Extinction of a classically conditioned response involves suppression of that response by higher brain centers; the conditioned response can be established again very quickly. The probable mechanism for extinction lies in the path from the ; the probable mechanism for reconditioning lies in the path from the .

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.