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1·Feig and colleagues raised mice, some in plain cases with wood chips and others in enriched cages with boxes, a running wheel, toys, and constant rearrangements of nesting material.

菲格及其同事分别在装有木屑的普通盒子和放有盒子、飞轮和玩具等物品的“高级”笼子中培育两组幼鼠。在后一个环境中，研究人员还不停地变换物品的摆放。