THE ANALYSIS OF STIMULUS PROBABILITY INSIDE AND OUTSIDE THE FOCUS OF ATTENTION, AS REFLECTED BY THE AUDITORY N-1 AND P-3 COMPONENTS
THE ANALYSIS OF STIMULUS PROBABILITY INSIDE AND OUTSIDE THE FOCUS OF ATTENTION, AS REFLECTED BY THE AUDITORY N-1 AND P-3 COMPONENTS
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DOI：
10.1037/h0081153
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发表时间：
1981-01-01
期刊：
影响因子：
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通讯作者：
LITTLE, R
中科院分区：
文献类型：
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作者：
DONALD, MW;LITTLE, R
受试者（12）进行选择性的2通道听觉频率辨别，同时在关注和拒绝通道中同时平均他们的诱发反应。目标音调相对于标准音调的概率被设置为1/4、1/8或1/16。目标检测率和猜测率采用最大似然估计技术建模。听觉N1分量被抑制的所有刺激中拒绝的通道在所有级别的概率，抑制是最大的目标刺激时，是最有可能的。尽管这种抑制，拒绝的通道响应减少刺激的概率与N1增强。P3振幅线性增加的目标是罕见的，但只在出席的通道，拒绝通道没有响应罕见的音调的概率的变化。当目标是最频繁的（1在4）P3振幅在出席的通道下降到相同的水平P3在拒绝的通道，尽管最大的N1选择性和足够的性能的任务。选择性注意是选择性P3反应的必要条件，但不是充分条件。显然，在产生N1之前，基于位置和音高选择性地修改了关注输入，并且在该水平的注意力焦点内部和外部处理了关于刺激概率的一些信息。结果与P3点不同的概率敏感的机制，其运作是视乎重点关注。
Subjects (12) performed a selective 2-channel auditory frequency discrimination while their evoked responses were averaged concurrently in both the attended and rejected channels. The probability of a target tone relative to a standard tone was set at either 1 in 4, 1 in 8, or 1 in 16. Target detection and guessing rates were modeled with the maximum likelihood estimation technique. The auditory N1 component was suppressed for all stimuli in the rejected channel at all levels of probability, the suppression being greatest when target stimuli were most probable. Despite this suppression, the rejected channel responded to reduced stimulus probability with N1 augmentation. P3 amplitude increased linearly as targets were made rarer, but only in the attended channel; the rejected channel did not respond to changes in the probability of rare tones. When targets were most frequent (1 in 4) P3 amplitude in the attended channel dropped to the same level as P3 in the rejected channel, despite maximal N1 selectivity and adequate performance of the task. Selective attention is a necessary, but not sufficient condition for a selective P3 response. Apparently, attended inputs are modified selectively on the basis of location and pitch prior to the generation of N1, and also some information about stimulus probability is processed both inside and outside the focus of attention at this level. The results with respect to P3 point to a different probability-sensitive mechanism whose operation is contingent upon focal attention.