Jodo E, Inoue K
Department of Psychology, Faculty of Arts and Letters, Tohoku University, Sendai, Japan.
Electroencephalogr Clin Neurophysiol. 1990 Sep;76(3):249-57. doi: 10.1016/0013-4694(90)90019-g.
Previous studies have reported that there are differences in latency and scalp topography between Go-P300 and NoGo-P300 in a Go/NoGo task. This study investigated whether these differences could be observed after intensive practice. Subjects performed the task at 1 session (200 trials) per day for 6 days. In session 1, P300 latency was significantly later to the NoGo stimuli than to the Go stimuli, while in session 6 P300 latency was significantly shorter to the NoGo stimuli than to the Go stimuli. Reaction time (RT) was significantly shortened by practice, but P300 latency to the Go stimuli was not affected by practice. The scalp topography of the P300 was not varied by practice, having a parieto-central distribution to the Go stimuli, a centro-parietal one to the NoGo stimuli. These findings show that the temporal relation between Go-P300 and NoGo-P300 can be apparently reversed by practice. Since the Go-P300 differed from the NoGo-P300 in the effects of practice, our results suggest the possibility that the Go-P300 and the NoGo-P300 may be functionally separate P300 components.
先前的研究报告称，在Go/NoGo任务中，Go-P300和NoGo-P300在潜伏期和头皮地形图方面存在差异。本研究调查了在强化练习后是否能观察到这些差异。受试者每天进行1次实验（200次试验），共进行6天。在第1次实验中，NoGo刺激的P300潜伏期显著长于Go刺激，而在第6次实验中，NoGo刺激的P300潜伏期显著短于Go刺激。反应时（RT）通过练习显著缩短，但Go刺激的P300潜伏期不受练习影响。P300的头皮地形图不因练习而变化，Go刺激的P300在顶中央分布，NoGo刺激的P300在中央顶分布。这些发现表明，Go-P300和NoGo-P300之间的时间关系可通过练习明显逆转。由于Go-P300和NoGo-P300在练习效果上存在差异，我们的结果提示Go-P300和NoGo-P300可能是功能上独立的P300成分。
