Does the brain get tired from intellectual work? Well, if we look at the question from a purely technical point of view, no. The composition of the blood flowing through the brain doesn't change during mental work. Our "decision-making center" is not like a muscle🙌🏻. However, in the process of intellectual work, the brain actively consumes fuel - glucose. And when the "wood for the fire" is no longer enough, we begin to experience exhaustion. Reduced glucose levels cause ATP levels to rise, which blocks dopamine (the hormone that makes us feel good and keeps us motivated). However, after a while our brain automates any activity and it begins to require less and less energy. For example, if you get to work the same way every day, this activity will consume less energy. This also works with the development of COGNITIVE FUNCTIONS!