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首页> 外文期刊>The European Journal of Neuroscience >Cortical mechanisms of smooth pursuit eye movements with target blanking. An fMRI study.
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Cortical mechanisms of smooth pursuit eye movements with target blanking. An fMRI study.

机译：具有目标消隐功能的平滑追踪眼球运动的皮质机制。功能磁共振成像研究。

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Abstract Smooth pursuit eye movements are evoked by retinal image motion of visible moving objects and can also be driven by the internal representation of a target due to extraretinal mechanisms (e.g. efference copy). To delineate the corresponding neuronal correlates, functional magnetic resonance imaging at 1.5 T was applied during smooth pursuit at 10 degrees /s with continuous target presentation and target blanking for 1 s to 16 right-handed healthy males. Eye movements were assessed during scanning sessions by infra-red reflection oculography. Smooth pursuit performance was optimal when the target was visible but decreased to a residual velocity of about 30% of the velocity observed during continuous target presentation. Random effects analysis of the imaging data yielded an activation pattern for smooth pursuit in the absence of a visual target (in contrast to continuous target presentation) which included a number of cortical areas in which extraretinal information is available such as the frontal eye field, the superior parietal lobe, the anterior and the posterior intraparietal sulcus and the premotor cortex, and also the supplementary and the presupplementary eye field, the supramarginal gyrus, the dorsolateral prefrontal cortex, cerebellar areas and the basal ganglia. We suggest that cortical mechanisms such as prediction, visuo-spatial attention and transformation, multimodal visuomotor control and working memory are of special importance for maintaining smooth pursuit eye movements in the absence of a visible target.
机译：摘要平滑追踪眼的运动是由可见运动物体的视网膜图像运动引起的，也可能是由于视网膜外机制（例如干涉复制）而由目标的内部表示驱动的。为了描述相应的神经元相关性，在以10度/ s的速度平稳跟踪过程中，以1.5 T的功能磁共振成像对16位惯用右手的健康男性进行了连续目标显示和目标消隐1 s。在扫描过程中，通过红外反射眼底镜评估了眼睛的运动。当目标可见时，平滑追击性能是最佳的，但降低到残余速度约为连续目标显示期间观察到的速度的30％。成像数据的随机效应分析产生了在没有视觉目标（与连续目标呈现相反）的情况下平滑追击的激活模式，其中包括多个皮质区域，其中可利用视网膜外信息，例如额叶视野，顶叶上叶，顶壁前，后沟和前运动皮层，以及补充眼前区域，上眼前回，前外侧背额叶皮层，小脑区域和基底神经节。我们建议皮质机制，如预测，视觉空间注意和转换，多模式视觉运动控制和工作记忆，对于在没有可见目标的情况下保持平稳的追踪眼球运动特别重要。

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