They maintain concentration on the character's thoughts and feelings, which they reveal through public actions.
Much of the instruction was about maintaining concentration in long scenes.
We need constant reminders and constant work that you have to maintain concentration and earn the right to win.
Still, just maintaining concentration in this episodic 40-minute sonata, as Ms. Cooper did throughout her sensitive performance, requires a subtler kind of virtuosity.
As a result, research tells us, modern children find it harder to maintain concentration, self-regulate behaviour and develop appropriate levels of empathy.
The hardest part of the job, he said, was maintaining concentration when so many fashionable women walked nonstop past the shop's open garage door in nice weather.
The multi-faceted Tore Andre Flo looks unstoppable in attack, and Gustavo Poyet will pillage his usual bounty if Southampton's midfield fail to maintain concentration.
But I was being jostled, the floodlights blinded me as it dropped out the sky and, to be honest, it's hard to maintain concentration when you've had no saves to make for the previous 36 years.
Joan Vickers, a professor of kinesiology at the University of Calgary, refers to this as "quiet eye": maintaining concentration in the face of onrushing players and 100-mile-an-hour slap shots.
Not many want to stand at the back and put their face in front of the ball to stop a goal, or can maintain concentration for long periods without the ball.
