By the term "learn", I'd take that as the the ability to absorb, understand, store, then re-use information on a process, fact or concept. If that's the case, then it's huuuugely dependent on the subject matter for me: If the subject in question floats by boat to the right degree, then I take the required information in very quickly, without a good deal of effort, and it will stay there. An example would be hearing a song I like and then replicating it on my guitar....From The Ramones to Segovia - The level of complexity wouldn't phase me. If the subject to be learned was something about which I could not muster an ounce of interest let's say politics, then I may as well as try nailing water to a wall. More concisely, and less Aspergically put, I'd say learning is proportional to degree of intrinsic interest.
P.S
Some say that a sign of Asperger syndrome, is a very flowery, verbose way of talking/writing.....Personally, I don't agree...