当研究人员在第二和第三晚重复实验室里的实验时，他们发现在深度睡眠时左脑不能以同样的方式受到刺激。
When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.
在研究前期的一年半中，受伤实验主体相比于对照组，其脑额叶前部皮层背外侧更厚，之后，厚度逐渐恢复正常。
During the first year and a half of the study, the trauma subjects also acquired a thicker dorsolateral prefrontal cortex than controls did. After that, though, the thickness gradually normalized.
而之所以研究人员在实验中使用血浆，是因为血细胞较大，无法通过血脑壁障进入大脑。
The researchers used plasma because blood cells are actually too large to travel through the blood-brain barrier into the brain.
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