There is usually not any confusion. You may hear sound when you see something, but you don't usually confuse those sounds with actual sounds. They therefore are not hallucinations, or delusions, but illusions, or imagary. I get it when I insist on keeping going, even though I am really fatiqued. However when I am alert like I am now, I have trouble remembering what exactly I perceived, when I was fatigued. When fatigued, I remember the last time I was fatiqued, and what synethesia happened then. I had it even before my brain injury. It is sort of like automatic involuntary imagination. My bet is that since we don't talk about it much at all, the truth is that most or all people have it at times, as Avalon pointed out -- but many simply don't remember it later. What we remember is what we go back to, re-think, verbalize and reberbalize. So things we don't talk about much, we tend not to remember -- unless we perceive an important reason for remembering them. But a little quirk of perception like this -- it is not that improtant that we remember it. It doesn't interfere usually with perceiving what is going on. I'm a really into going to extra lengths to remember things, that most people don't go to -- so I remember having it.<br><br><br><br>
I think it's perfectly <i>nawurlmul</i>.