The correct answer is neutral; conditioned
Neutral stimulus is part of the classical conditioning model in the field of behavioral psychology that indicates that a stimulus provokes a response, with neutral stimulus being so called because it does not provide the desired response in a subject.
The dogs in their experiment salivated in response to the food, but after repeatedly pairing the presentation of food with the sound of a bell, the dogs began to salivate only with the noise of the bell. In this example, the bell sound was the conditioned stimulus.
