Journal of Cognitive Neuroscience 11:3
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چکیده
n This paper presents evidence of the disputed existence of an electrophysiological marker for the lexical-categorical distinction between openand closed-class words. Event-related brain potentials were recorded from the scalp while subjects read a story. Separate waveforms were computed for openand closed-class words. Two aspects of the waveforms could be reliably related to vocabulary class. The arst was an early negativity in the 230to 350-msec epoch, with a bilateral anterior predominance. This negativity was elicited by openand closedclass words alike, was not affected by word frequency or word length, and had an earlier peak latency for closed-class words. The second was a frontal slow negative shift in the 350to 500-msec epoch, largest over the left side of the scalp. This late negativity was only elicited by closed-class words. Although the early negativity cannot serve as a qualitative marker of the openand closed-class distinction, it does reoect the earliest electrophysiological manifestation of the availability of categorical information from the mental lexicon. These results suggest that the brain honors the distinction between openand closed-class words, in relation to the different roles that they play in on-line sentence processing. ■
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تاریخ انتشار 1999