Behavioral studies consistently find that subjects move their hand along straight paths despite considerations that suggest reaches should be curved. Literature on this topic makes it clear that the experimentally displayed feedback influences how subjects reach. Could the standard visual feedback, a displayed cursor, explain the lack of path curvature in experimental results? To address this question, we conducted three experiments to examine reach behavior in the absence of the standard visual feedback. In the first experiment, we found significant increases in curvature as visual feedback was progressively extinguished across groups. A second experiment revealed that practiced reaches became curved after the standard visual feedback was removed. A final experiment found that subjects' reaches made before and after a brief display of visual feedback were similar, indicating a preference for specific curved trajectories. Our results suggest that the consistently straight reaches often observed could be due to a bias to move the displayed cursor straight, which when removed reveal subject-specific preferences for reaches that are often curved.

中文翻译：

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计划直接还是偏向如此？视觉反馈对到达动作的影响。

行为研究一致地发现，尽管考虑到伸手不宜弯曲，但受试者却沿着笔直的路径移动手。有关该主题的文献清楚地表明，实验显示的反馈会影响对象的到达方式。标准的视觉反馈（显示的光标）能否解释实验结果中缺少路径曲率？为了解决这个问题，我们进行了三个实验，以在没有标准视觉反馈的情况下检查触及行为。在第一个实验中，我们发现随着各组的视觉反馈逐渐消失，曲率显着增加。第二个实验表明，去除标准的视觉反馈后，练习范围变得弯曲。最终实验发现，短暂显示视觉反馈前后所达到的范围相似，表明偏爱特定的弯曲轨迹。我们的结果表明，经常观察到的连续笔直伸直可能是由于移动显示的光标笔直而产生的，这在删除光标时会显示出特定于对​​象的偏爱，通常是弯曲的伸直。