Three Stages and Four Neural Systems in Time Estimation
Three Stages and Four Neural Systems in Time Estimation
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DOI：
10.1523/jneurosci.3222-09.2009
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发表时间：
2009-11-25
影响因子：
5.3
通讯作者：
Giraud, Anne-Lise
中科院分区：
文献类型：
--
作者：
Morillon, Benjamin;Kell, Christian A.;Giraud, Anne-Lise
吉本的标量期望理论假设时间估计的三个处理阶段：自动跟踪事件持续时间的整理级别、读出时间跟踪系统的计数级别以及将事件持续时间与抽象时间参考相匹配的比较级别。然而，Poppel 的理论假设了一个双系统来感知低于和高于 2 秒的持续时间。通过使用功能磁共振成像测试吉本提议的神经生理学合理性，我们验证了时间估计的三阶段模型，并进一步表明整理过程是重复的。尽管运动系统会自动跟踪低于 2 秒的持续时间，但所谓的“默认模式网络”的大脑中部区域会跟踪较长的事件。我们的结果进一步支持独特的计数和比较系统，涉及整理者读数中的前额叶和顶叶皮层，以及上下文时间估计中的颞叶皮层。这些发现为两种时间感知理论提供了一个连贯的神经解剖学框架。
Gibbon's scalar expectancy theory assumes three processing stages in time estimation: a collating level in which event durations are automatically tracked, a counting level that reads out the time-tracking system, and a comparing level in which event durations are matched to abstract temporal references. Poppel's theory, however, postulates a dual system for perception of durations below and above 2 s. By testing the neurophysiological plausibility of Gibbon's proposal using functional magnetic resonance imaging, we validate a three-staged model of time estimation and further show that the collating process is duplicated. Although the motor system automatically tracks durations below 2 s, mesial brain regions of the so-called "default mode network" keep track of longer events. Our results further support unique counting and comparing systems, involving prefrontal and parietal cortices in collators' readout, and the temporal cortex in contextual time estimation. These findings provide a coherent neuroanatomical framework for two theories of time perception.