> The math part of your brain never shouts equations at you

I'm not so sure. When I don't understand something, often mathematical or related concepts, that I want to understand, sometimes it won't let me go. And I wouldn't say that all my internal "calculations" on the topic can be distilled into thoughts.. in fact, that's why I don't understand it. There are symbols "shouting" at me to form a relationship that I don't fully grasp yet. They are more like images, but non-visual.. they don't yet fall into semantic categories that allow me to express them until I understand them, or you could say that when I learn to express them they take on semantic categories. Either way, non-verbal thoughts definitely occupy unexpected parts of my concentration at pretty regular intervals. Not sure that counts as "shouting" but it's maybe similar.