Neural "ignition": enhanced activation linked to perceptual awareness in human ventral stream visual cortex.
Neural "ignition": enhanced activation linked to perceptual awareness in human ventral stream visual cortex.
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DOI：
10.1016/j.neuron.2009.11.001
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发表时间：
2009-11-25
期刊：
影响因子：
16.2
通讯作者：
Malach, Rafael
中科院分区：
文献类型：
--
作者：
Fisch, Lior;Privman, Eran;Ramot, Michal;Harel, Michal;Nir, Yuval;Kipervasser, Svetlana;Andelman, Fani;Neufeld, Miri Y.;Kramer, Uri;Fried, Itzhak;Malach, Rafael
人类识别性能的特征在于感知状态的突然变化。理解这种转变背后的神经元动力学可以为识别和感知意识的机制提供重要的见解。在这里，我们检查了病人监测的临床目的与多个硬膜下电极。这些患者参与了一个反向掩蔽实验，在这个实验中，各种物体类别的图片被短暂地呈现在一个面具之后。我们记录了11名患者的445个电极的ECoG。我们发现，伽马功率（30-70 Hz）和诱发反应显著增加，特别是与成功识别相关。增强的激活发生在刺激开始后150-200 ms，并持续超过刺激呈现。我们建议，伽马和诱发电位激活反映了复发性神经元活动的快速增加，在意识意识中出现可识别的视觉感知中起着关键作用。
Human recognition performance is characterized by abrupt changes in perceptual states. Understanding the neuronal dynamics underlying such transitions could provide important insights into mechanisms of recognition and perceptual awareness. Here we examined patients monitored for clinical purposes with multiple subdural electrodes. The patients participated in a backward masking experiment in which pictures of various object categories were presented briefly followed by a mask. We recorded ECoG from 445 electrodes placed in 11 patients. We found a striking increase in gamma power (30–70 Hz) and evoked responses specifically associated with successful recognition. The enhanced activation occurred 150–200 ms after stimulus onset and consistently outlasted the stimulus presentation. We propose that the gamma and evoked potential activations reflect a rapid increase in recurrent neuronal activity that plays a critical role in the emergence of a recognizable visual percept in conscious awareness.
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