Discontinuous presentation of ambiguous figures: How interstimulus-interval durations affect reversal dynamics and ERPs
Discontinuous presentation of ambiguous figures: How interstimulus-interval durations affect reversal dynamics and ERPs
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DOI：
10.1111/j.1469-8986.2007.00525.x
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发表时间：
2007-07-01
期刊：
影响因子：
3.7
通讯作者：
Bach, Michael
中科院分区：
文献类型：
--
作者：
Kornmeier, Juergen;Ehm, Werner;Bach, Michael
如果我们观察到一个模糊的图形，我们的感知是不稳定的，并在可能的解释之间交替。周期性地中断呈现可大大调节自发反转速率。我们在这里研究了事件相关电位（ERP）相关的神经过程背后的这些强调节。当被试表现知觉逆转时，模糊的Necker刺激以4个随机间隔（ISI; 14、43、130、390 ms）不连续呈现。脑电图对参与者的感知和ISI进行选择性平均。不同ISIs之间的ERP痕迹差异显著。一个简单的模型解释了这种变化的主要部分，并表明依赖于isi的ERP调制发生在消歧义之后。我们认为感知稳定性（或反转）取决于系统状态，从一个反转到下一个反转缓慢变化。ISI可以在稳定和不稳定之间转换这种状态。
If we observe an ambiguous figure, our percept is unstable and alternates between the possible interpretations. Periodically interrupting the presentation sizably modulates the spontaneous reversal rate. We here studied event-related potential (ERP) correlates of the neural processes underlying these strong modulations. An ambiguous Necker stimulus was presented discontinuously with four randomly varying interstimulus intervals (ISI; 14, 43, 130, 390 ms) while participants indicated perceptual reversals. EEG was selectively averaged with respect to the participants' percept and ISI. ERP traces varied markedly between ISIs. A simple model explained a major part of this variation and showed that the ISI-dependent ERP modulation occurs after disambiguation has already taken place. We suggest that perceptual stability (or reversal) depends on a system state, slowly changing from one reversal to the next. ISI can shift this state on a scale between stability and instability.