Personality and individual differences in spinal motoneuronal excitability.
Personality and individual differences in spinal motoneuronal excitability.
复制标题
脊髓运动神经元兴奋性的个性和个体差异。
DOI：
10.1111/j.1469-8986.1988.tb00951.x
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发表时间：
1988
期刊：
影响因子：
3.7
通讯作者：
F. Bylsma
中科院分区：
文献类型：
--
作者：
R. T. Pivik;R. Stelmack;F. Bylsma
虽然感觉寻求的个体差异的特点是在运动行为的表达上存在广泛的差异，但这些特征的心理生理学相关性尚未得到广泛的研究。本研究采用感觉寻求量表（Zuckerman，1979）和艾森克人格问卷（Eysenck & Eysenck，1975），对年轻成人复合肌肉动作电位的反应特征、H反射和相关运动反应进行了研究。使用两个独立的程序观察反射反应的变化。配对刺激法评估在不同脉冲间隔下反射幅度恢复的程度。第二种方法，称为同源突触抑制，检查运动神经元的兴奋性，以不同的速度提供的脉冲列车。人格群体在引起肌肉动作电位或这些电位的神经传导速度所需的刺激强度方面没有差异。高去抑制和高外倾性组表现出减少运动神经元兴奋性的反射恢复功能的分析评估。对于外倾性，同突触抑郁测量也观察到类似的效果。这些结果表明，去抑制和外向性的个体差异可以归因于中枢神经系统运动系统活动的离散水平。在这种情况下，刺激寻求行为并不区分刺激的需要（初始hypoexcitability），而是反映了减少运动兴奋性，这变得明显，一旦运动神经元活动启动。
Although individual differences in sensation-seeking are characterized by a wide range of differences in the expression of motor behavior, the psychophysiological correlates of these characteristics have not been extensively explored. In the present investigation the response characteristics of compound muscle action potentials, the H-reflex and associated motor responses, were examined in young adult subjects who were administered the Sensation Seeking Scale (Zuckerman, 1979) and the Eysenck Personality Questionnaire (Eysenck & Eysenck, 1975). Variations in reflex responses were observed using two independent procedures. A paired stimulus method assessed the extent of reflex amplitude recovery at varying pulse intervals. A second method, termed homosynaptic depression, examined motoneuronal excitability in response to trains of pulses delivered at varying rates. The personality groups did not differ with respect to the intensity of stimulation required to elicit muscle action potentials or the nerve conduction velocities of those potentials. High disinhibition and high extraversion groups displayed reduced motoneuronal excitability as assessed by analysis of reflex recovery functions. For extraversion, similar effects were observed with the homosynaptic depression measure. These results demonstrate that individual differences in disinhibition and extraversion can be referred to discrete levels of CNS motor system activity. In this context, stimulus seeking behavior is not distinguished by a need for stimulation (initial hypoexcitability) but reflects instead reduced motor excitability which becomes evident once motoneuronal activity is initiated.