跨视听通道返回抑制不对称性的神经机制

返回抑制(inhibition of return, IOR)可以优化搜索效率，对个体而言具有生态适应意义。尽管基于空间和非空间IOR存在于单通道，但是空间和非空间IOR在跨通道条件下的研究尚存在争议，且跨通道IOR存在视听通道加工的不对称性。本项目拟开展三个研究10个实验，采用ERP和fMRI技术，操纵线索和目标的感觉通道等变量，考察视-听和听-视下空间和非空间IOR不对称的神经机制：1)基于空间跨通道IOR是否存在时程上的不对称性？2)基于客体和特征的跨通道IOR不对称性是否具有相同的时程？3)基于空间和非空间跨通道IOR交互作用模式的不对称性。本项目将IOR研究系统地从单通道扩展到跨感觉通道，一方面丰富和完善IOR相关理论研究，另一方面为跨通道加工不对称性提供了来自注意抑制方面的新证据。更重要的是，将构建首个跨通道IOR脑网络图谱，为人类脑图谱的构建提供跨通道注意抑制方面的支持。

Inhibition of return (IOR) can optimize the visual search efficiency, which has high ecological adaptability for individuals. Although previous studies have shown that the spatial and non-spatial based IOR exist in the single sensory modality, there are many controversies on the spatial and non-spatial based IOR in the cross modalities, especially on an asymmetry in the audiovisual cross-modal inhibition of return. In this project, utilizing high temporal resolution of event related potential (ERP) and high spatial resolution of functional magnetic resonance imaging (fMRI) techniques, we designed 10 experiments and will apply the cue-target paradigm and manipulate factors of cue and target modalities to investigate: 1) Whether there is the asymmetry on the time course of spatial based IOR in cross-modal conditions? 2) Whether the asymmetry in object based and feature based IOR share the same time course in cross-modal conditions? 3) The asymmetry of interactions between spatial and non-spatial based IOR in cross-modal conditions. Taken together, this project will extend the IOR in a single sensory modality to the audiovisual cross-modalities systematically. On the one hand, it will enrich the theories of the IOR; on the other hand, it will provide the attentional inhibition evidence for the asymmetry in cross-modal processing. What’ s more, it will construct the first functional brain network for the cross-modal IOR, and provide the support of the cross-modal attention for the human brain network.