The Neural Signature of Subliminal Visuomotor Priming: Brain Activity and Functional Connectivity Profiles
The Neural Signature of Subliminal Visuomotor Priming: Brain Activity and Functional Connectivity Profiles
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DOI：
10.1093/cercor/bhv070
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发表时间：
2016-06-01
期刊：
影响因子：
3.7
通讯作者：
Kiefer, Markus
中科院分区：
文献类型：
--
作者：
Ulrich, Martin;Kiefer, Markus
无意识视觉运动启动被定义为与不同（不一致条件）运动反应相比，映射到相同（一致条件）的目标形状的反应时间（RT）或准确性方面的优势，因为先前的潜意识呈现的启动形状已被证明可以调节视觉运动网络内的活动。由顶叶和额叶运动区组成在以前的功能性磁共振成像（fMRI）研究中。本fMRI研究调查是否，除了大脑活动的变化，无意识的视觉启动的结果在调制的功能连接配置文件。与不一致的试验相比，一致的活动在双侧额下回和内侧上级、顶下小叶、右侧尾状核和丘脑邻近部分较低。腹侧视觉流区之间的功能连接在一致相对于不一致的条件下增加（例如，距状回、梭状回和舌回）、中央前回、辅助运动区、后顶叶区、额下回和尾状核。我们的研究结果表明，增加视觉区域之间的耦合，反映更高的处理效率，是一个重要的神经机制，无意识的视觉启动，除了激活的幅度的变化。
Unconscious visuomotor priming defined as the advantage in reaction time (RT) or accuracy for target shapes mapped to the same (congruent condition) when compared with a different (incongruent condition) motor response as a preceding subliminally presented prime shape has been shown to modulate activity within a visuomotor network comprised of parietal and frontal motor areas in previous functional magnetic resonance imaging (fMRI) studies. The present fMRI study investigated whether, in addition to changes in brain activity, unconscious visuomotor priming results in a modulation of functional connectivity profiles. Activity associated with congruent compared with incongruent trials was lower in the bilateral inferior and medial superior frontal gyri, in the inferior parietal lobules, and in the right caudate nucleus and adjacent portions of the thalamus. Functional connectivity increased under congruent relative to incongruent conditions between ventral visual stream areas (e.g., calcarine, fusiform, and lingual gyri), the precentral gyrus, the supplementary motor area, posterior parietal areas, the inferior frontal gyrus, and the caudate nucleus. Our findings suggest that an increase in coupling between visuomotor regions, reflecting higher efficiency of processing, is an important neural mechanism underlying unconscious visuomotor priming, in addition to changes in the magnitude of activation.