What type of reinforcement is used when rewards are given after varying amounts of time?

The type of reinforcement that involves providing rewards after varying amounts of time is known as variable interval reinforcement. This approach is characterized by the unpredictability of the timing of the rewards, which can encourage persistent behavior since the individual cannot predict exactly when the next reinforcement will occur. This uncertainty creates a consistent level of engagement or response as the subject learns that rewards can happen at any time, thus maintaining motivation over an extended period.

In contrast, fixed interval reinforcement provides rewards at set, predictable times, which can lead to a scalloped pattern of responding, as individuals may only increase their behavior as the time for reinforcement approaches. Continuous reinforcement entails providing rewards for every instance of the desired behavior, which can quickly lead to high rates of response but may not maintain behavior as effectively over time. Intermittent reinforcement is a broader category that includes both fixed and variable schedules, but it doesn’t specify that the intervals are variable, which is essential for distinguishing it from variable interval reinforcement.