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Pavlov's DogsBy Saul McLeod (saul-mcleod.html), updated 2018
Like many great scientific advances, Pavlovian conditioning (aka classical conditioning) was discovered accidentally.
During the 1890s, Russian physiologist, Ivan Pavlov was researching salivation in dogs in response to being fed. He inserteda small test tube into the cheek of each dog to measure saliva when the dogs were fed (with a powder made from meat).
Pavlov predicted the dogs would salivate in response to the food placed in front of them, but he noticed that his dogs wouldbegin to salivate whenever they heard the footsteps of his assistant who was bringing them the food.
Pavlov classical conditioning
When Pavlov discovered that any object or event which the dogs learned to associate with food (such as the lab assistant)would trigger the same response, he realized that he had made an important scientific discovery. Accordingly, he devoted the
rest of his career to studying this type of learning.
Pavlovian Conditioning
Pavlov (1902) started from the idea that there are some things that a dog does not need to learn. For example, dogs don’t learn to salivatewhenever they see food. This reflex is ‘hard-wired’ into the dog.
In behaviorist terms (behaviorism.html), food is an unconditioned stimulus and salivation is an unconditioned response. (i.e., a stimulus-response connection that required no learning).
Unconditioned Stimulus (Food) > Unconditioned Response (Salivate)
In his experiment, Pavlov used a metronome as his neutral stimulus. By itself the metronome did not elecit a response from the dogs.
Neutral Stimulus (Metronome) > No Conditioned Response
Next, Pavlov began the conditioning procedure, whereby the clicking metronome was introduced just before he gavefood to his dogs. After a number of repeats (trials) of this procedure he presented the metronome on its own.
As you might expect, the sound of the clicking metronome on its own now caused an increase in salivation.
Conditioned Stimulus (Metronome) > Conditioned Response (Salivate)
So the dog had learned an association between the metronome and the food and a new behavior had been learned.Because this response was learned (or conditioned), it is called a conditioned response (and also known as a Pavlovianresponse). The neutral stimulus has become a conditioned stimulus.
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Pavlov found that for associations to be made, the two stimuli had to be presented close together in time (such as a bell). He called this thelaw of temporal contiguity. If the time between the conditioned stimulus (bell) and unconditioned stimulus (food) is too great, then learningwill not occur.
Pavlov and his studies of classical conditioning have become famous since his early work between 1890-1930. Classical conditioning is"classical" in that it is the first systematic study of basic laws of learning / conditioning.
SummaryTo summarize, classical conditioning (classical-conditioning.html)(later developed by Watson, 1913) involves learning to associate anunconditioned stimulus that already brings about a particular response (i.e., a reflex) with a new (conditioned) stimulus, so that the newstimulus brings about the same response.
Pavlov classical conditioning diagram
Pavlov developed some rather unfriendly technical terms to describe this process. The unconditioned stimulus (or UCS) is the object orevent that originally produces the reflexive / natural response.
The response to this is called the unconditioned response (or UCR). The neutral stimulus (NS) is a new stimulus thatdoes not produce a response.
Once the neutral stimulus has become associated with the unconditioned stimulus, it becomes a conditioned stimulus(CS). The conditioned response (CR) is the response to the conditioned stimulus.
(simplypsychology.org-Pavlov.pdf) Download this article as a PDF (simplypsychology.org-Pavlov.pdf)
ReferencesPavlov, I. P. (1897/1902). The work of the digestive glands. London: Griffin.
Pavlov, I. P. (1928). Lectures on conditioned reflexes. (Translated by W.H. Gantt) London: Allen and Unwin.
Pavlov, I.P. (1927). Conditioned Reflexes: An investigation of the physiological activity of the cerebral cortex. Retrieved fromhttp://psychclassics.yorku.ca/Pavlov/lecture6.htm.
Pavlov, I. P. (1955). Selected works. Moscow: Foreign Languages Publishing House.
Watson, J.B. (1913). Psychology as the Behaviorist Views It. Psychological Review, 20, 158-177.
Further Information
(simplypsychology.org-Pavlov.pdf) Download this article as a PDF (simplypsychology.org-Pavlov.pdf)
Behaviorism (behaviorism.html)
Classical Conditioning (classical-conditioning.html)
Operant Conditioning (operant-conditioning.html)
Listen to a MIT undergraduate lecture on Conditioning (Conditioning.rm)
Classical Conditioning (Classical%20Conditioning.pdf)
Learning and Behavior (learning.ppt)
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How to reference this article:McLeod, S. A. (2018, Oct 08). Pavlov's dogs. Retrieved from https://www.simplypsychology.org/pavlov.html
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