What function am I using here?

Often times (in fact, all of the time I'm not actively concentrating) I'll daydream and live out a possible future experience, it's usually related to something that's happened (where the event could lead to), something I'm thinking of doing, or something I wish I could do. Long, elaborate stories can emerge on their own from this (and many times I've used them for creative inspiration)

It's kind of like watching a TV show with no sound most of the time, I guess it's kind of like I'm listening to the white noise of my mind, but it's more concrete than that.

I mean, I get that I'm just daydreaming, but I'm wondering if the type of daydreaming I'm doing is related to any function in particular.