I have heard that altering consciousness is a NEED for humans. I even used that statement in arguments about the validity of the psychedelic experience. And recently this idea has been popping up more and more often to my attention. One exapmle is that the very first sentence of the Sam Harris article discussed in the "Drugs and the Meaning of Life" thread states: "Everything we do is for the purpose of altering consciousness." Also recently I found the following article 7 Species That Get High More Than We Do. I'm sure there are more examples of different species in nature altering their consciousness one way or another. But what I want to know is the following. Who was the first person to say that it is a need? Is there any scientific backing of this idea? And do all species have a need to alter their consciouness or is it just some? And if it is not all species then why do some have to alter their consciousness and some don't? These and any other questions that might come up about the need to alter consciousness, I hope we can answer here.