A reinforcement schedule where rewards are delivered after an unpredictable number of responses, averaging around a specific ratio. This creates the highest response rates and greatest resistance to extinction.
Developed by B.F. Skinner in the 1950s, combining 'variable' from Latin 'variabilis' (changeable) with 'ratio.' Skinner found this schedule most closely mimicked natural reinforcement patterns and produced the most persistent behaviors.
Variable ratio schedules are the psychological equivalent of crack cocaine for behavior - they're incredibly addictive because you never know when the next reward is coming. This is why slot machines, social media likes, and fishing are so compelling despite often poor returns!
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