Most people believe that taking some kind of psychedelic you are effectively altering your brain's chemistry which cause hallucinations. But my question is - what exactly is going on?

Let me start with what is going on NOW:
Right now our brains have active chemical processes and reactions occurring. What is the final result? We're conscious human begins, and what perceive what we believe to be reality. You take a psychedelic, and the brain chemistry changes just so slightly, and your off in another world. So what am I getting at?

What if these hallucinations have a reality that is just as real as our own. And I'm not talking about "the experience is real and that's all that matters". When the brain chemistry is altered to the point that you enter an alternate universe - the brain has effectively completely tuned out our everyday reality. What if it tuned into a different reality... but this reality is connected to our own. Like it's always around us, it's there - we're just not tuned into it. In the same way - if there are actual conscious and real entities there, their reality is not tuned into our physical reality...

What if...

What if there was a way to control perception through the alteration of brain chemistry. For example... take visible light. Visible light is 400-750nm. Anything outside of this, we pretty much cannot see. Now here's a cool fact... if you were to wear glasses... I forget what kind exactly - you could actually very barely see in infrared. That's right - infrared vision, though not much. This is a different wavelength of visible light... problem is our eyes are not very sensitive to it. What if through taking a controlled drug, it could temporarily alter the brains chemistry to ignore all visible light, and only focus in (and magnify) the infrared spectra, causing a human to be able to see in full blown infrared. Something like this would be extremely hard to accomplish if even possible at all. Humans would be the guinea pigs, but it definitely would not be hard to find volunteers. But *if* this was possible, all of a sudden I don't know if I could look at drug induced hallucinations at "just hallucinations" anymore.