It’s a really weird thing.
In the process of learning something on guitar, specifically when I’m dealing with particularly tricky fingerwork, I’ll hit a point when I just can’t get my fingers moving fast enough, or to the right notes, or with the fluidity and rhythm needed for the song.
It’s that situation when the mind knows what to do, but the body can’t translate. Time after time, I’ll try but I’ll miss this note or I’ll flub that one.