Department of Neurology, University Hospital, University of Cologne, Cologne, Germany.
Clin Neurophysiol. 2010 Mar;121(3):402-7. doi: 10.1016/j.clinph.2009.11.010. Epub 2009 Dec 9.
To investigate the mechanisms underlying the intermanual transfer of sensorimotor memory when lifting an object.
Twenty healthy subjects grasped and lifted an object with constant mechanical properties with the right hand (RH) first and then with the left hand (LH). Ten of the subjects lifted the object with the RH in a regular wrist angulation (WA), followed by lifts with the LH in a regular WA. The remaining 10 subjects lifted the object with the RH in a hyper-flexed WA, followed by lifts with the LH in a regular WA.
Subjects generated greater peak grip force (GF) rates, grip and lift forces when lifting the object with the wrist in a regular WA compared to lifts with the wrist in hyper-flexion. Importantly, subjects transferred the predictive scaling of GF from the RH to the LH, regardless of the WA.
Biomechanical properties of the object do not seem to be used by the CNS as a first line information to evaluate GF when handling an object or transferring information about the grasp to the opposite hemisphere.
The predictive scaling of GF rather reflects an internal sense of effort than an internal representation of the mechanical object properties.
探究在提起物体时手间感觉运动记忆转移的机制。
20 名健康受试者首先用右手（RH）抓握并提起具有恒定机械特性的物体，然后再用左手（LH）抓握提起。其中 10 名受试者在 RH 处于常规腕关节角度（WA）的情况下提起物体，然后在 LH 处于常规 WA 的情况下提起。剩下的 10 名受试者在 RH 处于过度弯曲 WA 的情况下提起物体，然后在 LH 处于常规 WA 的情况下提起。
与在腕关节过度弯曲时相比，当手腕处于常规 WA 时，受试者在提起物体时会产生更大的峰值握力（GF）率、握力和提升力。重要的是，无论 WA 如何，受试者都会将 GF 的预测比例从 RH 转移到 LH。
神经中枢似乎不会将物体的生物力学特性作为评估抓握物体时 GF 的首要信息，也不会将有关抓握的信息传递到对侧半球。
GF 的预测比例反映的是一种内在的努力感，而不是对机械物体属性的内在表现。
