Aim of the study was to evaluate the influence of the EEG channels number on the brain networks’ analysis, to establish whether and how much higher density EEG actually contributes to add supplementary information to brain networks analyses. 59 electrodes EEGs were recorded in 20 healthy subjects in eyes open and closed condition. For each condition, we analyzed the recording dataset of 59 channels, and three sub-datasets obtained by the selection of 44, 30, 19 channels from the 59 ones. Then we computed the EEG sources of current density and evaluated the SW index in the four EEGs data montages. Results showed that in the eyes open condition the number of recording channels influences more the SW index modulation respect that in the eyes closed condition. Conversely, in the eyes closed condition the brain activity is less affected by specific brain regions’ activations and the signal’s generators produced not significant variations on EEG data and consequently the small world network measure is not affected by the recording channels number. We can conclude that in the eyes closed condition, the 19 EEG channels is an acceptable montage to study brain networks’ modulations, to both detect the higher and the lower brain waves’ frequencies.

该研究的目的是评估 EEG 通道数量对大脑网络分析的影响，以确定更高密度的 EEG 是否以及有多少实际上有助于为大脑网络分析添加补充信息。20 名健康受试者在睁眼和闭眼状态下记录了 59 次电极脑电图。对于每个条件，我们分析了 59 个通道的记录数据集，以及从 59 个通道中选择 44、30、19 个通道获得的三个子数据集。然后我们计算了电流密度的 EEG 源并评估了四个 EEG 数据蒙太奇中的 SW 指数。结果表明，在睁眼条件下，记录通道的数量比在闭眼条件下对 SW 指数调制方面的影响更大。反过来，在闭眼条件下，大脑活动受特定大脑区域激活的影响较小，并且信号发生器不会对 EEG 数据产生显着变化，因此小世界网络测量不受记录通道数的影响。我们可以得出结论，在闭眼条件下，19 个 EEG 通道是研究大脑网络调制的可接受蒙太奇，以检测较高和较低的脑电波频率。