Perhaps on my first LSD trip, which I did before I did any other drugs, including smoking marijuana--even then, I experienced LSD first.
There is no short, or easy way to really explain it. And it took me many more years to correlate the full spectrum.
The mind is a Thinking Apparatus, only able to correlate the contents of its experiences based upon the input of the information it draws in. New information requires Information Processing, which is the slower part of the mind.
--In layman's terms, this means that evolutionarily, we've evolved to leap before we look, and that learning to look before we leap (the development of Critical Thinking) is a developmental process. Or to put it metaphorically: If your windshield is foggy, it's going to limit your visibility, your brain is the windshield, and life is the foggy drive experience. Critical Thinking, is your headlights and high beams.