Beta oscillations define discrete perceptual cycles in the somatosensory domain
Beta oscillations define discrete perceptual cycles in the somatosensory domain
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DOI：
10.1073/pnas.1501438112
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发表时间：
2015-09-29
影响因子：
11.1
通讯作者：
Lange, Joachim
中科院分区：
文献类型：
--
作者：
Baumgarten, Thomas J.;Schnitzler, Alfons;Lange, Joachim
无论是看电影、听歌，还是感受皮肤上的微风，我们都连贯地体验这些刺激，作为连续的、无缝的感知。然而，有一些罕见的感知现象反对连续感知，而是建议对感觉输入进行离散处理。然而，支持这种离散机制的经验证据仍然很少，并且完全来自视觉领域。在这里，我们展示了令人信服的证据，离散感知采样在体感域。使用脑磁图（MEG）和触觉的时间歧视任务在人类中，我们发现，振荡的α和低β带（8-20赫兹）周期在初级躯体感觉皮层代表离散的感知周期的神经生理学相关。我们的研究结果与离散感知采样的几个理论概念和视觉领域感知周期的经验证据相一致。重要的是，这些结果表明，离散的感知周期不是特定于域的，因此仅限于视觉域，但延伸到体感域。
Whether seeing a movie, listening to a song, or feeling a breeze on the skin, we coherently experience these stimuli as continuous, seamless percepts. However, there are rare perceptual phenomena that argue against continuous perception but, instead, suggest discrete processing of sensory input. Empirical evidence supporting such a discrete mechanism, however, remains scarce and comes entirely from the visual domain. Here, we demonstrate compelling evidence for discrete perceptual sampling in the somatosensory domain. Using magnetoencephalography (MEG) and a tactile temporal discrimination task in humans, we find that oscillatory alpha- and low beta-band (8-20 Hz) cycles in primary somatosensory cortex represent neurophysiological correlates of discrete perceptual cycles. Our results agree with several theoretical concepts of discrete perceptual sampling and empirical evidence of perceptual cycles in the visual domain. Critically, these results show that discrete perceptual cycles are not domain-specific, and thus restricted to the visual domain, but extend to the somatosensory domain.