Regarding the evoked potential (EP) as a superposition of evoked EEG rhythms in several frequency ranges, we investigated the following issue: Are distinct evoked rhythms, in particular the alpha (8-15 Hz) response, related to separable physiological processes? Frequency domain analysis of EPs was used to evaluate results of cross-modality experiments, i.e.: responses to auditory stimuli were simultaneously recorded from the auditory cortex (adequate stimulation) and from the visual cortex (inadequate stimulation). Responses to visual stimuli were recorded from the same sites. The results of these experiments and further measurements (EEG and MEG responses in humans, among them multiple sclerosis patients) are consistent in the following respect: The amplitudes of alpha responses are dependent on whether or not a stimulus applied is adequate. Alpha responses may thus be related mostly to primary sensory processing. In contrast, theta responses (4-7 Hz) were observed for adequate as well as inadequate stimuli. They may be related rather to associative and cognitive processing than to primary sensory processing. Thus frequency responses, in particular the alpha response, are not artificial results of digital filtering, but functionally significant brain responses.

译文

:关于诱发电位(EP)在几个频率范围内的诱发脑电节律的叠加,我们研究了以下问题:明显的诱发节律,特别是alpha(8-15 Hz)反应与可分离的生理过程有关吗? EP的频域分析用于评估交叉模态实验的结果,即:同时记录听觉皮层(充分刺激)和视觉皮层(不充分刺激)对听觉刺激的反应。从相同部位记录对视觉刺激的反应。这些实验的结果和进一步的测量结果(人类的EEG和MEG反应,其中包括多发性硬化症患者)在以下方面是一致的:α反应的幅度取决于所施加的刺激是否足够。因此,阿尔法响应可能主要与主要的感觉处理有关。相反,对于适当的和不充分的刺激观察到θ响应(4-7Hz)。它们可能与联想和认知处理有关,而不是与主要的感觉处理有关。因此,频率响应,尤其是alpha响应,不是数字滤波的人工结果,而是功能上重要的大脑响应。

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