Time representations can be made from nontemporal information in the brain: An MEG study
Time representations can be made from nontemporal information in the brain: An MEG study
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DOI：
10.1093/cercor/bhj117
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发表时间：
2006-12-01
期刊：
影响因子：
3.7
通讯作者：
Kakigi, Ryusuke
中科院分区：
文献类型：
--
作者：
Noguchi, Yasuki;Kakigi, Ryusuke
感知时间的流逝是人类和动物的基本能力。在这里，我们使用脑磁图，研究我们大脑中的内部时钟系统如何将感官体验转换为时间表征。我们专注于人类受试者在看到视觉模式时高级视觉区域的神经活动，并估计其呈现时间。视觉区域的活动可以为我们提供关于受试者何时感知视觉模式出现和消失的神经指标，从而使我们能够测量大脑中的刺激持续时间。“将这些神经时间指数与心理学测量的刺激的主观持续时间进行比较，我们发现，在某些情况下，这两种持续时间可以在相反的方向上分离：尽管神经指数表示一个刺激的“较长”间隔超过另一个，但它在主观时间尺度上被感知为“较短”。相反，我们发现这些主观间隔与视觉模式引起的神经活动的强度密切相关，而不是时间。我们的研究结果表明，知觉神经活动的“非时间信息”，如神经反应的强度（而不是潜伏期），可以影响我们大脑中时间表征的形成。
Perceiving the passage of time is an essential ability for humans and animals. Here we used magnetoencephalography and investigated how our internal clock system in the brain converts sensory experiences into their time representations. We focused on neural activities in the high-level visual areas of human subjects when they saw visual patterns and estimated the duration of their presentation. The activities in the visual areas could give us neural indices about when subjects perceived the appearance and disappearance of visual patterns, thus enabling us to measure the stimulus duration "in the brain." Comparing these neural indices of time with subjective durations of stimuli measured psychophysically, we showed that, under some circumstances, these 2 durations can be dissociated in the opposite directions: although the neural index signals a "longer" interval of a stimulus over another one, it is perceived as "shorter" in subjective time scale. Instead, we found that these subjective intervals are closely linked to the strength, not timings, of neural activity evoked by visual patterns. Our results indicate that "nontemporal information" of perceptual neural activity, such as the strength (not latency) of neural responses, can influence the shaping of time representations in our brain.