When you write on the blackboard, you use much larger movements than when you write in a notebook. Yet, the large letters written on the blackboard will appear very similar to the small letters written in the notebook. How does your brain generate these different writing movements? Does it use a single set of commands for both the notebook and blackboard—or multiple commands? In this article, we will present an experiment in which we measured brain activations of people while they were writing letters of different sizes and discuss what we can learn from this experiment about the brain commands that generate these movements.
Humans have a remarkable range of movements. We walk, dance, write, type, speak, and play different sports, without thinking too much about how we move. We can also perform the same actions using large or small movements, such as when taking a small or a large step, and using slow or fast movements, such as when typing a text message when you are in a hurry. But how does the brain control these diverse movements?

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Go to source: https://kids.frontiersin.org/article/10.3389/frym.2018.00018