EFFECTS OF RARE NONTARGET STIMULI ON BRAIN ELECTROPHYSIOLOGICAL ACTIVITY AND PERFORMANCE
EFFECTS OF RARE NONTARGET STIMULI ON BRAIN ELECTROPHYSIOLOGICAL ACTIVITY AND PERFORMANCE
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DOI：
10.1016/0167-8760(90)90058-l
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发表时间：
1990-10-01
影响因子：
3
通讯作者：
BRAFF, D
中科院分区：
文献类型：
--
作者：
GRILLON, C;COURCHESNE, E;BRAFF, D
为了评估非目标刺激对任务表现和电生理活动的影响，16名被试在3种条件下进行了反应时间（RT）实验。在所有条件下，受试者必须在检测到频率（85%）非目标刺激中出现的罕见（15%）目标刺激（1600 Hz）时按下按钮。这三种情况的不同是基于他们的非目标刺激。在一种情况下，非目标由“标准”刺激（900赫兹）组成。在另外两种情况下，在标准刺激中随机加入罕见和异常的非目标刺激。这些偏离目标的非目标刺激包括恒定的（700赫兹的音调）或新奇的（蜂鸣声、过滤噪音和其他不寻常的声音）刺激。罕见的目标刺激和非目标刺激均引起P300，反应。行为（RT）和电生理（事件相关电位）数据显示，标准刺激后的刺激处理与偏离非目标刺激后的刺激处理不同。在存在偏差非目标刺激条件下，P3b对目标刺激的反应时间比无偏差刺激条件下更短、更晚，平均RT时间更长。从注意力分散和任务难度增加两个因素探讨了异常非目标刺激引起的行为和电生理变化。这表明，这些因素中的每一个对速率偏差刺激的新颖性都有不同的敏感性。
In order to assess the effects of non-target stimuli on task performance and electrophysiological activity, 16 subjects performed reaction time (RT) experiments under 3 conditions. In all conditions, subjects had to press a button upon detection of rare (15%) target stimuli (1600 Hz) presented among frequent (85%) non-target stimuli. The 3 conditions differed based on their non-target stimuli. In one condition, the non-targets consisted of ''standard'' stimuli (900 Hz). In the two other conditions, rare and deviant non-target stimuli were randomly added to the standard stimuli. These deviant non-target stimuli consisted of either constant (700-Hz tones) or novel (buzzes, filtered noises and other unusual sounds) stimuli. Both the rare target and non-target stimuli elicited P300, responses. Behavioral (RT) and electrophysiological (event-related potential) data showed that stimuli that followed standard stimuli were processed differently compared to stimuli that followed deviant non-target stimuli. In the conditions containing deviant non-target stimuli, the P3b to the target stimuli was smaller and later, and the mean RT longer than in the condition with no deviant stimuli. These behavioral and electrophysiological changes induced by the deviant non-target stimuli were discussed with reference to two factors, distraction and increased level of task difficulty. It was suggested that each of these factors were differentially sensitive to the novelty of the rate deviant stimuli.