Answer:
Let's consider an analogy.
The Human body and the computer:
The brain can be compared to the CPU of a computer. The Skeletal muscular system would then be the equivalent of the key board.
The Skeletal muscular system is the one and only part of the human body that we can feel and control.
In a computer, does the key board controls the CPU or the CPU controls the key board? For the manufacturer, one controls the other. He has to improve both so that the interaction between the two becomes easier and more reliable.
However, according to the user it is the key board that controls the CPU. In fact, he need not even have to know that the computer has a CPU.
The brain can't be improved. We can only make the best use of what we have got.
What is 'I' anatomically?
What is the 'You' we are talking about? Lets consider its first person equivalent, 'I'. What is this 'I' anatomically?
All the skeletal muscles of the body can contract and relax isometrically as a single unit called Unified Skeletal Muscle, popularly known as the mind. This can contract voluntarily (under our control) or involuntarily (On its own). As default, the voluntary part is trapped between two layers of involuntary parts.
This voluntary part of the Unified Skeletal Muscle or Mind is what we call 'I'. The involuntary part is what we call Self.
What controls the brain?
Under normal conditions it is the 'I' that controls our entire life through the brain, the brain playing a very passive role. In fact, we need not even have to know that we have a brain to use the brain.