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Electrophysiological correlates of gist perception: a steady-state visually evoked potentials study.
Experimental Brain Research ( IF 2 ) Pub Date : 2020-05-03 , DOI: 10.1007/s00221-020-05819-6
Elise L Radtke 1 , Benjamin Schöne 1 , Ulla Martens 2 , Thomas Gruber 1
Affiliation  

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 frequencies f1 and f2, 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 at f1 and f2. Additionally, it allowed to investigate intermodulation frequencies, that is, the brain's response at a linear combination of f1 and f2 (here at f1 + 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 at f1 and f2. 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.

中文翻译:

要点感知的电生理相关性:视觉诱发电位的稳态研究。

要点感知是指感知场景的实质或一般含义。为了研究其神经元机制,我们使用了稳态视觉诱发电位(SSVEP)方法-诱发的振荡皮层反应,其频率与以该频率闪烁的视觉刺激相同。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的频率闪烁,屏幕右侧的阳伞的图像以12 Hz的频率闪烁。SSVEP使我们能够通过提取在f1和f2处的振荡性大脑反应来分离对两种不同刺激的反应。此外,它还可以研究互调频率,即大脑在f1和f2的线性组合(此处为f1 + f2 = 20)下的响应。6 Hz)作为处理输入的共享方面的指示,即要点感知(此处为海滩场景)。我们记录了18位参与者的高密度脑电图。结果显示在f1和f2处清晰可分离的神经元振荡。另外,与互不相关的对相比,枕形电极在互调频率处的幅度增加。互调频率的增加与双边颞叶和顶叶的激活有关,可能反映了作为激活gist网络基础的本地对象表示的相互作用。这项研究表明,SSVEP是在要点感知的背景下揭示多刺激显示器内加工机制的极好方法。我们记录了18位参与者的高密度脑电图。结果显示在f1和f2处清晰可分离的神经元振荡。另外,与不相关的对相比,枕电极在互调频率处的振幅增加。互调频率的增加与双边颞叶和顶叶的激活有关,可能反映了作为激活gist网络基础的本地对象表示的相互作用。这项研究表明,SSVEP是在要点感知的背景下揭示多刺激显示器内加工机制的极好方法。我们记录了18位参与者的高密度脑电图。结果显示在f1和f2处清晰可分离的神经元振荡。另外,与不相关的对相比,枕电极在互调频率处的振幅增加。互调频率的增加与双边颞叶和顶叶的激活有关,可能反映了作为激活gist网络基础的本地对象表示的相互作用。这项研究表明,SSVEP是在要点感知的背景下揭示多刺激显示器内加工机制的极好方法。与互不相关的配对相比,枕形电极在互调频率处的幅度增加。互调频率的增加与双边颞叶和顶叶的激活有关,可能反映了作为激活gist网络基础的本地对象表示的相互作用。这项研究表明,SSVEP是在要点感知的背景下揭示多刺激显示器内加工基础机制的极好方法。与互不相关的配对相比,枕形电极在互调频率处的幅度增加。互调频率的增加与双边颞叶和顶叶的激活有关,可能反映了作为激活gist网络基础的本地对象表示的相互作用。这项研究表明,SSVEP是在要点感知的背景下揭示多刺激显示器内加工机制的极好方法。
更新日期:2020-05-03
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