Multichannel detection of magnetic compound action fields with stimulation of the index and little fingers

Electroencephalography and Clinical Neurophysiology
I HashimotoK Yoshikawa

Abstract

Magnetic compound action fields (CAFs) over the right arm were measured from 63 sensor positions with two 7-channel SQUID gradiometer systems following electrical stimulation of the index and little fingers as well as the ring finger separately. The wave forms of the CAFs were primarily biphasic, corresponding to the depolarization and repolarization currents of the stimulated nerves. Maximum amplitudes of the CAFs were 60-140 fT for the index finger stimulation and 40-90 fT for the little finger stimulation. The field mapping of the CAFs revealed a propagating quadrupolar pattern with different distributions for the index and little fingers. The results agree with the anatomical location of the median and ulnar nerves for the index and little finger stimulation respectively. The isofield maps, due to ring finger stimulation, showed complex patterns as a result of simultaneous activation of the median and ulnar nerves. By comparing the amplitudes of the maxima of the CAFs due to index finger stimulation with those after median nerve stimulation at the wrist, the numerical ratios of the constituent digital nerve fibers for the index finger within the median nerve at the wrist were estimated. The ratios of 0.14-0.41 (mean 0.27), ...Continue Reading

References

Oct 1, 1991·Electroencephalography and Clinical Neurophysiology·I HashimotoS Yokoyama
Mar 1, 1989·Electroencephalography and Clinical Neurophysiology·R HariS L Joutsiniemi
Apr 1, 1989·Electroencephalography and Clinical Neurophysiology·I HashimotoM Nomura
Jun 1, 1989·Biophysical Journal·L TrahmsP Aust
Dec 1, 1994·Electroencephalography and Clinical Neurophysiology·I HashimotoH Okazaki

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Citations

Sep 29, 1998·Electroencephalography and Clinical Neurophysiology·B M MackertP Marx
Aug 24, 1999·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·I HashimotoK Sakuma
Jul 1, 1997·Electroencephalography and Clinical Neurophysiology·B M MackertP Marx
Jul 22, 2015·Proceedings of the National Academy of Sciences of the United States of America·Adam T TierneyNina Kraus
Aug 6, 2000·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·I Hashimoto

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