Bizzi E, Giszter S F, Loeb E, Mussa-Ivaldi F A, Saltiel P
Dept of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139-4307, USA.
Trends Neurosci. 1995 Oct;18(10):442-6. doi: 10.1016/0166-2236(95)94494-p.
The complex 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.
结合脊髓中结构的最新发现，讨论了将手臂运动规划转化为肌肉力量这一复杂问题。这些结构包含一些神经回路，激活后会在肌群中产生精确平衡的收缩。这些协同收缩产生的力量将肢体引向空间中的平衡点。值得注意的是，激活不同脊髓结构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。
