The Radial Arm-Maze has been used extensively in evaluating spatial learning and memory. The apparatus consists of eight (or 12) equidistantly-spaced arms radiating from a small circular central platform. The design ensures that after checking for food at the end of each arm the rat is forced to return to the central platform before making another choice. The rat always has eight (or 12) possible options. Braintree避难所小屋II 一个舒适，安静的地方休息，或爬上去探索。切碎的材料（只是为了娱乐或筑巢），通常需要7至30天。直径4英寸x高2英寸，带有3个大窗户和更宽的门，可提供更安全的出入口。较大的孔还使工作人员可以轻松地将垃圾放在庇护所内，以观察它们。