I read the one article that said they're "stylized ego packets" and was like "Hun. You're an asshat. You know that? It ain't the intellect that makes em kids."
OMG that was hilarious. I felt the same way reading that. Plus insulted for my littles.
I started becoming co-conscious with my alters in April more or less. When they revealed themselves, they were 100% age appropriate about everything. I started journaling about Jack from the first day he broke through so I have a record of most of what he did, what he thought, how he approached everything and how he grew. At first he didn't seem to understand anything beyond what a 10-year-old awaking from a decades-long coma would. As time passed and I shared the body and spent time with him, he started picking up on my physically learned skills like reading, typing, and handwriting. If I were driving now, I'm sure it would be the same.
How-to stuff and memories seem to be accessed differently. He was sometimes able to "mine" my memories or I would offer him one. For example, Jack didn't know an old roommate who is currently living in my condo but to make him comfortable I explained the roommate was like us. I thought back to a night we were driving around during college in the roommate's beat-up truck, two country boys in the big city. Jack grabbed the memory in his mind. In co-consciousness I was flooded with an experience in the present of my roommate just as he was decades ago. At the time I guessed Jack must have been there with us and it was his memory. But he was just accessing one of my memories in real time, in a more vivid way than I believe I could anymore.
Weeks ago the roommate took Jack hiking. For reasons I'm still not sure about, I went deep inside for about 24 hours that overlapped with the hike. I was very far away and Jack was alone, reduced to the 10-year-old he was. It was the first time the two really talked, so it was awkward. He was uncomfortable around this adult, didn't know what to say, couldn't keep up his end of the conversation, and couldn't figure out what was happening like he could when I was inside but nearby. He was able to access some basic knowledge, facts, but it was as if he couldn't use my part of the mind in order to give the information the context he needed to make sense of it.
The two types of long term memory are declarative and procedural. The former include knowledge and life memories. In my system, these require interpretation so the littles need a lot of help and sometimes can't comprehend meaning even if they can access a piece of information. The latter include physical skills like writing and driving. In my system, alters can learn to access procedural memories faster and easier and I suspect that's common.