Johnson O, Kozma A
Cortex. 1977 Mar;13(1):11-6. doi: 10.1016/s0010-9452(77)80049-x.
Subjects balanced a dowel rod on the right or left index finger while speaking, while remaining silent, and while humming a melody. In males balancing times for the right hand decreased with concurrent verbalization. Verbalization had no effect on left hand performance in males, nor on either hand in females. Concurrent humming had no effect on performance of males or females. Poorer right hand performance by males when verbalizing is attributed to interference with right-sided motor control by the left hemisphere due to verbal activity programmed by the same hemisphere. Unimpaired right hand performance in verbalizing females suggests that the language function is less clearly lateralized in females than in males. The possibility that music may be shared by both hemispheres is discussed.
受试者在说话、保持沉默以及哼唱旋律时，将一根木杆平衡在右手或左手食指上。在男性中，右手的平衡时间随着同时说话而减少。说话对男性左手的表现没有影响，对女性的两只手也没有影响。同时哼唱对男性或女性的表现没有影响。男性说话时右手表现较差，这归因于同一半球进行的语言活动对左半球右侧运动控制的干扰。说话的女性右手表现未受影响，这表明女性的语言功能比男性的定位不那么明显。文中还讨论了音乐可能由两个半球共同参与的可能性。
