The brain as recognition system is organised by the domains that it recognises. The domains that it recognises are both ouside and inside the body. The outside, which can include the meaningful expressions of others, is recognised via sensory sheets which detect external difference. The inside includes domains both outside and inside the brain. Outside the brain includes the musculo-skeletal system, which it detects via the peripheral nervous system, and homeostatic systems, to which it is connected via the limbic system. Inside the brain includes all the processes involved in recognising domains both inside the body but outside the brain and outside the body — an ability that varies across animal species.
The recognition process, as the selection of variants by the domains being recognised, can be understood as the brain adapting to those domains: to the ecological context of the body (which includes the behaviours of other bodies), to the somatic context of the brain, and to the brain’s own recognition processes. Just as “Nature” selects genetic potential-for-development in the evolution of a species, “Nature” selects neurological potential-for-behaviour in the evolution of a neurological system embedded in the body of an organism in its lifetime.