汉词再认过程中回忆及熟悉感判别机制的ERPs研究

目的：采用汉语双字词对再认过程中额区新旧效应与熟悉感判别有关、顶区新旧效应与回忆有关的“ERP熟悉感，回忆假说”进行检验。方法：40名大学生参与汉词再认测验，同时记录EEG，离线处理后对旧词、类似词(错判为“旧”)、类似词(正确判为“新”)、及新词诱发出的4类ERPs的主要成分进行了比较。结果：旧词与错判为“旧”的类似词在额区诱发的N300峰值均显著大于新词，而旧词与错判为“旧”的类似词之间无显著性差异。此外，旧词所诱发的LPC波幅显著大于新词与错判为“旧”的类似词，而新词与错判为“旧”的类似词比较未发现显著差异。结论：汉词再认的ERP新旧效应包括额区新旧效应及顶区新旧效应两种成分，其中额区新旧效应与熟悉感判别过程有关。顶叶新旧效应与回忆过程有关。汉词再认的额区新旧效应呈负走向，可能与采用的汉语双字词材料性质有关。

Dissociating Recollection from Familiarity in Chinese Words Recognition: An Event-related Potential Study

Objective: Using Chinese words to examine the claim that the frontal ERP old/new effect is related to familiarity and the parietal old/new effect is related to recollection (the ERP familiarity/recollection hypothesis). Methods: 40 volunteers received a recognition task in which the meaningful two-character Chinese words were used. The subjects had to discriminate between studied words, highly familiar lures and new words. The ERP correlates of recognition memory were recorded from 16 scalp sites of the extended 10-20 systems. Results: The present results are consistent with the hypothesis: N300 differentiated new from similar and studied items (correct rejections < false alarms to lures =hits), whereas the parietal old/new effect was greater for correctly recognized words than falsely recognized similar lures (hits >false alarms to lures=correct rejections). However, the frontal old/new effects of Chinese words demonstrated a negative shift. Conclusion: The ERPs to Chinese words recognition also demonstrated significant frontal old/new effect and the parietal old/new effect. Moreover, the frontal old/new effect varies with stimulus familiarity, while the parietal old/new effect varies with recollection. In addition, we assume that the negative-going frontal old/new effect might be affected by the language and material.