"I wouldn't have bought any cheese" is expressed as a deduction (as in the discussion you follow up with) "it's not likely I bought cheese", or "I'm not the sort of person to have bought cheese there".
The pragmatic implication in this sense is either "I don't remember for sure whether I ever bought cheese, but I can't believe I did", or possibly "You must see that I'm not the sort of person to buy cheese there".
The terms
subconscious learning
or
subliminal learning
are essentially the phrases for what you mean - I don't know if there's a better single-word.
(Simply google for literally 10,000s of both Real Scientific mentions of this, and Crass Commercial mentions, trademarks, etc, eg .. http://www.realsubliminal.com/how-subliminal-learning-works http://effortlessenglishclub.com/subconscious-vs-conscious-learning
Finally: I believe there's a lot of research in to issues like "How many hours per day should concert pianists practice?" where the answer is along the lines "surprisingly the hours when you stop practicing and do something else are where you Actually Learn", etc. So perhaps you could pursue that type of field and find some neat terms being used.
Also Chris as I mention in a comment, it's common that (whether today or historically) some famous musicians have taken the point of view that they "never had to learn", were simply "learning something they already new", or "already knew everything as soon as they were about to be taught it." (This can indeed veer to a sort of mystic re-incarnation vibe.)
An example of this from an extremely popular bestseller of the "new-age" era is the actress and musician Leslie Parrish's explanation of her musicality in her boyfriend Richard Bach's bestseller "Bridge across Forever"...
"But there is one funny thing. Music that's no later than Beethoven,
than the early 1800s, it's as if I'm relearning, it's easy, I seem to
know it at first sight. Beethoven, Schubert, Mozart-like meeting old
friends. But not Chopin, not Liszt . . . that's new music to me."
It could be your feeling leans to this? Rather than "scientific" "subconscious learning, let's say.
So, I'm pointing out there's kind of TWO phenomenon along the lines you ask, Chris,
(A) "scientific" for want of a better word, subliminal learning, which you can find studies about and so on
(B) particularly since you mention music, the phenomenon where certain musicians have reported they "already knew it" - which can be a little "new age", if you will.
So, I don't have exact terms for those two, A/B, but I'm just adding that as a kind of clarifier!
For another more specific suggestion (example, http://en.wikipedia.org/wiki/Sleep-learning ) you could possibly use the term
hypnopedia
in a related way. You could say something like:
"It's so weird, I worked with the desk once, months ago, and never
thought about it again. Then today - I'm a master of it with no
further effort. It's like hypnopedia or something!"
(BTW, as always with wiki, I don't know if some idiot just made up "hypnopedia" out of fresh air to make that page look good, or, if it is really used widely.)
Hope it helps!
Best Answer
"I knew [him/her] when" is an idiom in English. It is not about the speaker's age (I knew her when I was young is not an idiom.) It is more about a defining event or series of events in the life (no matter how young) of the person about whom you are speaking. One dictionary defines it as
On May 22, 2007, a video of a young boy and his younger brother was uploaded to YouTube. The young boy (Harry Davies-Carr) is holding his little brother Charlie on his lap. Harry explains that Charlie bit him, and puts his finger in Charlie's mouth to demonstrate. Charlie bites him again, to no one's surprise. Only this time it hurts!
The video went viral, and has been seen over 720 million times. Harry and Charlie became minor celebrities. Though Harry was a young child when the video was uploaded, anyone who knew Harry and Charlie before the video went viral can rightfully claim:
The video is really cute. If you haven't seen it, do watch it.