Thanks Whistles and BillyMac for the sharing of your insight. And another thing that happens in relation to this is: when a player actually does an "inadvertent" high dribble, then I've observed the player to: pause, look at me, and just shake his head b/c he's upset with himself, then either drop the ball (thinking that it's a turnover) or make a motion towards me and hand me the ball---after which I pop my whistle and call "travelling" on him. This high-dribble is something of a violation that is acknowledged and penalized when playing 'pick up" basketball games. So, I guess I can see how the "high dribble" became conflated with "carrying".