I don't agree it's a "nervous tic". That suggests it's completely involuntary.
Whereas I think he does it on purpose, in order to mask the embarrassing reality of his own limited ineffective contribution.
The only person I can recall doing similar was Xabi. And even then it was usually Djimi Traore on the receiving end of such 'guidance'. I don't think I need to point out the contrast.
Xabi was doing it in the second half in Istanbul every time Djimi got the ball. The lad had been a wreck in the first '45 and the trauma had been sufficient to clear his memory banks of how to play any kind of football, even Djimi-football. In a way it helped Liverpool since he then became a willing extension of Xabi Alonso's thought processes. Must have been exhausting for Alonso, but it helped see us through.
Jay's is a tic though. It's got to be. It's the same involuntary spasm that sees him put both arms stiff down his sides with palms open when he's running. The gesture is meant to say 'Someone make themselves available for a pass', but what it really says is 'Panic! Panic! I don't know what to do'.
And just to complete the repetoire. Anyone like him raising both hands in the air, standing absolutely still and calling for the ball when there are about five opponents in between him and the man on it?
But should you want to torment yourself there's a lovely example yo be seen about 15 minutes into the Toronto game.