颅脑损伤包括外伤，可致，可造成精神异常，或曰 精神病。
据文献（不少）说：
1，毛岸青 有精神病， 具体病名不知。
2，毛岸青 幼少时 在沪 被袭击 击伤头部，（具体伤情，医生诊断和治疗，不知）留下后遗症。
3，毛岸青的精神异常（如果诊断确实）很可能 是后天性的， 继发性的。
脑损伤与精神病大概由于：
1，器质结构改变，
2，通路，线路，circuit 变故，短路，错路，反路等，
3，某些神经介质的产生，输送，结合，分解代谢障碍。
下文是 丹麦医学家科学家 对丹麦近14万人群的调查报告。
这么大规模的试验课题，很罕见，很特殊，很有说服力。智者慧眼自辩。
has taught at many institutions including Harvard Medical School.
Traumatic Brain Injury
颅脑外伤性损害 可以导致精神病发生。童年少年头部外伤者的精神病发病率尤高。
When traumatic brain injuries TBI cause psychiatric symptoms
In 2013, a group of Danish scientists found that individuals with TBI (including concussions) were
four times more likely to develop a mental illness. People who had received a TBI were
颅脑损伤后，精神病的发生率 是 正常人群体的4倍。
65 percent more likely to develop schizophrenia, 精神分裂症 65%
59 percent more likely to develop depression and 抑郁症 59%
28 percent more likely to develop bipolar disorder. 狂躁-抑郁症 28%
This study is the largest of its kind and involved following 1.4 million Danish citizens born between the years 1977 and 2000. ---- 【注：1.4million， 原文如此， 当为 113,906 脑颅受伤者】
详见 ： http://ajp.psychiatryonline.org/doi/abs/10.1176/appi.ajp.2013.13020190?
A head injury, especially a severe head injury or one occurring between the ages of 11 and 15, increased the risk for subsequent schizophrenia by 65%, the risk of depression by 59%, the risk of bipolar disorder by 28%, and the risk of organic mental disorders by more than 400% in this largest-to-date analysis of data from over 100,000 individuals.
-------------------
This study is far from the only one to suggest a link between TBI and mental illness. A research team led by Jonathan Godbout, an associate professor at Ohio State University,found that mice that had sustained a TBI demonstrated increased depressive symptoms as well as higher-than-normal levels of neural inflammation. (I have previously written aboutmental illness’ surprising link to inflammation). Yet another study found that experiencing depressive symptoms after a head injury is more common than not — the prevalence of depression after TBI is greater than 50 percent.
The most frightening piece of research, however, was published earlier this year: People who had received a concussion in the past were three times more likely to fall victim to suicide.
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