Maybe you lot can help me with this. I'll describe a certain way that I think, and you tell me what function (or even combination of functions) you think is behind it.
I am very good at finding things that I have lost (which is good, because I lose things all the damn time). I'm good at finding things because I can close my eyes (or stare unfocused into space with either a blank face or a slight scowl), start at any point in time of a given day, and reenact in a sort of fast-forward everything I did that day, everywhere I went, all of the conversations I had, etc. It's not as though I make a conscious effort to remember, I'm just sort of always set to record. But, it has to be something in my direct line of interaction: for example, I'm not going to remember that random dude standing on the corner as I walked by because I was busy talking to my friend, but I will remember every word of the conversation. It's irritating when someone tries to help me find my lost thing by asking me questions to jog my memory because the playback tends to be linear and having to listen to them and split off my thought process to answer them while I'm immersed in the playback is very distracting.
Also, I think in 3D. I can look at a thing, take apart the pieces in my head, and figure out how to put them back together again. It's not quite 3D, really, I guess -- I can see it from all angles at once because it's in muh brainz, but in my head they look almost as real and solid as they do in front of my. (As a side note, when I was little I genuine had trouble telling what was a dream from what was a memory because my dreams tend to be incredibly solid and real. My imagination is intensely detailed.) I love backwards engineering things; a favorite hobby at the moment is looking at a chainmaille weave and figuring out how to make it without looking at a tutorial. It's like a fun brain exercise.
It's not just with physical things, either. I'm good at back-tracking problems and puzzling things out in general. I'm a trouble-shooter. If something breaks, whether it's a computer or an object, or I have to track something down because of someone else's mistake, or even if there's been a miscommunication and we're figuring out where exactly the break in comprehension happened, rooting out the problem using the skills mentioned above is something I've been able to do since I was a kid.
Now, tell me. What function is that? Or is it multiple functions working together? Which ones do you think they are?