一种纯内源性成分的事件相关脑电位

A pure endogenous event related potentials

闪现刺激物诱发的视觉事件相关脑电位（ Ｅ Ｒ Ｐｓ）中，只有那些分布在较晚时域中的波，例如 Ｐ３００、 Ｎ４００ 等，内源性成分占优势，并与大脑的认知活动建立了较确切联系．本文报告一种模拟人类自然阅读时的事件相关脑电位（ Ｉ Ｎ Ｒ Ｅ Ｒ Ｐｓ）．这种 Ｉ Ｎ Ｒ Ｅ Ｒ Ｐｓ 的形态学特征，不受注意的自动俘获效应的影响，不论是较晚还是较早时域中的波，都几乎是纯内源性的，并显示出了明显的心理学含义．我们还发现：对于同样的认知作业，纯内源性的 Ｉ Ｎ Ｒ Ｅ Ｒ Ｐｓ 有额外的异常显著的较早波．这些发现提示： Ｉ Ｎ Ｒ Ｅ Ｒ Ｐｓ

Among visual event related potential (ERP) waves elicited by flashstimuli,only those later ERP waves,such as the P300,N400,are predominately endogenous.They have been related to cognitive activities of the human brain.Here we report a novel type of visual event related potential measured during imitating natural reading (INR ERP).The morphological characteristics of the INR ERPs were free from the effect of automatically capturing attention.Both the later and the earlier INR ERP waves were purely endogenous and expressed obvious psychological implications.In addition,we also found some prominent earlier waves in purely endogenous INR ERPs These findings suggest the INR ERPs contain more information and may reflect complete cognitive processes more exactly.