Motor behavior often occurs in environments with multiple goal options that can vary during the ongoing action. We explored this situation by requiring subjects to select between different target options during an ongoing reach. During split trials the original target was replaced with a left and a right flanking target and participants had to select between them. This contrasted with the standard jump trials where the original target would be replaced with a single flanking target, left or right. When participants were instructed to follow their natural tendency they all tended to select the split target nearest the original. The near-target preference was more prominent with increased spatial disparity between the options and when participants could preview the potential options. Moreover, explicit instruction to obtain the "far" target during split trials resulted many errors compared to a "near" instruction, ~50% vs ~15%. Online reaction times to target change were delayed in split trials compared to jump trials, ~200 ms vs ~150 ms, but also highly automatic. And trials which correctly obtained the instructed "far" target were delayed by a further ~50ms unlike those which incorrectly obtained the "near" target. We also observed non-specific responses from arm muscles at the jump trial latency during split trials. Taken together, our results indicate that online selection of reach targets is automatically linked to the spatial distribution of the options though at greater delays than redirecting to a single target.

中文翻译：

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在目标分割期间，伸手可及的动作会自动重定向到附近的选项。

运动行为通常发生在具有多个目标选项的环境中，这些选项在正在进行的动作中可能会有所不同。我们通过要求受试者在持续接触期间在不同的目标选项之间进行选择来探索这种情况。在拆分试验期间，原始目标被左翼和右翼目标取代，参与者必须在它们之间进行选择。这与标准跳跃试验形成对比，在标准跳跃试验中，原始目标将被替换为单个左侧或右侧侧翼目标。当参与者被指示遵循他们的自然倾向时，他们都倾向于选择最接近原始目标的分裂目标。随着选项之间的空间差异增加以及参与者何时可以预览潜在选项，近目标偏好更加突出。此外，获得“远”的明确指令 与“接近”指令相比，拆分试验期间的目标导致了许多错误，~50% vs ~15%。与跳跃试验相比，拆分试验对目标变化的在线反应时间延迟了约 200 毫秒对约 150 毫秒，但也是高度自动化的。与错误获得“近”目标的试验不同，正确获得指示的“远”目标的试验又延迟了约 50 毫秒。我们还观察到手臂肌肉在拆分试验期间跳跃试验潜伏期的非特异性反应。综上所述，我们的结果表明，到达目标的在线选择会自动与选项的空间分布相关联，尽管比重定向到单个目标的延迟更大。与跳跃试验相比，拆分试验对目标变化的在线反应时间延迟了约 200 毫秒对约 150 毫秒，但也是高度自动化的。与错误获得“近”目标的试验不同，正确获得指示的“远”目标的试验又延迟了约 50 毫秒。我们还观察到手臂肌肉在拆分试验期间跳跃试验潜伏期的非特异性反应。综上所述，我们的结果表明，到达目标的在线选择会自动与选项的空间分布相关联，尽管比重定向到单个目标的延迟更大。与跳跃试验相比，拆分试验对目标变化的在线反应时间延迟了约 200 毫秒对约 150 毫秒，但也是高度自动化的。与错误获得“近”目标的试验不同，正确获得指示的“远”目标的试验又延迟了约 50 毫秒。我们还观察到手臂肌肉在拆分试验期间跳跃试验潜伏期的非特异性反应。综上所述，我们的结果表明，到达目标的在线选择会自动与选项的空间分布相关联，尽管比重定向到单个目标的延迟更大。目标被延迟了大约 50 毫秒，不像那些错误地获得“近”目标的人。我们还观察到手臂肌肉在拆分试验期间跳跃试验潜伏期的非特异性反应。综上所述，我们的结果表明，到达目标的在线选择会自动与选项的空间分布相关联，尽管比重定向到单个目标的延迟更大。目标被延迟了大约 50 毫秒，不像那些错误地获得“近”目标的人。我们还观察到手臂肌肉在拆分试验期间跳跃试验潜伏期的非特异性反应。综上所述，我们的结果表明，到达目标的在线选择会自动与选项的空间分布相关联，尽管比重定向到单个目标的延迟更大。