Differentiate between fixed-ratio and fixed-interval schedules of reinforcement and their effect on behaviour.

Differentiate between fixed-ratio and fixed-interval schedules of reinforcement and their effect on behaviour.

• A. Fixed-ratio reinforces after a set number of responses (high response rate with a post-reinforcement pause); fixed-interval reinforces after a fixed time (produces a scalloped pattern of responding).
• B. Fixed-ratio reinforces after a fixed time interval; fixed-interval reinforces after a fixed number of responses.
• C. Both schedules produce identical response patterns; there are no differences.
• D. Fixed-interval leads to a high steady rate with no pauses; fixed-ratio shows a scalloped pattern.

Answer: (A)

The main idea here is how the timing of reinforcement shapes when and how often an organism responds. With a fixed-ratio schedule, reinforcement comes after a set number of responses. Because the reward is tied to completing that unit of work, the organism tends to respond quickly in bursts and then pause briefly after each reinforcement—the post-reinforcement pause—to prepare for the next set of responses. With a fixed-interval schedule, reinforcement becomes available after a fixed amount of time regardless of how many responses occur. Early in the interval, responses are infrequent, but as the end of the interval approaches, the rate increases, producing a scalloped pattern on the response record where pauses are followed by rising responding as the next reinforcement nears. So the option that describes reinforcement after a set number of responses leading to a high response rate with a post-reinforcement pause, and reinforcement after a fixed time producing a scalloped pattern, matches what these schedules produce. The other statements mix up the schedules or claim identical patterns, which isn’t the case—the two schedules produce distinct response patterns.

The main idea here is how the timing of reinforcement shapes when and how often an organism responds. With a fixed-ratio schedule, reinforcement comes after a set number of responses. Because the reward is tied to completing that unit of work, the organism tends to respond quickly in bursts and then pause briefly after each reinforcement—the post-reinforcement pause—to prepare for the next set of responses. With a fixed-interval schedule, reinforcement becomes available after a fixed amount of time regardless of how many responses occur. Early in the interval, responses are infrequent, but as the end of the interval approaches, the rate increases, producing a scalloped pattern on the response record where pauses are followed by rising responding as the next reinforcement nears.

So the option that describes reinforcement after a set number of responses leading to a high response rate with a post-reinforcement pause, and reinforcement after a fixed time producing a scalloped pattern, matches what these schedules produce. The other statements mix up the schedules or claim identical patterns, which isn’t the case—the two schedules produce distinct response patterns.