捷克技术大学Kamil Vlcek研究小组揭示了脑电研究记忆引导动作中视觉流相互作用的神经动力学。该项研究成果发表在2025年3月17日出版的《神经科学通报》上。

以脑电为研究对象，研究了记忆引导动作时脑电与脑电之间的神经动力学和功能连通性。在涉及物体识别和位置记忆的延迟动作任务中，课题组人员追踪了背流的下顶叶、腹侧颞叶皮层以及海马体的神经活动。课题组发现，在延迟期间，两个脑流的阿尔法能量都有所增加，这表明它们在维持空间视觉信息方面的作用。此外，小组记录到海马区的α能量在延迟期间有所增加，但只有在需要记住物体的身份和位置时才会增加。

研究团队还记录到在编码和延迟期间，下顶叶与颞腹侧皮层以及下顶叶与海马皮层之间的θ波带相位同步增加。格兰杰因果分析表明，在不同的任务阶段，顶叶下小叶、颞叶腹侧皮层和海马之间存在动态的、频率特异性的定向相互作用。他们的研究为背侧和腹侧脑流之间的密切互动提供了独特的电生理证据，支持了一个综合处理模型，其中两种脑流都有助于记忆引导的行为。

据了解，背侧和腹侧视觉流被认为在动作的视觉处理中起着不同的作用：背侧视觉流被认为支持实时动作，而腹侧视觉流促进记忆引导的动作。然而，最近的证据表明，这些流具有更综合的功能。

附：英文原文

Title: Neural Dynamics of Visual Stream Interactions During Memory-Guided Actions Investigated by Intracranial EEG

Author: Moraresku, Sofiia, Hammer, Jiri, Dimakopoulos, Vasileios, Kajsova, Michaela, Janca, Radek, Jezdik, Petr, Kalina, Adam, Marusic, Petr, Vlcek, Kamil

Issue&Volume: 2025-03-17

Abstract: The dorsal and ventral visual streams have been considered to play distinct roles in visual processing for action: the dorsal stream is assumed to support real-time actions, while the ventral stream facilitates memory-guided actions. However, recent evidence suggests a more integrated function of these streams. We investigated the neural dynamics and functional connectivity between them during memory-guided actions using intracranial EEG. We tracked neural activity in the inferior parietal lobule in the dorsal stream, and the ventral temporal cortex in the ventral stream as well as the hippocampus during a delayed action task involving object identity and location memory. We found increased alpha power in both streams during the delay, indicating their role in maintaining spatial visual information. In addition, we recorded increased alpha power in the hippocampus during the delay, but only when both object identity and location needed to be remembered. We also recorded an increase in theta band phase synchronization between the inferior parietal lobule and ventral temporal cortex and between the inferior parietal lobule and hippocampus during the encoding and delay. Granger causality analysis indicated dynamic and frequency-specific directional interactions among the inferior parietal lobule, ventral temporal cortex, and hippocampus that varied across task phases. Our study provides unique electrophysiological evidence for close interactions between dorsal and ventral streams, supporting an integrated processing model in which both streams contribute to memory-guided actions.

DOI: 10.1007/s12264-025-01371-x

Source: https://link.springer.com/article/10.1007/s12264-025-01371-x