The brain is a unique example of an organized and self-organizing in time and space of the biochemical system. In the brain, the activity of enzymes, neurotransmitters and electrical potentials in the region of synaptic membranes and neuron bodies are perfectly synchronized, that is, coherent. In different situations synchronized (coherent) different in the composition of neurotransmitters of the population of neurons. The coherence of different populations of neurons in the brain is constantly changing. Synchronization, consistency, coherence are the conditions for the functioning of a healthy brain. The violation of coherence reflects (and is the cause) the development of pathological process in the brain. Consequently, a basis for diagnosing pathological processes in the brain arises by a precise definition of coherence. On the other hand, specific targets for therapy arise (noncoherent populations of neurons in the brain).

Scientific evidence of a 'higher' state of consciousness has been found in a study led by the University of Sussex.

 Neuroscientists observed a sustained increase in neural signal diversity -- a measure of the complexity of brain activity -- of people under the influence of psychedelic drugs, compared with when they were in a normal waking state.

 The diversity of brain signals provides a mathematical index of the level of consciousness.

 "During the psychedelic state, the electrical activity of the brain is less predictable and less 'integrated' than during normal conscious wakefulness -- as measured by 'global signal diversity'.

 "Since this measure has already shown its value as a measure of 'conscious level', we can say that the psychedelic state appears as a higher 'level' of consciousness than normal -- but only with respect to this specific mathematical measure.”

 I’m still confused.  Synchronization at higher levels of diversity seems consistent with a more complex consciousness, but decreased predictability and integration of electrical activity seems incoherent.  Is this seeming inconsistency due to the mathematical model?  Or is it a matter of semantics?  Should further research be done in order to discover if decreased integration and predictability arise from the limitations of the mathematical model?

I also find it difficult to answer the question about the ability of neural brain populations to exchange information in a few milliseconds. And as a result, we are aware of ourselves and the world around us. But any violation of the conditions of communication is accompanied by a loss of consciousness. However, it is possible to register various forms of electrical brain activity during a loss of consciousness.

Thank you!  Your response is very helpful.