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Decoding Movement Goals from the Fronto-Parietal Reach Network

机译:从额顶接触网络解码运动目标

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摘要

During reach planning, fronto-parietal brain areas need to transform sensory information into a motor code. It is debated whether these areas maintain a sensory representation of the visual cue or a motor representation of the upcoming movement goal. Here, we present results from a delayed pro-/anti-reach task which allowed for dissociating the position of the visual cue from the reach goal. In this task, the visual cue was combined with a context rule (pro vs. anti) to infer the movement goal. Different levels of movement goal specification during the delay were obtained by presenting the context rule either before the delay together with the visual cue (specified movement goal) or after the delay (underspecified movement goal). By applying functional magnetic resonance imaging (fMRI) multivoxel pattern analysis (MVPA), we demonstrate movement goal encoding in the left dorsal premotor cortex (PMd) and bilateral superior parietal lobule (SPL) when the reach goal is specified. This suggests that fronto-parietal reach regions (PRRs) maintain a prospective motor code during reach planning. When the reach goal is underspecified, only area PMd but not SPL represents the visual cue position indicating an incomplete state of sensorimotor integration. Moreover, this result suggests a potential role of PMd in movement goal selection.
机译:在伸手可及的距离规划中,额顶大脑区域需要将感觉信息转换为运动代码。这些区域是否保持视觉提示的感觉表现或即将到来的运动目标的运动表现存在争议。在这里,我们介绍了延迟的前/后防范围任务的结果,该任务允许将视觉提示的位置与范围目标分离。在此任务中,视觉提示与上下文规则(赞成与反对)相结合以推断运动目标。通过在延迟之前与视觉提示(指定的运动目标)或延迟之后(未指定的运动目标)一起呈现上下文规则,可以获得延迟期间不同级别的运动目标规范。通过应用功能磁共振成像(fMRI)多体素模式分析(MVPA),当指定达到目标时,我们演示了左前运动前皮质(PMd)和双侧顶叶小叶(SPL)中的运动目标编码。这表明额顶规划范围(PRR)在规划范围时保持预期的运动代码。当未达到目标时,只有区域PMd而不是SPL代表视觉提示位置,指示感觉运动积分状态不完整。此外,该结果表明了PMd在运动目标选择中的潜在作用。

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