集中維持機能(TAF)に関する研究(XV) : TAFの優劣と脊髄前角細胞の興奮準位について

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Physiological analysis has already been made on the characteristic pattern of the ability of concentration maintenance as to the brain waves, especially the alpha wave. The purpose of this study is to investigate the inherent level of the TAF in relation to H-wave recovery curve which is considered as an indicator of the excitability level of the spinal motoneurone.Thirty seven examinees, all healthy male medical students, were administered the TAF-test and the recording of H-wave recovery curve from the right lower extremity. According to the values of TAF-L the examinees were classified into two groups, excellent in TAF-L of 0.28 to 1.08 and inferior in TAF-L of 1.29 to 2.00. The recovery rate in H-wave was higher in the excellent group at the time intervals of 70, 80, 90 and 100 msec between the first conditioning shock and the second test shock compared with that of the inferior group.Eccles et al indicate that the spinal motoneurones consist of two kinds of neurone, tonic and phasic, and the duration of after-hyper-polarization is 130 to 200 msec in the tonic motoneurone and 50 to 110 msec in the phasic one. Granit et al observed that the distribution of the tonic and phasic ventral horn cells in cat extensors is 47% and 53% respectively.Our experiment revealed that the excellent group showed a significantly higher response to the second shock than that of the inferior group at the time intervals from 70 to 100 msec which are contained in the process of after-hyper-polarization, or the relative refractory period. This fact suggests that the inherent level of the TAF may have a certain relationship with the excitability level of the spinal motoneurone, that is, the distribution of tonic and phasic motoneurones in the spinal ventral horn cells as well as the control from the higher nervous system.
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集中維持機能(TAF)に関する研究(XV) : TAFの優劣と脊髄前角細胞の興奮準位について

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