magnetic stimulation. This occurs at a time when the same stimulus is evoking an excitatory (E2) reflex in the average surface-rectified EMG. [less ▲]

Etat de l’environnement de la commune de Bassenge

Report (1992)

Nouvelles méthodes de lutte

in Revue de l'Agriculture (1992), Hors série

HD160529: a new galactic Luminous Blue Variable

(1992)

Not Available

De l'Etat de droit à l'état des droits

in Journal des Procès (1992), (213), 39-44

Lutte intégrée

in Revue de l'Agriculture (1992), 45

Les facteurs sous-jacents à l'étude et susceptibles d'influencer les options du schéma de structure communal

in Environnement et Société (1992), 9/10

Analyse de certains facteurs "externes" au projet d'aménagement mais exerçant une influence déterminante sur ses orientations : la confrontation des objectifs communaux et régionaux, les contraintes ... [more ▼]

Analyse de certains facteurs "externes" au projet d'aménagement mais exerçant une influence déterminante sur ses orientations : la confrontation des objectifs communaux et régionaux, les contraintes techniques et politiques locales, les groupes de pression divers. [less ▲]

Dendrochronologie en Belgique et régions limitrophes

in Archaeologia mediaevalis (1992), 15

This is a presentation of dendrochronological analysis of Laboratory of ULg during the year 1991 in the following cities: Brussels (B), Enghien (B), Gent (B), Liège (B), Maastricht (Nl), Metz (F), Seneffe ... [more ▼]

This is a presentation of dendrochronological analysis of Laboratory of ULg during the year 1991 in the following cities: Brussels (B), Enghien (B), Gent (B), Liège (B), Maastricht (Nl), Metz (F), Seneffe (B) and Saint-Hubert (B) [less ▲]

Entretien avec Jacques PELZER

Learning material (1992)

Vie et parcours du musicien liégeois de renommée internationale

Etude archéologique et dendrochornologique de la maison du Pléban à Dinant

in Archaeologia mediaevalis (1992), 15

The "Maison du Pléban" in Dinant is a timber framed house with old parts of the end of the 15th century, modified and enlarged during the 16th and 18th centuries.