Neurons in the brain

Consciousness appears to arise naturally as a result of a brain maximizing its information content. So says a group of scientists in Canada and France, which has studied how the electrical activity in people’s brains varies according to individuals’ conscious states. The researchers find that normal waking states are associated with maximum values of what they call a brain’s “entropy”.
http://physicsworld.com/cws/article/news/2016/oct/18/consciousness-is-tied-to-entropy-say-researchers