For me it feels like I can recognize the difference in a way similar to when a computer is just not processing something. Like when you're waiting for an email to be sent and it's just not sending. I can recognize that some places in my head just aren't working.

In terms of coming in and out of worlds, I only feel that I am living in this new world that a product of my concussion. I don't feel like I can't join others, but I do feel like others can not join me; in that I do know that they don't know or perceive or understand the difference in my illness, since having an concussion, other than the obvious symptoms which also involve alienation (need for sleep and quiet) is rather difficult to see from the outside in.