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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >The neurophysiological time pattern of illusionary visual perceptual transitions: a simultaneous EEG and fMRI study.
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The neurophysiological time pattern of illusionary visual perceptual transitions: a simultaneous EEG and fMRI study.

机译：幻觉视觉知觉转换的神经生理时间模式：同步的脑电图和功能磁共振成像研究。

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摘要

Several divergent cortical mechanisms generating multistability in visual perception have been suggested. Here, we investigated the neurophysiologic time pattern of multistable perceptual changes by means of a simultaneous recording with electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Volunteers responded to the subjective perception of a sudden change between stable patterns of illusionary motion (multistable transition) during a stroboscopic paradigm. We found a global deceleration of the EEG frequency prior to a transition and an occipital-accentuated acceleration after a transition, as obtained by low-resolution electromagnetic tomography analysis (LORETA) analysis. A decrease in BOLD response was found in the prefrontal cortex before, and an increase after the transitions was observed in the right anterior insula, the MT/V5 regions and the SMA. The thalamus and left superior temporal gyrus showed a pattern of decrease before and increase after transitions. No such temporal course was found in the control condition. The multimodal approach of data acquisition allows us to argue that the top-down control of illusionary visual perception depends on selective attention, and that a diminution of vigilance reduces selective attention. These are necessary conditions to allow for the occurrence of a perception discontinuity in absence of a physical change of the stimulus.
机译：已经提出了几种在视觉感知中产生多重稳定性的皮质机制。在这里，我们通过脑电图（EEG）和功能磁共振成像（fMRI）的同时记录，研究了多稳态知觉变化的神经生理时间模式。志愿者对频闪观测范式中幻觉运动的稳定模式（多稳态过渡）之间突然变化的主观感觉做出了反应。通过低分辨率电磁层析成像分析（LORETA）分析，我们发现过渡前EEG频率的整体减速度和过渡后枕骨的加速加速度。之前在前额叶皮层中发现了BOLD响应的减少，而在右前岛，MT / V5区和SMA中观察到过渡之后的BOLD响应有所增加。丘脑和左颞上回显示出过渡之前减少和过渡之后增加的模式。在控制条件下没有发现这样的时间过程。数据获取的多模式方法使我们能够论证，虚幻视觉感知的自上而下控制取决于选择性注意，而警惕性的降低会减少选择性注意。这些是在没有刺激物理变化的情况下允许感知不连续发生的必要条件。

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