What does reinforcement mean?
Reinforcement
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As stated earlier in this article, a variable ratio schedule yields reinforcement after the emission of an unpredictable number of responses.  This schedule typically generates rapid, persistent responding. Slot machines pay off on a variable ratio schedule, and they produce just this sort of persistent lever-pulling behavior in gamblers.  Because the machines are programmed to pay out less money than they take in, the persistent slot-machine user invariably loses in the long run.  Slots machines, and thus variable ratio reinforcement, have often been blamed as a factor underlying gambling addiction.[44]