Subliminal visual oddball stimuli evoke a P300 component
Subliminal visual oddball stimuli evoke a P300 component
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DOI：
10.1016/s1388-2457(00)00445-4
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发表时间：
2001-01-01
影响因子：
4.7
通讯作者：
Snodgrass, M
中科院分区：
文献类型：
--
作者：
Bernat, E;Shevrin, H;Snodgrass, M
目的：在一种奇怪的范式中，提供阈值下刺激可诱发P300成分的证据。方法：左右词语以一种频繁-罕见的比例(80%-20%)呈现，并在被试之间平衡。结果：使用较宽的200-900ms窗口(F(1，27)=5.75，P<；0.012，(2)=0.18；单尾)和较窄的400-760ms窗口(F(1，27)=10.10，P<；(2)=0.18；单尾)，在电极Fz、Cz和Pz上发现罕见的和频繁的刺激呈现的幅度分量明显更大。0.002，(2)=0.27；单尾)。未发现显著的成分潜伏期效应。对意识知觉指数(d‘)和奇特效应(罕见-频繁幅度差)的分析发现两者之间存在负相关关系，进一步支持了有意识知觉不能解释这一发现的观点，并表明任何有意识的刺激检测都可能抑制这种潜意识效应。结论：结果提供了证据，证明在奇怪的范式中，不可检测的潜伏期刺激可以诱发内源性成分。通过比较有意识和无意识的信息处理，无意识的学习，以及潜意识刺激的事件相关电位的测量，讨论了其含义。(C)2001爱思唯尔爱尔兰科学有限公司。保留所有权利。
Objective: To provide evidence that a P300 component can be elicited by subliminal stimuli in an oddball paradigm.Methods: The words LEFT and RIGHT were presented in a frequent-rare ratio (80-20%), counterbalanced between subjects. Stimuli were presented at the objective detection threshold (d' = 0, via unmasked 1 ms presentations), a stringent measure for detecting any conscious perception.Results: A significantly larger amplitude component was found for rare vs. frequent stimulus presentations across electrodes Fz, Cz, and Pz using both a broad 200-900 ms window (F(1,27) = 5.75, P < 0.012, (2) = 0.18; one-tailed), and a more narrow 400-760 ms window defined using principal component analysis (F(1, 27) = 10.10, P < 0.002, (2) = 0.27; one-tailed). No significant component latency effect were found. An analysis of the conscious perception index (d') and the oddball effect (rare-frequent amplitude difference) revealed a negative relationship, further supporting the contention that conscious perception does not account for the finding, and suggesting that any conscious stimulus detection may inhibit this subliminal effect.Conclusions: Results provide evidence that an endogenous component can be elicited by undetectable subliminal stimuli in an oddball paradigm. Implications are discussed fur comparing conscious and unconscious information processing, unconscious learning, and the measurement of ERPs to subliminal stimuli. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.