How are reflexes making the work of brains lighter?

When some simple actions like how to move joints are transferred out of the brain. That thing releases brain capacity for some other things. If that thing is stored only in our brains, we must focus all our attention on things like walking all the time. Things like movement tracks of joints stored near the joints allow. That people can make something else than just walk. 

Reflexes of animals are mechanical. The effect activates the memory blocks in cells. That allows hands and other body parts to act a certain way in certain situations. When the nervous system sends commands to a certain finger it just says "left thumb move". 

When the message faces the neural bud. Some neurons are controlling the left thumb. Those neurons know how to move the left thumb. That neural structure where the memories of how to move some joints

Those memories are stored near those joints making reflexes possible. In reflexes the neural track that transfers information shorter.  When a person falls the brain is sending information about that thing everywhere in the nervous system. And there are the neurons that are handling this kind of emergency that are moving joints in the same way. 

This kind of decentralized computing ability means that there is no need to use brains all the time. And that thing allows us to think about other things when we are walking. If we would not have reflexes we must think about the movements of the feet all the time. 

In the case of the robots, the system will send messages to all subprocessors. Every servo-engine in that entirety is the microprocessor. That microprocessor knows what joint it moves. That thing makes it possible to release mechanical functions to other subsystems. And that releases resources from the central computer.