The old switcheroo: when target environmental sounds elicit a novelty P3
The old switcheroo: when target environmental sounds elicit a novelty P3
复制标题
DOI：
10.1016/j.clinph.2004.01.008
复制
发表时间：
2004-06-01
影响因子：
4.7
通讯作者：
Friedman, D
中科院分区：
文献类型：
--
作者：
Cycowicz, YM;Friedman, D
目的：新颖的环境声音是任务无关的新奇古怪的范式引起的新奇P3或P3a的额中央头皮分布，而纯音任务相关的刺激引起的P3与后方地形（P3b）。要确定是否刺激性质或其功能的任务调制头皮地形，两种类型的刺激过程中的新奇oddball task.Methods的作用被逆转：脑电活动记录，而12个年轻人听频繁的音调，不频繁的音调，和不频繁的环境声音。受试者不被告知的不频繁的音调，但被指示按下反应时间（RT）按钮时，他们听到的不频繁的环境sounds.Results：尽管“新奇”的性质的音调，他们与后头皮分布典型的P3B。同样，尽管环境声音的“目标”性质，它们与典型的P3a.Conclusions额中央头皮地形相关：这些数据表明，新奇P3的引出不仅取决于任务要求，而且还取决于刺激的物理性质。大脑的定向反应受到情境环境和诱发刺激的物理特性的调节。(C)2004年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Novel environmental sounds that are task-irrelevant in the novelty oddball paradigm elicit the novelty P3 or P3a with a fronto-central scalp distribution, while pure tone task-relevant stimuli elicit a P3 with a posterior topography (P3b). To determine whether stimulus nature or its function in the task modulates scalp topography, the role of the two types of stimuli during the novelty oddball task was reversed.Methods: Brain electrical activity was recorded while 12 young adults listened to frequent tones, infrequent tones, and infrequent environmental sounds. Subjects were not informed about the infrequent tones, but were instructed to press a reaction time (RT) button when they heard the infrequent environmental sounds.Results: Despite the 'novelty' nature of the tones, they were associated with a posterior scalp distribution typical of the P3b. Similarly, despite the 'target' nature of the environmental sounds, they were associated with a fronto-central scalp topography typical of the P3a.Conclusions: These data suggest that the elicitation of a novelty P3 depends not only on task demands but also on the physical nature of the stimulus.Significance: The brain's orienting response is modulated by the contextual environment as well as the physical properties of the eliciting stimulus. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.