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Classical conditioning occurs when a conditioned stimulus (CS) is paired with an unconditioned stimulus (US). Usually, the conditioned stimulus is a neutral stimulus (e.g., the sound of a tuning fork), the unconditioned stimulus is biologically potent (e.g., the taste of food) and the unconditioned response (UR) to the unconditioned stimulus is an unlearned reflex response (e.g., salivation).
Ivan Petrovich Pavlov (Russian: Иван Петрович Павлов, IPA: [ɪˈvan pʲɪˈtrovʲɪtɕ ˈpavləf] ⓘ; 26 September [O.S. 14 September] 1849 – 27 February 1936) [2] was a Russian and Soviet experimental neurologist and physiologist known for his discovery of classical conditioning through his experiments with dogs.
However, the dogs did learn something - the presentation of the metronome predicted the absence of the food. This phenomenon we now call "conditioned inhibition." However, since Pavlov was studying conditioned excitation, by measuring drops of saliva, he could not experimentally measure the inhibition of salivation.
Ivan Pavlov conducted multiple experiments investigating digestion in dogs in which neutral, unconditioned, and conditioned stimuli were used. In these experiments, the neutral stimulus was the sound of a bell ringing. This sound was presented to the dogs along with food, which acted as an unconditioned stimulus.
Ivan Pavlov's dog experiment is a well-known experiment that illustrates these terms. The unconditioned stimulus is the dog's food that would naturally cause salivation, which is an unconditioned response. Pavlov then trained the dog by ringing the bell every time before food.
In his experiments with dogs, Ivan Pavlov usually used the salivary reflex, namely salivation (unconditioned response) following the taste of food (unconditioned stimulus). Pairing a neutral stimulus, for example, a bell (conditioned stimulus) with food caused the dog to elicit salivation (conditioned response).
One of Pavlov's dogs with a surgically implanted cannula to measure salivation, Pavlov Museum, 2005. Ivan Pavlov's experiments with dogs and classical conditioning (1900s) John B. Watson and Rosalie Rayner conduct the Little Albert experiment showing evidence of classical conditioning (1920)
Ivan Pavlov is very influential when it comes to studying discrimination learning. His studies involving salivating dogs demonstrated an ability in the dogs to differentiate a stimulus that would elicit a reward and a stimulus that would not.