Making decisions about time: Event-related potentials and judgements about the equality of durations
Making decisions about time: Event-related potentials and judgements about the equality of durations
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DOI：
10.1016/j.biopsycho.2011.06.013
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发表时间：
2011-09-01
影响因子：
2.6
通讯作者：
Rebai, Mohamed
中科院分区：
文献类型：
--
作者：
Paul, Isabelle;Wearden, John;Rebai, Mohamed
参与者被暴露在一个时间的概括任务，一个小的视觉刺激的持续时间进行判断。受试者接受600毫秒的标准持续时间，然后必须判断其他持续时间（长于、短于或等于标准）是否是标准（做出是或否的回答）。在不同的实验条件下，非标准持续时间与标准持续时间的间隔分别为150 ms（简单条件）和75 ms（困难条件），因此这两种条件涉及对相同刺激（450，600和750 ms）的一些判断。因此，当判断的基础相同时，该实验比较了对相同物理刺激的判断，从而避免了早期关于时间判断的电生理学研究中存在的一些控制问题。在以前的工作中，较少的是的反应发生在困难的条件和450毫秒的持续时间是600毫秒的标准比750毫秒的混淆。计算机模拟表明，这（"是"的答复减少）是由于"是"判断的决定阈值降低。电生理学结果表明，容易和困难的条件之间的区别，可观察到的LCPt（晚阳性成分的定时）的变化后，测量的刺激介绍和P1的变化。CNV（Contingent Negative Variation）和其在刺激呈现期间的正对应物，当辨别困难时，CNV更大。因此，我们的研究结果表明，增加概括任务的难度不仅改变了决策过程，而且也改变了注意机制。他们还表明，该决定似乎并不涉及一个单一的机制，但取决于一组子过程，特别是注意机制，这是从刺激呈现的时刻改变。(C)2011 Elsevier B.V.保留所有权利。
Participants were exposed to a temporal generalization task where the duration of a small visual stimulus was judged. People received a 600 ms standard duration, then had to judge whether other durations (longer than, shorter than, or equal to the standard) were or were not the standard (making a YES or NO response). In different experimental conditions, the spacing of non-standard durations around the standard was 150 ms (Easy condition), or 75 ms (Difficult condition), so the two conditions involved some judgements made with the same stimuli (450, 600, and 750 ms). The experiment thus compared judgements of the same physical stimuli, when the basis of the judgement was the same, thus avoiding some problems of control that have been present in earlier electrophysiological studies of time judgements. As in previous work, fewer YES responses occurred in the Difficult condition and the 450 ms duration was less confused with the 600 ms standard than the 750 ms one was. Computer modelling suggested that this (fewer YES responses) was due to a decrease in the decision threshold for the YES judgement. The electrophysiological results showed a distinction between the Easy and Difficult conditions observable by a change in the LCPt (Late Positive Component of Timing) measured after the stimulus presentations and by a change in the P1. the CNV (Contingent Negative Variation), and its positive counterpart during the presentation of the stimulus, which were larger when the discrimination was difficult. Our results therefore suggest that the increase in the difficulty of the generalization task not only changes decision processes but also alters attentional mechanisms. They also reveal that the decision does not seem to involve a unitary mechanism but depends on a group of sub-processes, notably attentional mechanisms which are altered from the moment of presentation of the stimulus. (C) 2011 Elsevier B.V. All rights reserved.