Teacher Talk:

Whether Giving Instructions, Offering Compliments, or Delivering Discipline, How Teachers Talk Can Make the Difference between Success and Failure

"positive reinforcement is much more than just saying 'Good job!'--that it is a
specific skill used in a specific time and place for a specific purpose. She
added that what he had engaged in, while it sounded positive, was actually a
rhetorical speech pattern that students would eventually tune out--something to
be avoided by teachers at all costs."

Journal article by Keven A. Prusak, Susan D. Vincent, Robert P. Pangrazi; JOPERD--The Journal of Physical Education, Recreation & Dance, Vol. 76, 2005.