What is the main characteristic of a fixed-ratio schedule of reinforcement?

• A. Reinforcement is provided after a random number of responses.
• B. Reinforcement is delivered after a variable number of responses.
• C. Reinforcement is delivered after a set number of responses.
• D. Reinforcement is given at fixed intervals of time.

Answer: (C)

A fixed-ratio schedule of reinforcement is characterized by the delivery of reinforcement after a specific, predetermined number of responses have been made. This means that the individual must complete a certain number of actions or behaviors before receiving a reward. For instance, in a scenario where a rat must press a lever five times to receive food, the reinforcement occurs consistently after that fixed number of lever presses.

This predictability leads to a high rate of response as the individual learns the exact number of required responses to obtain the reinforcement. The clear distinction of a fixed-ratio schedule compared to other types lies in the "fixed" nature of the response requirement, which does not change or vary. Understanding this principle is vital for application in various contexts, such as behavioral training, marketing strategies, and understanding conditioning in psychological studies.