Which schedule rewards after a fixed number of correct responses?

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

Answer: (D)

Rewards after a fixed number of correct responses are delivered when the behavior is followed by reinforcement after a set count of responses. This is the fixed ratio pattern. Because reinforcement depends on hitting that exact count, the subject is motivated to respond quickly to reach the required number, producing high and steady response rates with a brief pause after each reinforcement. For example, a dog might receive a treat after every four correct scent detections. This differs from a fixed interval schedule, which reinforces after a specific amount of time has passed, not a set number of responses; a variable ratio schedule, which reinforces after an unpredictable number of responses; and a continuous reinforcement schedule, which rewards after every correct response.