The part of the brain that is associated with speaking and writing is the frontal lobe. This area is also responsible for movement, reasoning judgment, planning and problem solving. The parietal lobe is also important in writing. This part of the brain interprets words and language. Patients with damage in this part of their brain often have trouble spelling and writing by hand. When you are writing something down with a pen and paper, you are stimulating collection of cells in the base of your brain known as the reticular activating system. The RAS is the filter for all the information your brain needs for process and it gives more attention to what you are correctly focusing on. The physical act of writing brings the information to the forefront and triggers your brain to pay close attention.