Have you heard before the concept of NEPOPO?
NEPOPO®: This is a method developed by renowned trainer Bart Bellon, using negative reinforcement together with positive reinforcement. It is an extremely effective method of training and uses very low levels of electric collar stimulation applied as a command is given (-ve NE), the stimulation is continued until the dog performs the behaviour (+ve PO), once the behaviour is performed, the dog is rewarded (+ve PO). So the dog is essentially reinforced twice for the behaviour, once by the cessation of the stimulation, and then again by the reward.
Let me know what you think about this Concept.