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首页> 外文期刊>The European Journal of Neuroscience >Neural correlates of visuomotor adjustments during scaling of human finger movements
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Neural correlates of visuomotor adjustments during scaling of human finger movements

机译：人体手指运动缩放过程中的求解器调整的神经相关性

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Visually guided finger movements include online feedback of current effector position to guide target approach. This visual feedback may be scaled or otherwise distorted by unpredictable perturbations. Although adjustments to visual feedback scaling have been studied before, the underlying brain activation differences between upscaling (visual feedback larger than real movement) and downscaling (feedback smaller than real movement) are currently unknown. Brain activation differences between upscaling and downscaling might be expected because within-trial adjustments during upscaling require corrective backwards accelerations, whereas correcting for downscaling requires forward accelerations. In this behavioural and fMRI study we investigated adjustments during up- and downscaling in a target-directed finger flexion-extension task with real-time visual feedback. We found that subjects made longer and more complete within-trial corrections for downscaling perturbations than for upscaling perturbations. The finger task activated primary motor (M1) and somatosensory (S1) areas, premotor and parietal regions, basal ganglia, and cerebellum. General scaling effects were seen in the right pre-supplementary motor area, dorsal anterior cingulate cortex, inferior parietal lobule, and dorsolateral prefrontal cortex. Stronger activations for down- than for upscaling were observed in M1, supplementary motor area (SMA), S1 and anterior cingulate cortex. We argue that these activation differences may reflect differing online correction for upscaling vs. downscaling during finger flexion-extension.
机译：视觉引导的手指移动包括电流效应位置的在线反馈，以引导目标方法。该视觉反馈可以通过不可预测的扰动来缩放或以其他方式扭曲。虽然之前已经研究了对视觉反馈缩放的调整，但是在升高（视觉反馈大于实际运动的视觉反馈）之间的潜在脑激活差异（比实际运动小于真实运动）是未知的。脑激活升高和缩小之间的脑激活差异可能是预期的，因为在上升期间试验内部调整需要纠正的向后加速，而校正次要速度需要转发加速。在这种行为和FMRI研究中，我们在具有实时视觉反馈的目标导向的手指屈曲 - 扩展任务中调查调整和缩小。我们发现受试者在较高的扰动较高的扰动中进行更长，更完整的试验校正。手指任务激活的主要电机（M1）和Somatosove（S1）区域，热球和顶点地区，基底神经节和小脑。普通缩放效应在右预补充电动机面积，背侧铰接皮质，劣质前叶和背侧前额叶皮质中看到。在M1，补充电动机面积（SMA），S1和前铰接皮质中，观察到下低于上升的更强的激活。我们认为，这些激活差异可能反映了在手指屈曲 - 延伸期间较高与升高的在线校正。

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