The brain can be split into two parts- the frontal brain and the posterior brain. The posterior brain is the instinctive brain which we have inherited. The frontal brain is the seat of total consciousness. When you breathe without awareness, the breath is registered in the posterior brain, but when you are aware that you are breathing and you are consciously witnessing the whole process, then it is registered by the conscious brain, the frontal brain. This difference seems to be very simple, but its effect is very great. Throughout life, you breathe unconsciously, just like animals, children and most other people do, excepting for the few who have started practicing yoga. Now, in every case, the pranic flow is being registered in the posterior brain as if in a computer. The moment you become aware of your breathing and you begin to conduct and control the breath in a particular fashion, immediately the frontal brain registers the influence.