Biased odds for heads or tails: Outcome-evoked P3 depends on frequencies of guesses.
Biased odds for heads or tails: Outcome-evoked P3 depends on frequencies of guesses.
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DOI：
10.1111/psyp.12440
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发表时间：
2015-08
期刊：
影响因子：
3.7
通讯作者：
R. Verleger;Dariusz Asanowicz;Lucas Werner;K. Śmigasiewicz
中科院分区：
文献类型：
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作者：
R. Verleger;Dariusz Asanowicz;Lucas Werner;K. Śmigasiewicz
必须预测的事件引起事件相关EEG电位的大P3分量。有相互矛盾的证据表明，这些P3是否被参与者先前的猜测所调节。在本研究中，参与者经常做出一种预测，而很少做出另一种预测，因为一种刺激经常出现而另一种很少出现。因此，猜测频率和刺激频率对刺激诱发的P3的影响可以被测试。事实上，P3不仅在罕见刺激比频繁刺激时更大，而且在罕见猜测比频繁猜测后也更大。这种结果模式可能还受到预期回报的影响。在任何情况下，结果诱发的P3被猜测的内容修改可能反映出四种猜测-刺激组合中的每一种都被编码为单独的事件类别。根据P3 b的刺激-反应联系假说，我们认为P3 s是由这些事件引起的，因为内部反应（对或错）与这些事件类别中的每一个相关联，并且需要用罕见的猜测-刺激组合来重新激活。
Events that had to be predicted evoke large P3 components of the event-related EEG potential. There is conflicting evidence whether these P3s are moderated by participants' preceding guesses. In the present study, participants made one prediction frequently and the other rarely because one stimulus was presented frequently and the other rarely. Thereby, effects on stimulus-evoked P3s of both guess frequency and stimulus frequency could be tested. Indeed, P3s were not only larger with rare than frequent stimuli but also larger after rare than frequent guesses. This result pattern may have additionally been affected by expectancies for payoff. In any case, the modification of outcome-evoked P3 by what had been guessed may reflect that each of the four guess-stimulus combinations is encoded as a separate event category. In terms of the stimulus-response link hypothesis of P3b, it is suggested that P3s are evoked by these events because internal responses (right or wrong) are associated to each of these event categories and need to be reactivated with rare guess-stimulus combinations.