So the arrows connect regions that are active at the same time, and the direction of the arrows flows from the region that's active first in time, and the arrowhead goes to the region that's active later.
所以箭头将会同步标记出哪块区域比较活跃 箭头指向的出发点的区域 是最早有大脑活动的区域 箭头所指向的地方则是活动相对较晚的区域