When I close my eyes I cannot see anything, just blank. I had been talking to my roommate yesterday about this and he says that he can picture things and people when they are not there.
Today I found a website, dfan.org/visual.html, by someone with a similar experience who described the experience like this:
"Imagine a red square. Can you see it? I can't. I know intellectually what a red square is made of, but I cannot see one unless one is in front of me"
The website made a rough estimate of 1 to 10 percent of people who cannot visualize, but does not know of any scientific research. I am really curious how rare it is to not be able to visualize things and if there has been any research on either the prevalence or the cause of this.
I don't really know how to describe the experience since I have never really been able to visualize anything. Very rarely I will wake up knowing that I have dreamed something but once I am awake I cannot visualize anything. I maybe have one of these nights a year when I think I have had a dream, other times I just fall asleep and then wake up to my alarm. People have always told me that I dream every night, I just can't remember it - but now I am wondering if my lack of dreaming is related to the inability to visualize. The guy on the website I mentioned earlier says he dreams normally, so maybe it is a memory thing? who knows....