ShiroKuro obviously, there's a good bit that's memorized. But it's also not "memorized," because I can't play without the score.
I think for people who don't memorize, this kind of reading must be different from the way memorizers read, and also the memory we have of pieces we know well, but play from the score, is also somehow different from a memorizer's "memorized piece."
if that makes sense?
I'm curious what other habitual readers, like @twocats , think about this.
I think for me learning a score is essentially getting it into my "finger memory" so that I don't have to struggle. But the "note memory" doesn't exist at all-- as I'd mentioned, I'd have trouble even telling you what note a piece starts on even if I can play it well.
ShiroKuro But if we're reading while playing, there is necessarily going to be some amount of "cognitive burden," some amount or our attention taken up from reading, even for comfortable readers. So I think one key point of this thread (not to put words into @twocats 's mouth)... is that, for those of us who are habitual readers, what can we gain from memorizing. And I think this idea that, if we memorize and are therefore not reading the score, we will be freed up, our attention will be freed up, to focus more on other things... so it's not that we're not listening to tone while reading, but the idea anyway, is that we could listen more closely or fully if we memorize....
Actually I think having the score removes that cognitive burden for me! I literally don't have to think about a piece that's not difficult to read (the notes translate directly into my fingers), and have occasionally watched TV on a tablet with subtitles on while practicing. Reading feels pretty "brainless" for me.
By memorizing, I will definitely engage other parts of my brain. I think initially there will be far more cognitive burden for me to memorize but if I work at it enough to be confident, I think that it'll be a different, deeper, way of experiencing how I play the piece. It's going to be quite a lot of hard work though!