A stimulus that does not elicit or evoke behavior.

• A. Neutral stimulus
• B. Eliciting stimulus
• C. Conditioned stimulus
• D. Unconditioned stimulus

Answer: (A)

In classical conditioning, a neutral stimulus is a stimulus that does not elicit a response on its own. It has no inherent meaning or reflex until it is paired with an unconditioned stimulus that naturally triggers a response. After repeated pairings, this neutral stimulus becomes a conditioned stimulus and can evoke a learned (conditioned) response even without the unconditioned stimulus present. For example, a bell ring starts as neutral; when it’s consistently paired with food (an unconditioned stimulus that causes salivation), the bell alone eventually makes the dog salivate (a conditioned response). The other terms describe stimuli that naturally trigger responses or acquire that ability only after learning: an eliciting or unconditioned stimulus triggers a response without prior learning, while a conditioned stimulus triggers a response after association.