Background

When performing the clock-drawing test healthy participants often draw the clock face using a counter clockwise movement. The reason for this circular directional bias is not known. These actions may be related to the development of motor or attentional programs that associate leftward with downward movements, and rightward with upward movements.

Methods

To further examine this down-left, up-right programming hypothesis, we examined the direction of circular movements made during cursive writing by dividing the first curved movements into the following pairs, up versus down, and leftward versus rightward.

Results and conclusions

With almost all the letters analyzed, when initially moving upward there was a simultaneous rightward movement and when initially moving downward a leftward movement. The results suggest that there appears to be a relationship between downward and leftward movements as well as between upward and right rightward movements. In addition, there is some evidence to suggest that the right-upward movements may be mediated by the left hemisphere and left-downward movements by the right hemisphere. Although our results suggest motor or spatial attentional programs may account for counter clockwise face drawing, activities such as learned writing direction may influence this spatial bias. Therefore, additional research is needed to better understand if these spatial biases are learned or intrinsic and the neuropsychological mechanisms that might account for these asymmetries.

中文翻译：

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右上-左下

背景

健康的参与者在进行钟表测试时，经常使用逆时针方向画钟面。这种圆形方向偏差的原因尚不清楚。这些动作可能与运动或注意力程序的发展有关，这些运动或注意力程序向左与向下运动相关联，向右与向上运动相关联。

方法

为了进一步检查这种左下，右上编程的假设，我们检查了草书书写期间圆周运动的方向，方法是将第一个弯曲运动分为以下几对，分别是上，下，左，右。

结果与结论

在分析了几乎所有字母后，最初向上移动时同时发生向右移动，而最初向下移动时同时发生向左移动。结果表明，在向下和向左运动之间以及在向上和向右向运动之间似乎存在关系。另外，有一些证据表明，右上运动可能是由左半球介导的，而左下运动是由右半球介导的。尽管我们的结果表明，运动或空间注意程序可能是逆时针面部绘制的原因，但是诸如学习的书写方向之类的活动可能会影响该空间偏差。所以，