Subject: Why do we perceive virtual reality as if it were real?

First of all I want to thank you, you've helped me a lot. I'm hoping you 
can give me a hand in this question.
I was wondering, how come our head makes us feel as if virtual reality was 
real. I have an idea of what virtual reality is but I'm not sure.
I wanted to know what happens inside our brains that transform this 
technological divice into something that we think we can touch, but is 
actually a plain screen. 
If you know even were I can get this type of information, I would really 
appreciate it if you would tell me. Thanx again...  

Re: Why do we perceive virtual reality as if it were real?