1、One theory is that children and adults with hyperactivity have an abnormality in the shape of the receptor molecules on the surface of the nerve cells to which the transmitters attach themselves.
2、It’s likely in part a biologically based brain disorder, and there may even be a perceptualabnormality, some kind of fundamental visual processing problem.
某种程度上说，它一种生物性的大脑异常，甚至可能有认知的异常，一种基础的视觉加工过程的障碍。
3、Inherited genetic abnormality: Some people are born with an abnormal gene passed on by aparent.
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