TASK-DIFFICULTY, PROBABILITY, AND INTER-STIMULUS INTERVAL AS DETERMINANTS OF P300 FROM AUDITORY-STIMULI
TASK-DIFFICULTY, PROBABILITY, AND INTER-STIMULUS INTERVAL AS DETERMINANTS OF P300 FROM AUDITORY-STIMULI
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DOI：
10.1016/0168-5597(87)90052-9
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发表时间：
1987-07-01
期刊：
影响因子：
--
通讯作者：
POLICH, J
中科院分区：
文献类型：
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作者：
POLICH, J
在4个实验中，通过听觉刺激引发P300事件相关电位，这些实验操纵刺激目标概率（10%与30%）、任务难度（简单与困难）和刺激间间隔（5秒与2秒）的组合。P300振幅较小，峰潜伏期较长的更困难的相对较容易的任务在整个实验。刺激靶概率的增加一般会降低P300振幅和缩短峰潜伏期更容易相对于困难的任务条件。增加非靶刺激音的数量可靠地降低P300振幅，但仅略微增加潜伏期。任务难度并没有相互作用的变化，刺激间的间隔，产生普遍弱的影响幅度和潜伏期。这些研究结果表明，P300振幅和潜伏期从听觉歧视范式反映独立的刺激目标概率的处理困难，除非在任务要求的差异影响刺激编码。
The P300 event-related potential was elicited with auditory stimuli in 4 experiments which manipulated combinations of stimulus target probability (10% vs. 30%), task difficulty (easy vs. hard), and inter-stimulus interval (5 sec vs. 2 sec). P300 amplitude was smaller and peak latency longer for the more difficult relative to the easier tasks across experiments. Increases in stimulus target probability generally diminished P300 amplitude and shortened peak latency more for the easy relative to difficult task conditions. Increasing the number of non-target stimulus tones decreased P300 amplitude reliably, but increased latency only slightly. Task difficulty did not interact with variations in inter-stimulus interval which produced generally weak effects for both amplitude and latency. These findings suggest that P300 amplitude and latency obtained from auditory discrimination paradigms reflect processing difficulty independently of stimulus target probability unless differences in task requirements affect stimulus encoding.