Narrowing the target down to the right house in the tectum requires a second step , but scientists do not understand this process in detail 要确定是顶盖城市里的哪栋房子，还需要第二个步骤，但科学家还不知道详细过程。
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This fact led me to speculate that an axon could find its retinal cell neighbors in the tectum by homing in on chemical scents released by active tectal neurons , because its neighbors were most likely at the source of this trail 这让我怀疑，轴突是否可以藉著活跃的顶盖神经元释出的化学物质，找到顶盖里的视网膜细胞邻居，因为它的邻居最有可能就在这条路的起点。
