Final answer:
A fixed interval reinforcement schedule is a restriction placed on an interval schedule which requires that the primed response must occur within a specified span of time following that interval in order to be eligible for reinforcement.
Step-by-step explanation:
A fixed interval reinforcement schedule is a restriction placed on an interval schedule which requires that the primed response must occur within a specified span of time following that interval in order to be eligible for reinforcement. This means that the reinforcement will only be given if the response occurs within a specific time frame after the interval. For example, if a fixed interval reinforcement schedule is set for every 30 minutes, the response must occur within the 30-minute window to receive reinforcement.