Woodward S H, Owens J, Thompson L W
Department of Medicine, Stanford University Medical School, CA.
Brain Lang. 1990 May;38(4):488-503. doi: 10.1016/0093-934x(90)90133-2.
Data were collected shedding light on the brain electrical activity underlying word recognition. Subjects listened to a list of 48 spoken words in six random orders under two instructional sets: first to "think about the meanings of the words," and second, to learn the list. The scalp EEG associated with hearing and identifying the words was recorded at F3, F4, Cz, P3, P4, Pz, and Oz. Standard within-subjects time-locked averaging across words showed a late negative-positive complex with N2-P3 topography, the negative component peaking around 480 msec, the positive component peaking around 830 msec. Averaging within words across subjects uncovered considerable latency variability in both components. Within-word N2 and P3 component latencies covaried with word durations and with the "recognition points" predicted for the words by the "cohort theory" of word recognition. N2 latencies corresponded closely to the "N400" effect elicited with semantically incongruous sentence-final spoken words. Implications for ERP investigations of language processing are discussed.
收集的数据揭示了单词识别背后的大脑电活动。受试者在两种指导语条件下，以六种随机顺序听了48个口语单词列表：第一种是“思考单词的含义”，第二种是学习该列表。在F3、F4、Cz、P3、P4、Pz和Oz记录与听到和识别单词相关的头皮脑电图。对单词进行标准的受试者内时间锁定平均，显示出具有N2 - P3地形的晚期负 - 正复合波，负成分在约480毫秒达到峰值，正成分在约830毫秒达到峰值。对受试者之间的单词进行平均，发现两个成分的潜伏期都存在相当大的变异性。单词内的N2和P3成分潜伏期与单词持续时间以及单词识别的“群组理论”预测的单词“识别点”相关。N2潜伏期与语义不一致的句末口语单词引发的“N400”效应密切相关。讨论了对语言处理的事件相关电位研究的影响。
