Neurons in the brain communicate with each other. Each neuron Can have 1000 connections. In a healthy brain the neurons fire off electrical impulses to communicate with each other. Add in the 5 senses and that's your sense of self. In a way the human race is itself a giant brain with a giant headache. Every human being is like a individual neuron, that communicates with each other through mainly sound (this is changing to electrical and electromagnetic waves). The human species as a brain has memory i.e. history. It has communication, but in a normal brain the neurons mainly do not miss communicate. It is this headache i think we as a species need to overcome to reach our maximum potential.