AP BIOLOGY

Detailed explanation-1: -Pavlov tested that food produced saliva but the sound of a tuning fork did not. This showed that the tuning fork was a neutral stimulus for the dogs.

Detailed explanation-2: -The dogs salivating for food is the unconditioned response in Pavlov’s experiment. A conditioned stimulus is a stimulus that can eventually trigger a conditioned response. In the described experiment, the conditioned stimulus was the ringing of the bell, and the conditioned response was salivation.

Detailed explanation-3: -The sound of a metronome was chosen to be the neutral stimulus. The dogs would first be exposed to the sound of the ticking metronome, and then the food was immediately presented. After several conditioning trials, Pavlov noted that the dogs began to salivate after hearing the metronome.

Detailed explanation-4: -Salivation is one such conditioned reflex; it occurs only when a person is conscious of the presence of food or when one imagines food.

Detailed explanation-5: -During conditioning, the unconditioned stimulus (food) is presented repeatedly just after the presentation of the neutral stimulus (bell). After conditioning, the neutral stimulus alone produces a conditioned response (salivation), thus becoming a conditioned stimulus.