Primary task demands modulate P3a amplitude
Primary task demands modulate P3a amplitude
复制标题
DOI：
10.1016/s0926-6410(99)00044-0
复制
发表时间：
2000-01-01
期刊：
影响因子：
--
通讯作者：
Reyes, A
中科院分区：
文献类型：
--
作者：
Harmony, T;Bernal, J;Reyes, A
记录了 10 名受试者在两种不同条件下的听觉事件相关脑电位 (ERP)：(1) 受试者需要重新排列五个视觉呈现的字母，以形成单词并提供口头响应（任务条件）； (2) 向受试者提供与实验刺激具有相同物理特征的控制刺激，但仅包含一种类型的字母（即 AAAAA）。受试者必须通过说“A”（控制条件）来对此类刺激进行口头反应。 1000 Hz（标准）和 1050 Hz（异常）的音调也在视觉刺激呈现之前 2 秒、期间和之后 8 秒以 85%-15% 概率范例呈现给受试者。录音是从 Fpz、Fz、Ct 和 Pt 与连接的耳朵中获得的。在呈现视觉字母串之后以及执行任务期间，对两种条件下的标准音调和异常音调的听觉刺激的听觉 ERP 进行平均。仅考虑正确答案作为平均值。 N100 受刺激类型（标准与异常）影响，但不受条件（任务与控制）影响；然而，在控制期间观察到的 P3a 波比在任务条件下更大。在失配负性 (MMN) 潜伏期范围内，未观察到条件之间存在显着差异。这些结果表明主要任务要求调节非自愿注意处理。 (C) 2000 Elsevier Science B.V. 保留所有权利。
Auditory event-related brain potentials (ERPs) were recorded from 10 subjects in two different conditions: (1) subjects were required to reorder five visually presented letters in order to form a word and provide a verbal response (task condition); (2) subjects were presented with a control stimulus with the same physical characteristics as the experimental stimulus, but containing just one type of letter (i.e., AAAAA). Subjects had to verbally respond to such stimuli by saying "A" (control condition). Tones of 1000 Hz (standard) and 1050 Hz (deviant) were also presented to the subjects in a 85%-15% probability paradigm 2 s before, during and 8 s after the presentation of the visual stimuli. Recordings were obtained from Fpz, Fz, Ct and Pt vs. Linked ears. Auditory ERPs to the auditory stimuli after the presentation of the visual letter string and during the performance of the task were averaged for the standard and deviant tones in both conditions. Only correct responses were considered for the averages. The N100 was affected by stimulus type (standard vs. deviant) but not by condition (task vs, control); however, larger P3a waves were observed during the control than during the task condition. No significant differences between conditions were observed in the mismatch negativity (MMN) latency range. These results suggest that primary task demands modulate involuntary attention processing. (C) 2000 Elsevier Science B.V. All rights reserved.