What characterizes a fixed-interval schedule of reinforcement?

A fixed-interval schedule of reinforcement is characterized by the provision of reinforcement after a specific period of time has elapsed, assuming that the desired behavior occurs during that interval. This means that the individual learns to associate the passage of time with the opportunity to earn a reward, leading to behavior that increases as the end of the interval approaches.

For example, if a worker receives a paycheck every two weeks, they may increase their work effort as the pay period draws close, knowing that their reinforcement (the paycheck) is contingent upon having worked during that timeframe. The consistency of reinforcement occurring after a set time period creates a predictable pattern in the behavior of the subject.

In contrast, the other options describe different reinforcement schedules or scenarios that do not align with the concept of fixed-interval reinforcement. This distinction helps clarify how reinforcement can be structured and what effects it has on behavior over time.