Lew G S, Polich J
University of California, San Diego 92037.
Physiol Behav. 1993 Jan;53(1):111-7. doi: 10.1016/0031-9384(93)90018-b.
The P3(00) event-related brain potential (ERP) was elicited with an auditory discrimination paradigm under two response task conditions in which the probability of the target tone was always 0.20. Subjects either counted the occurrence of each target tone or pressed a button to the target in different conditions. No response was made to the standard tone. Consecutive blocks of trials were obtained to assess habituation of P3 amplitude. The count task demonstrated less habituation than the button-press task, with a strong interaction obtained between response mode and trial block for all electrode sites. The findings suggest that habituation of P3 amplitude is sensitive to the amount of attentional resources allocated to the processing of a target stimulus, with more resources required for a count task compared to fewer needed for a button-press response.
在两种反应任务条件下，采用听觉辨别范式诱发P3（00）事件相关脑电位（ERP），其中目标音的概率始终为0.20。在不同条件下，受试者要么对每个目标音的出现进行计数，要么对目标按下按钮。对标准音不做反应。获取连续的试验块以评估P3波幅的习惯化。计数任务显示出比按键任务更少的习惯化，所有电极部位的反应模式和试验块之间存在强烈的交互作用。研究结果表明，P3波幅的习惯化对分配给目标刺激处理的注意力资源量敏感，与按键反应相比，计数任务需要更多资源。
