What is a key characteristic of a Fixed Ratio Schedule?

A Fixed Ratio Schedule is characterized by the delivery of reinforcement after a predetermined number of responses have been made. This means that for every specific number of actions or responses performed by the subject, a reward or reinforcement is provided. For instance, if a reinforcement is given after every fifth response, the subject knows that they need to complete five actions to receive their reinforcement. This schedule typically leads to a high rate of responding, as subjects may quickly engage in the desired behavior to reach the set ratio for reinforcement.

The other options do not align with the definition of a Fixed Ratio Schedule. Reinforcement based on time intervals describes a Fixed Interval Schedule rather than a Fixed Ratio. Random reinforcement pertains to a Variable Ratio Schedule, where the number of responses needed can vary unpredictably. Lastly, stating that reinforcement is independent of prior responses applies more to schedules such as Variable Interval, where the timing of reinforcement is irregular and does not depend on the number of past responses.