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A dynamic fMRI study of illusory double-flash effect on human visual cortex

机译：虚幻双闪光对人视觉皮层的动态功能磁共振成像研究

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Functional MRI (fMRI) combined with the paired-stimuli paradigms (referred as dynamic fMRI) was used to study the “illusory double-flash” effect on brain activity in the human visual cortex. Three experiments were designed. The first two experiments aimed to examine the cross-modal neural interaction between the visual and auditory sensory systems caused by the illusory double-flash effect using combined auditory (beep sound) and visual (light flash) stimuli. The fMRI signal in the visual cortex was significantly increased in response to the illusory double flashes compared to the physical single flash when the inter-stimuli delay between the auditory and visual stimuli was 25 ms. This increase disappeared when the delay was prolonged to ~300 ms. These results reveal that the illusory double-flash effect can significantly affect the brain activity in the visual cortex, and the degree of this effect is dynamically sensitive to the inter-stimuli delay. The third experiment was to address the spatial differentiation of brain activation in the visual cortex in response to the illusory double-flash stimulation. It was found that the illusory double-flash effect in the human visual cortex is much stronger in the periphery than the fovea. This finding suggests that the periphery may be involved in high-level brain processing beyond the retinotopic visual perception. The behavioral measures conducted in this study indicate an excellent correlation between the fMRI results and behavioral performance. Finally, this work demonstrates a unique merit of fMRI for providing both temporal and spatial information regarding cross-modal neural interaction between different sensory systems.
机译：功能性MRI（fMRI）与配对刺激范例（称为动态fMRI）相结合，用于研究“虚幻的双闪光”对人类视觉皮层大脑活动的影响。设计了三个实验。前两个实验旨在研究使用组合的听觉（哔声）和视觉（轻声）刺激，由虚幻的双闪光效应引起的视觉和听觉感觉系统之间的交叉模式神经相互作用。当听觉和视觉刺激之间的间隔时间为25 ms时，与物理单次闪烁相比，视觉上皮层中的fMRI信号响应于虚幻的两次闪烁而显着增加。当延迟延长到〜300 ms时，这种增加消失了。这些结果表明，虚幻的双闪光效应可以显着影响视觉皮层的大脑活动，并且这种效应的程度对刺激间的延迟是动态敏感的。第三个实验是针对视觉双闪刺激，解决视觉皮层中大脑激活的空间差异。发现在人的视觉皮层中，虚幻的双闪光效应比中央凹强得多。这一发现表明，在视网膜外视力感知之外，外围可能还参与了高级脑处理。在这项研究中进行的行为措施表明功能磁共振成像结果与行为表现之间的极好的关联。最后，这项工作证明了功能磁共振成像的独特优点，它可以提供有关不同感觉系统之间的交叉模式神经相互作用的时空信息。

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