translation.en: Optogenetics gave us this light switch that we can use to turn brain cells on or off, and the name of that switch is channelrhodopsin, seen here as these green dots attached to this brain cell.
translation.zh: 通过光遗传学我们得到了这个“光开关” 来开启或关闭脑细胞， 这个开关就叫做光敏感通道， 也就是这里显示的附于这个脑细胞的绿色小点。