BUT WHY IS THE CENTRAL PART NON MODULAR o 1. Central systems are responsible for belief fixation o2. Belief fixation is isotropic(各向同性的)and Quinean(奎因式的) o 3. Isotropic and quinean processes cannot be carried out by informationally encapsulated systems o Hence. from 2 and 3 o 4. Belief fixation cannot be carried out by an informationally encapsulated system o 5. Modular systems are informationally encapsulated o Hence from 4 and 5 o 6. Belief fixation cannot be carried out by a modular system. o Hence. from 1 and 6 o 7. Central systems are not modularBUT WHY IS THE CENTRAL PART NON￾MODULAR?  1. Central systems are responsible for belief fixation.  2. Belief fixation is isotropic (各向同性的) and Quinean（奎因式的）.  3. Isotropic and Quinean processes cannot be carried out by informationally encapsulated systems.  Hence, from 2 and 3,  4. Belief fixation cannot be carried out by an informationally encapsulated system.  5. Modular systems are informationally encapsulated.  Hence, from 4 and 5,  6. Belief fixation cannot be carried out by a modular system.  Hence, from 1 and 6,  7. Central systems are not modular