Behavioral training uses punishments and rewards in order to extract desired behaviors from the subject in question. Numerous studies support that the use of punishment in children has detrimental effects, regardless of whether or not the punishment is physical in nature. Besides dissolving the connection between parent and child, punishments do not help the child to do better or improve the behavior.
Many parents deem this to mean that they should rely on rewards instead. What they fail to realize, and what research also supports, is that rewards are merely the other side of a two-edged sword.
Read more about why rewards are not the best alternative to punishment at my post today at Natural Parents Network: Rewards: The Other Edge of the Sword.