注意状态对事件相关电位的影响研究

Effect of Attentional Condition on Event-related Potentials

目的 :研究不同注意状态下事件相关电位的变化特点。方法 :智能正常年轻人 18例 ,采用oddball模式 ,非靶刺激为 80 %的 75 0Hz低频短音 ,靶刺激为 2 0 %的 2 0 0 0Hz高频短音。利用NicoletPathfinderⅡ型诱发电位仪 ,记录主动分辨靶刺激时 ,计数 /不计数状态下事件相关电位各波潜伏期和P3波幅的变化。结果 :与计数靶刺激时比 ,在不计数时P3波幅显著降低 (P <0 0 1) ,P3潜伏期及其余各波潜伏期变化无显著性意义。结论 :P3 0 0波幅与注意密切相关 ,P3潜伏期不易受被试注意力的影响 。

Objective: To study the effect of active attention with/without target counting on event-related potentials (ERPs) Method: ERPs were elicited by non-target (750 Hz, 80%) and target (2000 Hz, 20%) stimuli in an auditory oddball paradigm for 18 healthy young subjects Results:Compared to the active attention with target counting manner, P3 amplitude was significantly smaller when without target counting (P<0 01) No effect was found on the latencies of P3 and other waves Conclusion: P300 is closely related to attention The amplitude of P3 reflects the attentional resource allocation while the latency is relatively stable and not affected by subject's attentional conditions