I've often wondered if studied bassists typically know more about the instrument (notes, arps, scale tones, etc.) than guitarists. I'm generalizing here, but a lot of guitarists learn some chords and some minor pentatonic positions and don't learn a whole lot more than that. As a guitarist you can get away with playing a whole lot of music with just that. Since bass is typically charged with playing lines that connect through chords (as opposed to strumming chords) one would assume you need to know more about the instrument to play solid lines. I'm sure there are many bassists who just know the basics and are fine so maybe my point is moot, but this is something I've wondered about. Obviously there are many guitarists who know the instrument up and down, but they're probably in the minority of guitar players.