Stamm J S, Whipple S C, Born J
Int J Psychophysiol. 1987 May;5(1):11-8. doi: 10.1016/0167-8760(87)90067-5.
Adult subjects were tested on a choice reaction time (RT) task for decisions of word pairs as synonyms or unrelated. For each trial the word stimuli were presented contingent upon computer-detection of a predetermined negative or positive EEG baseline shift, recorded from either parietal or frontal midline electrodes. With parietal slow potential (SP) shifts, RTs were significantly faster and less variable under negative than positive polarity conditions. No appreciable RT differences were found between negative and positive SP shifts from frontal electrodes or for control subjects. The parietal negative SP shifts are considered to reflect enhanced semantic processing. The present findings in combination with previous results (Born et al., 1982, Electroencephalogr. Clin. Neurophysiol., 54: 668-676) demonstrate a double dissociation between the functional properties of negative SP shifts from parietal and frontal cortical areas, with respective involvements in semantic processing and response selection and execution.
成年受试者接受了一项选择反应时（RT）任务测试，任务内容是判断单词对是同义词还是无关词。在每次试验中，单词刺激的呈现取决于计算机检测到的预定负性或正性脑电图基线偏移，这些偏移是从顶叶或额叶中线电极记录的。在顶叶慢电位（SP）偏移的情况下，负极性条件下的反应时明显比正极性条件下更快且变异性更小。对于额叶电极的负性和正性SP偏移，或者对于对照受试者，未发现明显的反应时差异。顶叶负性SP偏移被认为反映了语义加工的增强。本研究结果与先前的结果（Born等人，1982年，《脑电图学与临床神经生理学》，54: 668 - 676）相结合，证明了顶叶和额叶皮质区域负性SP偏移的功能特性之间存在双重分离，它们分别参与语义加工以及反应选择和执行。
