Bizzi E, Saltiel P, Tresch M
Massachusetts Institute of Technology, Department of Brain and Cognitive Sciences, Cambridge 02139-4307, USA.
Z Naturforsch C J Biosci. 1998 Jul-Aug;53(7-8):510-7. doi: 10.1515/znc-1998-7-806.
The issue of translating the planning of arm movements into muscle forces is discussed in relation to the recent discovery of structures in the spinal cord. These structures contain circuitry that, when activated, produce precisely balanced contractions in groups of muscles. These synergistic contractions generate forces that direct the limb toward an equilibrium point in space. Remarkably, the force outputs, produced by activating different spinal-cord structures, sum vectorially. This vectorial combination of motor outputs might be a mechanism for producing a vast repertoire of motor behaviors in a simple manner.
结合最近在脊髓中发现的结构，讨论了将手臂运动计划转化为肌肉力量的问题。这些结构包含一些神经回路，当被激活时，会在肌肉群中产生精确平衡的收缩。这些协同收缩产生的力量会将肢体引向空间中的一个平衡点。值得注意的是，激活不同脊髓结构所产生的力输出会进行矢量相加。这种运动输出的矢量组合可能是一种以简单方式产生大量运动行为的机制。
