In a fixed-interval schedule, what is required before a reinforcer can be obtained?

In a fixed-interval schedule, a specific amount of time must pass before a reinforcer can be obtained. This type of reinforcement schedule means that the first correct response following the fixed duration of time is what earns the reinforcement. For example, if a worker is paid every two weeks, they must wait until the end of that specific time period before receiving their paycheck, regardless of how much work they have done in that time.

The emphasis on a fixed amount of time distinguishes this schedule from variable-interval schedules, where the time required for reinforcement varies. It also sets this apart from schedules that require a response or a certain quantity of behavior, as those do not focus solely on the passage of time before obtaining the reinforcer. Thus, understanding that a fixed amount of time is essential for reinforcement is key to grasping the mechanics of fixed-interval schedules.