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The hippocampus, a brain region important for forming memories linked to specific places and contexts, produces new neurons daily in an area called the dentate gyrus.

One of the most striking findings were in cells of the dentate gyrus, where the researchers detected an important reduction of the expression of Snhg11.

Most lost are dentate gyrus neuroblasts, which are essential for creating neurons in the hippocampus, a region linked to memory and diseases like Alzheimer's.

The mice that spent time running and playing showed evidence of neurogenesis in an area of the brain called the dentate gyrus of the hippocampus.

Specifically, the "dentate gyrus" — the part of the brain that's responsible for forming memories, and critical in learning — decreased by 7 percent.