Japanese Journal of Clinical Neurophysiology
Online ISSN : 2188-031X
Print ISSN : 1345-7101
ISSN-L : 1345-7101
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Original Article
  • Kazuhiko Goto, Takenao Sugi, Takuro Ikeda, Takao Yamasaki, Shozo Tobim ...
    2019 Volume 47 Issue 6 Pages 509-518
    Published: December 01, 2019
    Released: December 03, 2019

    [Objective] The relationship between motion stimuli and binocular disparity stimuli was investigated using visual evoked potentials (VEPs). [Method] VEPs were recorded from 13 healthy young adults (males, aged 21–24). Three types of visual stimuli were used optic flow (OF), random dot stereogram (RDS), and a combination of these two types (RDS&OF). [Result] VEPs for OF were composed of two negative peaks around 190 ms (N190) and 250 ms (N250) and one positive peak around 250 ms (P250). VEPs for RDS consisted of two negative peaks around 200 ms (N200) and 300 ms (N300), respectively. VEPs for RDS&OF included the N190, N200, N250, P250, and N300 peaks. The latencies of N250 and P250 differed significantly between OF and RDS&OF, however, N200 amplitudes between RDS and RDS&OF were the same. Signal source estimation by sLORETA suggested that OF and RDS responses were related to motion perception and form perception, respectively. [Discussion] OF and RDS stimuli results showed similar tendencies to those from the previous study. Although the RDS&OF and OF results were similar, it was considered that responses concerning motion perception could be affected by binocular disparity.

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  • Fumiko Hirashima, Toshio Shimizu, Kiyomi Koike, Tatsuya Abe, Tetsuo Ko ...
    2019 Volume 47 Issue 6 Pages 519-525
    Published: December 01, 2019
    Released: December 03, 2019

    In Japan, it was well known that the compound muscle action potential (CMAP) of the extensor digitorum brevis (EDB) muscle with fibular nerve stimulation could not be often obtained in normal subjects. It is suggested there is subclinical fibular nerve palsy due to the Japanese traditional “floor sitting” lifestyle, but there have been no corroborative studies. We received the nerve conduction study results in 139 healthy Japanese subjects without neurological deficits, which were recorded from 1985 to 2015. CMAP amplitudes from fibular nerve and tibial nerve stimulations in 1985 showed lower than that in 2005 and in 2015. These amplitudes is not demonstrated a relationship with BMI and body height. We considered the interdecadal changes were due to change in our lifestyle.

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