It only changes its circuit.
While the brain is registering sensations, the four dynamic centers are coming into perfect relation.

Or rather, as we see, the reverse is the case.

As the dynamic centers come into perfect relation, the mind registers and remembers sensations, and begins consciously to know.
But the great field of activity is still and always the dynamic field.
When a child learns to walk, it learns almost entirely from the solar plexus and the lumbar ganglion, the cardiac plexus and the thoracic ganglion balancing the upper body.
There is a perfected circuit of polarity.

The two lower centers are the positive, the two upper the negative poles.

And so the child strikes out with his feet for the earth, presses, and strikes away again from the earth, the two upper centers meanwhile corresponding implicitly in the balance of the upper body.