Studying the brain is not enough. The brain itself is merely the vehicle through which consciousness expresses itself. And if one area of the brain is destroyed, other parts of the brain will be recruited to make up for this loss. If the whole brain is destroyed the human may not have physical awareness but could still have cosmic consciousness.
Cosmic consciousness is something that Science has tried to approach through recording the brain waves of devoted meditators and observing the pattern of the calming, ecstatic and deeply reverential Alpha wave state. But just measuring and recording Alpha waves is still missing the point of the essence of cosmic consciousness.
All we can do is listen to the ones who have achieved this state of consciousness. You will feel it when the words they speak ring true to you. Or, they may not even speak. Sri Ramana Maharshi held all his classes in silence for many years. People came from miles around to feel the cosmic consciousness in his presence. Can any instrument measure or record such a phenomenon? No. Therefore, it is beyond Science.