Meditation (Vipassana) and the P3a event-related brain potential.
Meditation (Vipassana) and the P3a event-related brain potential.
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DOI：
10.1016/j.ijpsycho.2008.03.013
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发表时间：
2009-04
影响因子：
3
通讯作者：
Polich, John
中科院分区：
文献类型：
--
作者：
Cahn, B. Rael;Polich, John
关键词：
在冥想和控制思维期间，向经验丰富的内观禅修者呈现了三刺激听觉奇怪系列，以在两种不同的精神状态下引发事件相关的大脑电位（ERP）。刺激包括频繁的标准音调（500 Hz）、不常见的奇怪音调（1000 Hz）和不常见的干扰物（白噪声），所有刺激都是通过耳机被动呈现的，没有强加任何任务。与控制状态效果相比，最强的冥想发生在分散注意力的刺激上：来自分散注意力的 N1 振幅在冥想期间正面减小；冥想期间，来自干扰物和奇怪刺激的 P2 幅度有所降低；冥想期间，来自干扰物的 P3a 幅度降低。冥想引起的 P3a 振幅降低在每日冥想练习时间较长的参与者中最为明显，而在实验冥想过程中报告困倦的参与者中则不明显。研究结果表明，冥想状态可以降低神经生理过程的幅度，从而促进意外和分散注意力的刺激引起的注意力集中。与内观冥想减少认知和情绪反应性的目的一致，减少 P3a 振幅对分散注意力的刺激的状态影响反映了与任务无关的需要注意的刺激的自动反应性和评估处理的减少。
A three-stimulus auditory oddball series was presented to experienced Vipassana meditators during meditation and a control thought period to elicit event-related brain potentials (ERPs) in the two different mental states. The stimuli consisted of a frequent standard tone (500 Hz), an infrequent oddball tone (1000 Hz), and an infrequent distracter (white noise), with all stimuli passively presented through headphones and no task imposed. The strongest meditation compared to control state effects occurred for the distracter stimuli: N1 amplitude from the distracter was reduced frontally during meditation; P2 amplitude from both the distracter and oddball stimuli were somewhat reduced during meditation; P3a amplitude from the distracter was reduced during meditation. The meditation-induced reduction in P3a amplitude was strongest in participants reporting more hours of daily meditation practice and was not evident in participants reporting drowsiness during their experimental meditative session. The findings suggest that meditation state can decrease the amplitude of neurophysiologic processes that subserve attentional engagement elicited by unexpected and distracting stimuli. Consistent with the aim of Vipassana meditation to reduce cognitive and emotional reactivity, the state effect of reduced P3a amplitude to distracting stimuli reflects decreased automated reactivity and evaluative processing of task irrelevant attention-demanding stimuli.
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