In who much I given, much is expected.. .
This may be a Bible quote but it applies here on the topic of PAT.
When one is praised much is given as reward for good behavior and in return for what that is given the receiver of such praise tend to behave more better and continue to do so.
Continuous praise keeps the cycle going and in no distant time the person will incalcate the habit of good behavior.
RE: Praise Appreciation Time (PAT)