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晏婷, 周晖晖. 2019: 视觉搜索中前额眼动区与视皮层V4区神经活动同步化研究. 动物学研究, 40(5): 394-403. DOI: 10.24272/j.issn.2095-8137.2019.055
引用本文: 晏婷, 周晖晖. 2019: 视觉搜索中前额眼动区与视皮层V4区神经活动同步化研究. 动物学研究, 40(5): 394-403. DOI: 10.24272/j.issn.2095-8137.2019.055
Ting Yan, Hui-Hui Zhou. 2019: Synchronization between frontal eye field and area V4 during free-gaze visual search. Zoological Research, 40(5): 394-403. DOI: 10.24272/j.issn.2095-8137.2019.055
Citation: Ting Yan, Hui-Hui Zhou. 2019: Synchronization between frontal eye field and area V4 during free-gaze visual search. Zoological Research, 40(5): 394-403. DOI: 10.24272/j.issn.2095-8137.2019.055

视觉搜索中前额眼动区与视皮层V4区神经活动同步化研究

Synchronization between frontal eye field and area V4 during free-gaze visual search

  • 摘要: 前额叶与视皮层之间的信息交流对于视觉行为如视觉搜索至关重要。为研究其交流机制,我们在猕猴执行视觉搜索任务时同步记录前额眼动区(FEF)和视皮层V4区的神经元锋电位和局部场电位(LFP)。在自由搜索阶段,两个脑区之间的锋电位与LFP的同步性在θ频段(4-8赫兹)增强,而在α频段(8-13赫兹)减弱。另外,线索提示阶段各频段间的耦合程度可预测猕猴的行为表现: FEF脑区θ频段与V4脑区γ频段的耦合增加、FEF脑区α频段与V4脑区γ频段的耦合减弱均提示猕猴能更快完成视觉搜索任务。最后,特征注意能增强FEF与V4脑区之间的锋电位与LFP在γ和β频段的同步性,空间注意则削弱锋电位与LFP在30赫兹以下频段的同步性。我们的结果表明,视觉搜索过程中前额叶与视皮层之间的神经信号耦合是脑区间信息交流的重要方式之一。

     

    Abstract: Information flow between the prefrontal and visual cortices is critical for visual behaviors such as visual search. To investigate its mechanisms, we simultaneously recorded spike and local field potential (LFP) signals in the frontal eye field (FEF) and area V4 while monkeys performed a free-gaze visual search task. During free-gaze search, spike-LFP coherence between FEF and V4 was enhanced in the theta rhythm (4–8 Hz) but suppressed in the alpha rhythm (8–13 Hz). Cross-frequency couplings during the Cue period before the search phase were related to monkey performance, with higher FEF theta-V4 gamma coupling and lower FEF alpha-V4 gamma coupling associated with faster search. Finally, feature-based attention during search enhanced spike-LFP coherence between FEF and V4 in the gamma and beta rhythms, whereas overt spatial attention reduced coherence at frequencies up to 30 Hz. These results suggest that oscillatory coupling may play an important role in mediating interactions between the prefrontal and visual cortices during visual search.

     

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