These tics can be simple, for example barely noticeable eye blinks, as well as complex, like compulsively producing really distracting gestures.

抽动可以是简单抽动，如仅仅是异常的眨眼；也可以是复杂抽动，如强迫性地做出引人注目的奇怪动作。

I also ask them to, meanwhile, stare at the center of a computer monitor to avoid too much eye movements and eye blinks.

我还让他们盯着电脑中央，以避免过多的眼球转动及眨眼。

Simple tics are relatively short in duration, lasting milliseconds, and can include behaviors like eye blinks, which would be motor, or throat clearing, which would be verbal.

简单抽动过程较短，仅数毫秒：可以是动作性抽动，如眨眼睛，也可以是发声性抽动，如清嗓子。