No one knows when exactly it started. When the ancient human beings started to communicate on a higher level than other animals. We do know that they painted on cave walls. From these, we can gather that they wanted to pass on their knowledge and experiences to the next generation and other generations to come. This primitive man that could not have the wildest idea on how humans would progress already knew then the importance of communicating and sharing.
Every so often, I get emails from people who have loved ones who have just suffered a stroke and were in a state of Locked-In.