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Something happens when a rat starts running. Not just the obvious things, the faster heart, the warming muscles, the rhythmic percussion of paws against the wheel. Something quieter. Something that begins in the coiled darkness of the gut and travels, through blood and biochemistry, all the way to the memory-work-in-the-human-brain/” title=”How Does … Work in the Human Brain?”>hippocampus, that seahorse-shaped sliver of tissue where memories form and moods take root. A study published in Brain Medicine has begun to map that hidden journey, and what the researchers found suggests that exercise stimulates a molecular link between gut bacteria and the brain.