Explain the intermittent reinforcement schedules in your own words

In behaviorism, Intermittent Reinforcement is a conditioning schedule in which a reward or punishment (reinforcement) is not administered every time the desired response is performed. ... On an intermittent reinforcement schedule the mouse would only receive food every few times (it is typically random and unpredictable).

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snell's law

refractve index = sin incidence / sin refraction