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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.
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).
Edwin Burket Twitmyer (1873–1943) was professor of Psychology and director of the Psychological Laboratory and Clinic at the University of Pennsylvania.He is a little-known figure in the history of psychology, but he independently discovered classical conditioning at approximately the same time as the famous Russian physiologist, Ivan Pavlov, who is normally given credit for this achievement.
He and his associates discovered and published the basic facts about this process, which has come to be called classical or Pavlovian conditioning. [ 1 ] Among the phenomena that Pavlov observed was the partial recovery of a classically conditioned response after it had been extinguished by withholding the unconditioned stimulus.
In Pavlov's original demonstration of classical conditioning, he used a backward conditioning arrangement as the control condition. Briefly, in that procedure, the dogs experienced the same number of US presentations (food) and the same number of CS presentations (metronome ticking) as the experimental groups, but the timing of the CS and US ...
Classical conditioning was first discovered by Pavlov, who studied digestive reflexes in dogs- the results showed that different stimuli (different types of food) elicit different reflexes and responses (different compositions of saliva). [3] He then discovered that the dogs salivated before they received the food- due to the antecedent. [3]
Ivan Pavlov discovered classical conditioning. He observed that if dogs come to associate the delivery of food with a white lab coat or the ringing of a bell, they produce saliva, even when there is no sight or smell of food. Classical conditioning considers this form of learning the same, whether in dogs or in humans. [13]
In classical or respondent conditioning, a neutral stimulus (conditioned stimulus) is delivered just before a reflex-eliciting stimulus (unconditioned stimulus) such as food or pain. This typically done by pairing the two stimuli, as in Pavlov's experiments with dogs, where a bell was followed by food delivery.