Spatiotemporal brain dynamics of auditory temporal assimilation.

Spatiotemporal brain dynamics of auditory temporal assimilation.
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DOI:
10.1038/s41598-017-11631-0
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发表时间:
2017-09-12
期刊:
影响因子:
4.6
通讯作者:
Tobimatsu S
Tobimatsu S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hironaga N;Mitsudo T;Hayamizu M;Nakajima Y;Takeichi H;Tobimatsu S

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时间是一个基本维度,但毫秒级的判断有时会导致感知错觉。我们之前引入了一种“时间收缩错觉”,使用诱发听觉时间同化(ATA)的心理学范式。在 ATA 中,由三个听觉刺激标记的两个连续间隔(T1 和 T2)的持续时间可以被感知为相等,而实际上它们并不相等。在这里,我们使用脑磁图(MEG)研究人类时间判断的时空概况。行为结果显示出典型的 ATA:当 T2 − T1 ≤ +80 ms 时,参与者判断 T1 和 T2 相等。 MEG 源定位分析表明,T2 期间颞顶交界处 (TPJ) 出现判断和无判断条件之间的区域活动差异。 TPJ 中的这一观察结果可能表明,当 T1 ≠ T2 时,TPJ 参与了编码过程。当参与者进行时间判断时,无论刺激模式如何,额下回(IFG)的激活都会增强。此外,就在最终标记之后,IFG 中的活性特别针对时间收缩模式而增强。这表明 IFG 的活动也与时间间隔平等的虚幻感知有关。基于这些观察,我们提出了用于判断人脑时间平等的神经特征。
Time is a fundamental dimension, but millisecond-level judgments sometimes lead to perceptual illusions. We previously introduced a “time-shrinking illusion” using a psychological paradigm that induces auditory temporal assimilation (ATA). In ATA, the duration of two successive intervals (T1 and T2), marked by three auditory stimuli, can be perceived as equal when they are not. Here, we investigate the spatiotemporal profile of human temporal judgments using magnetoencephalography (MEG). Behavioural results showed typical ATA: participants judged T1 and T2 as equal when T2 − T1 ≤ +80 ms. MEG source-localisation analysis demonstrated that regional activity differences between judgment and no-judgment conditions emerged in the temporoparietal junction (TPJ) during T2. This observation in the TPJ may indicate its involvement in the encoding process when T1 ≠ T2. Activation in the inferior frontal gyrus (IFG) was enhanced irrespective of the stimulus patterns when participants engaged in temporal judgment. Furthermore, just after the final marker, activity in the IFG was enhanced specifically for the time-shrinking pattern. This indicates that activity in the IFG is also related to the illusory perception of time-interval equality. Based on these observations, we propose neural signatures for judgments of temporal equality in the human brain.
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