The present study aimed at examining the effect of mental calculation and number comparison on motor performance measured as the movement time of a fast manual-pointing movement. Three experiments, involving a total number of 65 undergraduate subjects, examined the effect of mental subtraction (complex) and, respectively, of (a) mental addition (simple or complex), (b) mental multiplication (simple or complex), and (c) the comparison of dot sets and number comparison. Each number was written in Arabic. The movement times were analyzed by using a multilevel linear mixed-effect model. The results showed significant improvement of manual-pointing movement performance only after the complex calculations and after number comparison. Possible implication of attentional mechanisms specific to this arithmetical activity is further discussed.

本研究旨在检验心理计算和数字比较对以快速手动指向运动的运动时间测量的运动表现的影响。涉及总共65名本科生的三个实验分别研究了智力减法（复杂）和（a）智力加法（简单或复杂），（b）智力增倍（简单或复杂）和（ c）点集比较和数字比较。每个数字都是用阿拉伯语写的。通过使用多级线性混合效应模型分析运动时间。结果表明，只有经过复杂的计算和数量比较之后，手动指向运动的性能才会显着改善。进一步讨论了此算术活动专用的注意机制的可能含义。