> Being physically injured like spraining an ankle is so mentally fatiguing because the brains autopilot modes get temporarily disrupted. It can’t use all its gpu bandwidth and has to switch on other processes to move about.

Ohhhh... this explains so much about why what are otherwise mild injuries can absolutely throw off my rhythm and disrupt my productivity. Having even a low-grade injury ties up cycles and is like a background task set to prevent going into power-save mode, because it's like a constant potential threat/alert.