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Nonlinear interactions in the visual system: a steady-state VEP study

机译：视觉系统中的非线性相互作用：稳态VEP研究

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To study the interaction between different receptive fields in human visual processing, the present study investigated the steady-state evoked potentials (ss-VEPs) by two light emitting diodes (LEDs) lit at the different temporal frequencies, which were presented separately to each hemivisual field of the subjects. Two LEDs set in front of the subject were energized at different temporal frequencies of combinations of 7, 9, 11, and 13 Hz. The subject was asked to look at a fixation point at the midpoint. Nineteen EEGs were recorded and the data were averaged 80-100 times triggered at the peak of a light intensity for each quartile range of phase lag. The phase dependency was studied by comparing steady-state visual evoked potentials (ss-VEPs) and also by using higher-order spectra (HOS). The interactions between background EEGs and ss-VEPs were also investigated. The power spectra of ss-VEPs exhibited peaks at the frequency other than those of stimuli. HOS analysis showed that nonlinear phase coupling between the peak frequencies of ss-VEPs were partially detected. Frequencies of the visual stimuli were suspected to reflect onto the bilateral visual area. The changes in the ss-VEPs triggered by the peak of stimuli were affected by the phase lag between bilateral stimuli. Our results are suggestive of some nonlinear interactions in the visual processing over the different areas.
机译：为了研究人类视觉处理中不同接收领域之间的相互作用，本研究研究了在不同时间频率下点燃的两个发光二极管（LED）的稳态诱发电位（SS-VEP），其分别向每个内部移动呈现受试者的领域。在主题前面设置的两个LED在7,9,11和13Hz的不同时间频率下通电。要求主题在中点看一个固定点。记录了十九个EEGS，数据平均为80-100次，在每个四分位数的相滞后的光强度的峰值下触发。通过比较稳态视觉诱发电位（SS-VEPS）以及使用高阶光谱（HOS）来研究相位依赖性。还研究了背景EEGS和SS-VEPS之间的相互作用。 SS-VEPS的功率光谱在除刺激之外的频率下表现出峰。 HOS分析表明，部分检测到SS-VEPS的峰值频率之间的非线性相偶联。怀疑视觉刺激的频率反射到双边视觉区域上。由刺激峰触发的SS-VEPS的变化受到双侧刺激之间的相滞后的影响。我们的结果旨在提示在不同区域的视觉处理中的一些非线性相互作用。

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