Hlushchuk Yevhen, Forss Nina, Hari Riitta
Brain Research Unit of Low Temperature Laboratory, Helsinki University of Technology, Finland.
Neuroimage. 2004 Feb;21(2):696-700. doi: 10.1016/j.neuroimage.2003.09.064.
In area 3b of the monkey primary somatosensory cortex SI, the proximal phalanges of the fingers are represented close to the surface and the fingertips in the depth of the central sulcus. To study whether a similar arrangement might exist in humans, we applied tactile stimuli to the distal and proximal phalanges of the index finger in 11 healthy adults. Cortical somatosensory evoked fields were recorded with a whole-scalp neuromagnetometer. The sources of the responses were situated in the posterior wall of the central sulcus, statistically significantly more superior to proximal than distal stimuli, with a mean difference of 3.1 mm. Thus the distal-to-proximal representation of the index finger shows a similar order in human and monkey SI cortex.
在猕猴初级体感皮层SI的3b区，手指的近节指骨在靠近表面处代表，而指尖则在中央沟深处代表。为了研究人类是否可能存在类似的排列，我们对11名健康成年人的食指远节和近节指骨施加了触觉刺激。用全头神经磁强计记录皮层体感诱发电场。反应源位于中央沟后壁，统计学上近端刺激的反应源比远端刺激的反应源显著更靠上，平均差异为3.1毫米。因此，食指从远端到近端的代表在人类和猕猴SI皮层中显示出相似的顺序。
