ISSN 0439-755X
CN 11-1911/B
主办:中国心理学会
   中国科学院心理研究所
出版:科学出版社

心理学报 ›› 1997, Vol. 29 ›› Issue (2): 195-201.

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跨感觉通路ERP注意成分的研究

罗跃嘉;魏景汉   

  1. 中国科学院心理研究所
  • 出版日期:1997-06-25 发布日期:1997-06-25
  • 通讯作者: 罗跃嘉

CROSS-MODAL RESEARCH ON ATTENTION COMPONENTSOF EVENT-RELATED POTENTIALS

Luo Yuejia Wei Jinghan (Institute of Psychology ,Chinese Academy of Sciences ,Beijing, 100012)   

  • Published:1997-06-25 Online:1997-06-25

摘要: 采用提高了非注意纯度的“跨通路延迟反应”实验模式,研究跨通路注意的事件相关电位(ERP)成分,以注意ERP减去非注意ERP的早期差异负波(Nd1)为主要分析对象。被试者为12名青年正常人。结果发现:①听觉偏差刺激、视觉标准与偏差刺激皆在其特异性感觉区域的头皮部位,观察到注意引起N1波幅增大的现象。Nd1的起始时间与注意N1相同,而早于非注意N1,支持注意的早期选择学说;②听觉与视觉偏差刺激产生的Nd1最大峰分布在它们各自的初级感觉投射区,而标准刺激诱发的Nd1最大峰却分布于额部,表明跨通路选择性注意对偏差刺激的加工部位主要是通路特异性的,而对标准刺激的加工部位则主要是通路上的。作者据此针对选择性注意中长期争论问题进一步提出,注意的选择性发生时程的早晚可因刺激条件而异,信息过滤器的位置具有可塑性。

关键词: 事件相关电位(ERP), 差异负波(Nd), 加工负波(PN), 选择性注意, 跨通路延迟反应模式

Abstract: Event - related potentials were measured on 1 2 normal youth subjects aged 20 - 22 using paradigm " Cross - modal and delayed response" which can improve inattention purity and avoid the effect of task target on the deviant components of ERP.The experi- ment included two conditions: Attend visual modality , ignore auditory modality: At- tend auditory modality , ignore visual modality. The stimulation presented to every subject was the series of five kinds of stimuli, standard, deviant stimuli and response imperative signal in attended modality: standard and deviant stimuli in unattended modality. The vi- sual and auditory sdmuli occurred with a pseudo - random order. The presentation probability of standard stimuli was 82.5 % and deviant stimuli was 1 7. 5 % Every standard or deviant stimulus followed a response imperative signal in attended modality. Different waves were obtained respectively by subtracting ERPs of the standard and deviant sdmuli in unattended condition from those of the same standard and deviant stimuli in attended condition. The present results showed, Under attended condition, there was anenhancement of N1 elicited by deviant stimuli in auditory ,and standard and deviant in visual modality at their own primary sensory area The evidence supported early selection the- ory of attention being provided by the N1 and Nd1 topography, which showed that the Nd 1 onset was earlier than N1 onset in unattended condition rather than that in attended condition. The Nd1 elicited by auditory and visual deviant stimuli were distributed respectively over their primary sensory areas, but Nd1 evoked by auditory and visualstandard stimuli over frontal scalp This result suggested that the processing location of cross-modal attention to deviant stimuli was modality-specificity and to standard stimuli was supramodal mechanism. With regard to the lasting debated problem about selective at - tention, the author suggested that early and late-selection probably changed as a result of various conditions. This means that the early and late - selection of attention has plasticity

Key words: Event-related potentials (ERPs), Negative difference (Nd), Processing Negativity (PN), Selective attention, Cross-modal and delayed response paradigm