Flowers K
Br J Psychol. 1975 Feb;66(1):39-52. doi: 10.1111/j.2044-8295.1975.tb01438.x.
Subjects classified according to degree of hand perference were tested with both hands on two tasks of controlled movement. Strongly lateralized subjects (both left- and right-handers) showed greater skill with their better hand than ambilaterals on a visually controlled aiming test (faster speed and equal errors), but there was no marked differences between groups with the other hand. Between-hand differences were also greater in lateralized subjects. On a ballistic rhythmical tapping test, no marked differences in speed were found, but ambilaterals made slightly fewer errors with the better hand. It is argued (i) that for ballistic movements the hands are equipotential, and skill is a direct function of practice, (ii) that the essential dexterity difference between the preferred and non-preferred hands is in the sensory or feedback control of movements rather than in motor function per se, and (iii) ambilaterals, especially those with very mixed preferences, have virtually two non-preferred hands in continuously controlled movement tasks, and may therefore reply on ballistic movements more than do pronounced sinistrals and dextrals.
根据用手偏好程度分类的受试者，双手接受了两项受控运动任务的测试。在视觉控制的瞄准测试中（速度更快且错误相同），强烈偏侧化的受试者（包括左撇子和右撇子）用优势手表现出比双侧手型者更高的技能，但用另一只手时两组之间没有明显差异。偏侧化受试者的双手之间差异也更大。在弹道式节奏敲击测试中，未发现速度有明显差异，但双侧手型者用优势手犯错略少。有人认为：（i）对于弹道式运动，双手具有同等潜力，技能是练习的直接函数；（ii）优势手和非优势手之间的本质灵巧差异在于运动的感觉或反馈控制，而非运动功能本身；（iii）双侧手型者，尤其是那些偏好非常混合的人，在连续控制运动任务中实际上有两只非优势手，因此可能比明显的左撇子和右撇子更依赖弹道式运动。
