Influence of movement onset prediction and postural control preparation on postural muscle activity associated with upper limb movement

许多先前的研究发现，控制站立姿势的腿部和躯干姿势肌肉的激活先于快速移动手臂的局灶肌肉。根据之前的研究，我们假设当运动的开始容易预测，并且姿势控制的准备充分时，姿势肌肉的前期激活将会更容易。采用事件相关电位（P300）研究了听觉刺激下围棋信号驯服的不确定性与诱发脑电位的关系。在预警信号和放行信号之间的不同准备阶段进行反应任务，并对可能负变异（CNV）进行分析。在刺激呈现概率为15%和45%时，P300的振幅显著增大。前三角肌对声音刺激的反应时间在45%概率下明显早于15%概率下。直棘和腓肠肌到前三角肌的激活起始率为45%，高于15%。在两种反应任务中，P300的振幅与起病最早的体位肌和竖脊肌呈显著负相关。综合后期CNV和后期CNV斜率在3.5 s时期显著小于2.0 s时期。gasbncnemius在3.5 s时期的启动时间明显早于3.0 s时期。腓肠肌活动开始时间与综合晚CNV有显著相关性。

Many previous studies have found that the activation onset in the postural muscles of the legs and trunk that control standing postures precedes that in the focal muscles that rapidly move the arms. Based on the previous researches, we presumed that when the initiation of movement is easy to predict and the preparation for postural control is adequate, the preceding activation of postural muscles will be facilitated.Relationship between uncertainty of go signal taming and evoked brain potential was examined using event related potential (P300) during odd-ball paradigm with auditory stimulation. Reaction task was conducted under the various preparatory periods between warning signal and go signal, and contingent negative variation (CNV) was analyzed.The amplitude of P300 was significantly large in the stimulation presentation probability 15% compared with 45%. The reaction time of the anterior deltoid to the sound stimulation was significantly earlier in 45% probability than in 15% probability. The activation onset of the erecter spinae and gastrocnemius to the anterior deltoid were earlier in 45% probability than in 15% probability. Significant negative correlations were observed between the amplitude of P300 and postural muscle showing the earliest onset, and the erecter spinae in both reaction tasks.Integrated late CNV and slope of late CNV were significantly smaller in the 3.5-s period than in the 2.0-s period. Start time of gasbncnemius was significantly earlier in the 3.5-s period than in the 3.0-s period. A significant correlation was found between start time of gastrocnemius activity and integrated late CNV.