Baldissera F, Cavallari P, Civaschi P
Neurosci Lett. 1982 Dec 23;34(1):95-100. doi: 10.1016/0304-3940(82)90098-2.
Single or cyclical voluntary movements of flexion and extension of the hand, performed in a parasagittal plane, are immediately and naturally coupled with the same movements of the foot only if the extremities follow simultaneously the same direction. Instead, great care and attention are required to move the two segments in opposite directions, an association which tends to reverse spontaneously to the 'easy' pattern. This rule is followed independently of the muscles employed, since it holds both when the hand is prone and when it is supine. The same principle also applies to many other couples of voluntary movements of the ipsilateral limbs or of different segments in the same limb.
仅当四肢同时朝着相同方向运动时，在矢状旁平面内进行的手部单一或周期性屈伸自主运动才会立即且自然地与足部的相同运动相耦合。相反，要使两个肢体节段朝相反方向运动则需要格外小心和专注，因为这种组合往往会自发地恢复为“容易”的模式。无论使用何种肌肉，这一规律都会遵循，因为无论是手部处于旋前位还是旋后位时它都适用。同样的原理也适用于同侧肢体或同一肢体不同节段的许多其他自主运动组合。
