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I can only speak as an animal behaviourist, but I think the answer is in the question.
A positive reinforcer by the very nature of it reinforces behaviour. A variable schedule is the most powerful over the longterm because it produces behaviour which is highly resistant to extinction. Hence gambling addictions!
@Hamidarvand VR? Variable Ratio (of reinforcement)? Or something else entirely?
ADHD. Puppies. Star Trek. Linux. Science. Shiny things.