In a fixed interval schedule, reinforcement is provided:

The concept of a fixed interval schedule is centered around the timing of reinforcement delivery. In this schedule, reinforcement is administered after a specific amount of time has elapsed, regardless of the number of responses made during that time period. For example, if a reinforcement is provided every five minutes as long as the desired behavior has occurred at least once during that interval, this distinctly illustrates the characteristics of a fixed interval schedule.

This approach focuses on the passage of time rather than the frequency of the behavior itself. Individuals learn to anticipate receiving reinforcement at regular, predictable intervals, which can significantly influence their behavior patterns. The predictability of the reinforcement timing is a fundamental aspect of fixed interval schedules, helping individuals to associate their behavior with specific time frames rather than variable conditions.