Wilke J T, Sheeley E M
Cortex. 1979 Dec;15(4):561-9. doi: 10.1016/s0010-9452(79)80045-3.
Right handed, left handed, and "ambiguous" male and female subjects performed circular index finger movements. Analysis of preferred direction of movements showed that strong right handers tend to move both left and right index fingers in the same direction, and familial left handers tend to move them in opposite directions. Since right handers tend to possess a strongly dominant left hemisphere, while familial left handers exhibit a high degree of cerebral lateral equipotentiality, the result indicates that interhemispheric interference in a motor skill consists of activation of inappropriate muscles of the non-preferred hand by the dominant ipsilateral hemisphere as its attempts to force that hand to conform to the direction of movement preferred by the dominant hand.
右利手、左利手以及“不确定”的男性和女性受试者进行了食指画圈运动。对运动偏好方向的分析表明，强右利手者往往会使左右食指朝同一方向运动，而家族性左利手者则倾向于使它们朝相反方向运动。由于右利手者往往具有高度占优势的左半球，而家族性左利手者表现出高度的大脑两侧等势性，结果表明，运动技能中的半球间干扰包括优势同侧半球激活非优势手的不适当肌肉，因为它试图迫使该手顺应优势手偏好的运动方向。
