De Brabander B, Gerits P, Boone C
Universiteit Antwerpen, België.
Percept Mot Skills. 1990 Dec;71(3 Pt 2):1091-8. doi: 10.2466/pms.1990.71.3f.1091.
In this experiment, which is partly a replication of two earlier ones, we tested the hypothesis that the brain self-regulates its own arousal and activation. According to the underlying paradigm, arousal effectuates slower reaction times and depressed EMG activity after an unexpected preparatory signal on a visuospatial choice-reaction task, whereas activation effectuates faster reaction times and elevated EMG activity after an unexpected preparatory signal on a semantic choice-reaction task. The results basically confirm the predictions. The relationship of locus of control scores of the subjects with tonic and phasic EMG activity was also explored. The results clearly and consistently show elevated tonic EMG activity in the left forearm for subjects with an external locus of control. Together the results suggest that the mechanisms involved are partly preconscious and probably related to central catecholaminergic activation systems.
在这个部分重复了两个早期实验的实验中，我们检验了大脑自我调节自身唤醒和激活的假设。根据潜在范式，在视觉空间选择反应任务中，意外预备信号后唤醒会导致反应时间变慢和肌电图活动降低，而在语义选择反应任务中，意外预备信号后激活会导致反应时间变快和肌电图活动增强。结果基本证实了预测。我们还探讨了受试者的控制点分数与静息和相位肌电图活动的关系。结果清楚且一致地表明，具有外部控制点的受试者左前臂的静息肌电图活动增强。综合这些结果表明，所涉及的机制部分是前意识的，并且可能与中枢儿茶酚胺能激活系统有关。
