What type of schedule involves reinforcing a response only after a specified number of responses?

A Fixed Ratio Schedule is characterized by providing reinforcement after a specific number of responses have been made. This means that for every predetermined number of responses, the individual receives a reward. For example, if a worker is paid for every ten widgets they complete, that reflects a fixed ratio schedule. The predictability of the reinforcement can lead to a high and consistent rate of responses, as individuals are motivated to complete the required number of actions to receive the reinforcement.

In contrast, other types of schedules, such as Variable Ratio, Fixed Interval, and Variable Interval, have different structures for reinforcement that do not adhere to this specific requirement of reinforcing after a set number of responses. Variable Ratio schedules provide reinforcement after a random number of responses, Fixed Interval rewards after a set period regardless of the number of responses, and Variable Interval reinforces at unpredictable time intervals. Thus, the defining aspect of a Fixed Ratio Schedule is the focus on the number of completed responses before receiving reinforcement, making it the correct answer.