Sleep is divided into REM and four stages of non-REM; each has a distinct brain wave frequency.
睡眠过程可分为快速眼动阶段和四个非快速眼动阶段，每个阶段的脑波频率都不一样。
A new study published in the Journal of the American Medical Association has found that the radio frequency waves emitted from mobile phones demonstrably alter brain wave activity.
在美国医学学会期刊上发表的一项最新研究发现手机发射的无线电波能明显地改变脑细胞活动。
Between three subtypes of ADHD, brain wave frequency of HI type was the slowest, of the PI type was the fastest(P<0.01).
三个亚型ADHD患儿中HI型脑电频率最慢，PI型频率最快，三个亚型间两两比较差异有非常显著性（P<0.01）。
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