Which of the following was cited as a strength of Pavlov's conditioning study?

• A. It used highly controlled conditions to ensure salivation was caused only by the bell.
• B. The measurement of salivation was done with a salinometer to obtain statistical data.
• C. The experiment was conducted inside the main lab to keep dogs comfortable.
• D. The dogs were allowed to swallow the food freely to reflect natural behavior.

Answer: (A)

The key idea is experimental control. Pavlov’s study is celebrated for tightly controlling everything except the key variable, so salivation could be attributed to the learned link between the bell (a neutral stimulus) and food (the unconditioned stimulus). By keeping the environment and timing consistent and measuring a clear, observable outcome (the amount of saliva), the study convincingly shows acquisition of a conditioned response rather than effects from other factors. The other options aren’t accurate descriptions of the method—there wasn’t a salinometer used, the lab setup wasn’t about keeping dogs comfortable in that sense, and allowing free swallowing wouldn’t provide the clean, controlled measure Pavlov needed.