So the cell on the left, you can see, it fires whenever the animal gets near to a wall or a boundary to the east, whether it's the edge or the wall of a square box or the circular wall of the circular box or even the drop at the edge of a table, which the animals are running around.
这里左边的细胞，你可以看出， 当老鼠向东靠近边界或屏障时， 该细胞都会作出反应， 不论这边界是一个方盒的边 还是一个圆柱盒的边 甚至是老鼠绕着转的桌布的垂帘。