Which schedule is defined by reinforcement after a fixed number of correct responses?

• A. Fixed Interval Reward Schedule
• B. Fixed Ratio Reward Schedule
• C. Continuous Reward Schedule
• D. Variable Ratio Reward Schedule

Answer: (B)

Reinforcement after a fixed number of correct responses describes a fixed ratio schedule. Here, reinforcement is contingent on meeting a specific count of responses, and that count does not change across sessions (for example, every third correct response). The key is that the reward depends on the number of responses, not on time.

This differs from a fixed interval schedule, which rewards after a set amount of time regardless of how many responses occur; a continuous reinforcement schedule would reward after every correct response (a special case of a ratio schedule with the fixed count being one); and a variable ratio schedule rewards after an unpredictable number of responses, not a fixed count.