Question

Which of the following statements is an example of conditioned reflex?

• A. Hand moving away when pierced with a needle
• B. A trained dog salivating for food after the blow of whistle
• C. In digestion food goes forward in the alimentary canal
• D. Eyes closing when something enters into it.

Answer 1

The correct option is B A trained dog salivating for food after the blow of whistle

Conditioned reflexes are not present at birth but acquired as the result of experience. When an action is performed repeatedly, the nervous system learns to react automatically.

For example : In Pavlov's classic experiment, the conditioned stimulus was a bell and the unconditioned stimulus was sour fluid (food) delivered into the mouth of a dog restrained by harness; the conditioned stimulus was followed by the unconditioned stimulus regardless of the dog's response. After training, the conditioned reflex was manifested when the dog salivated to the sound of the bell.

All the other examples are not conditioned but automatic reflexes.