One- and two-day-old infants received a sucrose solution. The sucrose served as an unconditioned stimulus that elicited the unconditioned response of sucking. The conditioned stimulus consisted of the experimenter stroking the baby's forehead immediately before the delivery of sucrose. The conditioned response is the

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In classical conditioning, the conditioned response (CR) is the learned response to the previously neutral stimulus that, after association with an unconditioned stimulus (US), comes to elicit a specific reaction. In this scenario, the forehead stroking (conditioned stimulus) becomes associated with the sucrose (unconditioned stimulus), leading to sucking (unconditioned response) when the sucrose is presented. Over time, the infant learns to suck in response to the forehead stroking alone, making this the conditioned response.

One- and Two-Day-Old Infants Received a Sucrose Solution