Electrophysiological correlates of gist perception: a steady-state visually evoked potentials study
Electrophysiological correlates of gist perception: a steady-state visually evoked potentials study
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主旨知觉的电生理学相关性：稳态视觉诱发电位研究
DOI：
10.1007/s00221-020-05819-6
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发表时间：
2020
影响因子：
2
通讯作者：
Gruber
中科院分区：
文献类型：
--
作者：
Radtke;Schöne;Martens;Gruber
主旨知觉指的是对一个场景的实质或一般意义的感知。为了研究其神经机制，我们使用了稳态视觉诱发电位（SSVEP）方法-一种诱发振荡皮层反应，其频率与视觉刺激在此频率下闪烁的频率相同。两个相邻的刺激以不同的频率f1和f2闪烁，例如，屏幕左侧的太阳图以8.6 Hz闪烁，屏幕右侧的阳伞图以12 Hz闪烁。SSVEP使我们能够通过提取f1和f2处的振荡脑反应来分离对两种不同刺激的反应。此外，它还允许研究互调频率，即大脑对1和f2的线性组合的反应（这里是f1 +f2= 20.6 Hz），作为处理输入的共享方面的指标，即要点感知（这里是海滩场景）。我们记录了18名参与者的高密度EEG。结果显示清晰和可分离的神经元振荡在f1和f2。此外，枕叶电极显示出增加幅度的互调频率相关相比，无关的对。互调频率的增加与双侧颞叶和顶叶激活，可能反映了当地的对象表征的相互作用作为激活的要旨网络的基础。这项研究表明，SSVEP是一个很好的方法来解开多刺激显示在主旨知觉的背景下的处理机制。
Gist perception refers to perceiving the substance or general meaning of a scene. To investigate its neuronal mechanisms, we used the steady-state visually evoked potential (SSVEP) method—an evoked oscillatory cortical response at the same frequency as a visual stimulus flickered at this frequency. Two neighboring stimuli were flickered at different frequenciesf1andf2, for example, a drawing of a sun on the left side of the screen flickering at 8.6 Hz and the drawing of a parasol on the right side of the screen flickering at 12 Hz. SSVEPs enabled us to separate the responses to the two distinct stimuli by extracting oscillatory brain responses atf1andf2. Additionally, it allowed to investigate intermodulation frequencies, that is, the brain’s response at a linear combination off1andf2(here atf1+f2= 20.6 Hz) as an indicator of processing shared aspects of the input, that is, gist perception (here: a beach scene). We recorded high-density EEG of 18 participants. Results revealed clear and separable neuronal oscillations atf1andf2. Additionally, occipital electrodes showed increased amplitudes at the intermodulation frequency in related as compared to unrelated pairs. The increase in intermodulation frequency was associated with bilateral temporal and parietal lobe activation, probably reflecting the interaction of local object representations as a basis for activating the gist network. The study demonstrates that SSVEPs are an excellent method to unravel mechanisms underlying the processing within multi-stimulus displays in the context of gist perception.
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DOI：
--
发表时间：
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DOI：
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发表时间：
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影响因子：
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