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Influence of electrode site and size on variability of magnetic evoked potentials
Author(s) -
Dunnewold Robert J.W.,
van der Kamp Wim,
van den Brink Antoinette Maassen,
Stijl Marion,
van Dijk J. Gert
Publication year - 1998
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/(sici)1097-4598(199812)21:12<1779::aid-mus23>3.0.co;2-o
Subject(s) - amplitude , electrode , electrophysiology , evoked potential , electroencephalography , electrodiagnosis , nuclear magnetic resonance , anatomy , chemistry , physics , neuroscience , audiology , medicine , psychology , cardiology , optics
Successive magnetic evoked potentials (MEPs) concern varying motor neurons. We investigated whether this MEP‐specific source of variability depends on electrode site and size. Amplitude variability (standard deviation) was largest over the center of the hypothenar muscles. Latencies were longer at distal and proximal sites than at the center site. Large electrodes (10 cm 2 ) did not decrease this source of amplitude variability compared with EEG electrodes, in contrast to other sources of variability. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21: 1779–1782, 1998