laboratory study, human, mood; magnetic field exposure, cognitive effects; event-related potentials (ERPs)
Abstract :
[en] Two double-blind studies were performed to examine magnetic field (MF) exposure effects and to determine the impact of temporal variation (continuous vs. intermittent exposure) of 100 mu T(rms) 50 Hz MF diurnal exposure on psychological and psychophysiological parameters in healthy humans. Three cephalic exposure sessions of 30-min, i.e., sham, continuous, and intermittent (15 s ON/OFF cycles) MF conditions, were involved. Each subject participated in all sessions, which were spaced at 1-wk intervals. In each session, mood ratings and performance measures were obtained before, during, or after exposure and several electrophysiological data (event-related brain potentials [ERP]) were recorded after each exposure session. These criteria were chosen to evaluate sensory functions as well as automatic and voluntary attentional processes. In experiment 1, 21 healthy male volunteers (20 to 27 years of age) were studied. Ten subjects were exposed at 13:30 h, and 11 subjects were exposed at 16:30 h. Statistically significant changes in the amplitude of ERP were observed after MF exposure in the dichotic listening task, indexing selective attention processes. Eighteen of the 21 original male volunteers took part in experiment 2, undertaken to better understand the results related to information processing involved in selective attention and control for ultradian rhythmicity. Exposure time for all the subjects was at 13:30 h. The analysis of the data again revealed significant amplitude changes of the ERP recorded in the dichotic listening task. Moreover, they demonstrated ERP latency and reaction time slowing in the oddball paradigm, a visual discrimination task after real MF exposure. These results also indicate that a low level 50 Hz MF may have a slight influence on event-related potentials and reaction time under specific circumstances of sustained attention.
Disciplines :
Neurosciences & behavior
Author, co-author :
Crasson, Marion ; Université de Liège - ULiège > Département des sciences cliniques > Psychiatrie et psychologie médicale
Legros, Jean-Jacques ; Université de Liège - ULiège > Département des sciences cliniques > Département des sciences cliniques
Legros, Willy ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Dép. d'électric., électron. et informat. (Inst.Montefiore)
Other collaborator :
Scarpa, Patrick
Language :
English
Title :
50 Hz Magnetic Field Exposure Influence on Human Performance and Psychophysiological Parameters: Two Double-Blind Experimental Studies
Alternative titles :
[fr] Influence de l'exposition à un champ magnétique 50 Hz sur la performance humaine et des paramètres psychophysiologiques
Publication date :
December 1999
Journal title :
Bioelectromagnetics
ISSN :
0197-8462
eISSN :
1521-186X
Publisher :
John Wiley & Sons, Hoboken, United States - New York
Volume :
20
Issue :
8
Pages :
474-86
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Effets des champs électriques et magnétiques sur la santé, BBEMG
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