Have you ever noticed that you always brush your teeth, pour your coffee, or unlock your phone with the same hand?

Your choice of left or right handedness is more than just a habit. It reflects how your brain is wired. What’s true for humans is also true for animals that show a paw preference when they reach for food. This is known in scientific terms as limb dominance.

This seemingly simple behavior of left or right limb dominance may hold important clues about how your brain is organized, how diseases affect it, and even how we might diagnose and treat brain disorders earlier. Paw preference in a rat model is equivalent to human left or right handedness, or limb dominance. Many brain disorders, including Parkinson’s disease, Huntington’s disease, stroke, multiple sclerosis, and epileps

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