It is interesting that the corpus callosum, the heavy strand of fiber tracts which most immediately connect the cortices of the two hemispheres, is not essential for the acquisition of speech.

• 有趣的是胼胝体，这个含有大串的神经纤维是最直接地连结左右脑大脑皮质的道路，但对口语的习得却不是必要的。