The data acquired at different scalp EEG electrodes when human subjects are exposed to speech stimuli are highly redundant. The redundancy is partly due to volume conduction effects and partly due to localized regions of the brain synchronizing their activity in response to the stimuli. In a competing talker scenario, we use a recent measure of directed redundancy to assess the amount of redundant information that is causally conveyed from the attended stimuli to the left temporal region of the brain. We observe that for the attended stimuli, the transfer entropy as well as the directed redundancy is proportional to the correlation between the speech stimuli and the reconstructed signal from the EEG signals. This demonstrates that both the rate as well as the rate-redundancy are inversely proportional to the distortion in neural speech tracking. Thus, a greater rate indicates a greater redundancy between the electrode signals, and a greater correlation between the reconstructed signal and the attended stimuli. A similar relationship is not observed for the distracting stimuli.

翻译：当人类受试者暴露于语音刺激时，不同头皮脑电图电极采集的数据具有高度冗余性。这种冗余部分源于容积传导效应，部分源于大脑局部区域响应刺激而同步其活动。在竞争性说话者场景中，我们使用一种最新的定向冗余度量方法，评估从被注意刺激到大脑左颞叶区域因果传递的冗余信息量。我们观察到，对于被注意刺激，传递熵以及定向冗余均与语音刺激和脑电信号重建信号之间的相关性成正比。这表明，率以及率-冗余均与神经语音追踪中的失真成反比。因此，更高的率意味着电极信号间更大的冗余性，以及重建信号与被注意刺激之间更强的相关性。对于干扰刺激，未观察到类似关系。