The textbook states that Pavlov "had to pick a stimulus that was more controlled than the sound of someone walking into a room" in order to investigate classical conditioning more systematically. In other words, Pavlov had to deliberately manipulate the neutral stimulus to conduct:

Question

Quizplus · Accepted Answer

Pavlov had to manipulate the neutral stimulus in order to conduct experimental research, where he could systematically test the effects of the stimulus on the conditioned response. Correlational studies, case studies, and observational research do not involve this deliberate manipulation of the stimulus.

The Textbook States That Pavlov "Had to Pick a Stimulus