title: [N2 effect on non-target event-related brain potentials during auditory selective response task].
abstract: Objective. To study N2 effect and its feature on non-target event-related brain potentials during auditory selective attention. Method. The subjects were 16 healthy right-handed male volunteers aged 23.2 +/- 2.1 years. The stimuli were male voice of one-digit numbers (2 to 7), which were single syllable pronunciated in Chinese, and appeared randomly with equal probability. The subjects were asked to press a switch as soon as the target signal (odd or even number) was heard but make no response to the non-target signal. EEG signals at 9 locations were recorded. Result. 1) A negative component N280 (N2 effect) was found after non-target stimuli as compared to target stimuli, which was significant in the frontal brain locations; 2) P3 was smaller and its peak appeared later in non-target ERPs than in target ERPs. Conclusion. N2 effect was also elicited by non-target stimuli during auditory modality. We assume that N2 effect might reflect the readjusting of model stored in working memory at the frontal brain.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China. lunzhao@263.net
authors.forename: Lun
authors.initials: L
authors.lastname: Zhao
authors.forename: Jin-he
authors.initials: JH
authors.lastname: Wei
authors.forename: Fei-zhou
authors.initials: FZ
authors.lastname: Tong
mesh_terms: D000328:Adult; D001288:Attention / Q000187:drug effects*; D004569:Electroencephalography; D006804:Ergonomics; D005072:Evoked Potentials, Auditory / Q000187:drug effects*; D006801:Humans; D008297:Male; D008568:Memory / Q000187:drug effects*; D009584:Nitrogen / Q000494:pharmacology*; D011930:Reaction Time / Q000187:drug effects*
chemical_list: D009584:Nitrogen