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Pavlov, Ivan

Pavlov, Ivan 1849-1936

PAVLOVS LIFE

PAVLOVS WORK

BIBLIOGRAPHY

Ivan Petrovich Pavlov, a Russian physiologist, received a Nobel Prize for his experimental studies of the interactions of gastrointestinal secretions with the activities of the pancreas and other glands. His observations on the role of the nervous system led him to explore what he called psychic reflexessecretions of stomach acids elicited not by food itself but by stimuli such as the smells or tastes preceding food ingestion. He is best known for this discovery of conditioned, or conditional, reflexes and his subsequent experimental analyses of them. He created preparations using the salivary glands of dogs in which he could conveniently measure salivation elicited by metronomes or other arbitrary stimuli presented in various temporal relations to subsequent food deliveries.

Research inspired by Pavlovs work has been extended to applications such as the modification of emotional responding through behavior therapies. Pavlov was a principled scientist and an outspoken critic of the Soviet system in Russia, and it is unfortunate that brainwashing and other coercive methods have sometimes been attributed to his influence. These attributions are inappropriate and inaccurate because such methods are neither procedurally nor historically derivative of Pavlovs scientific contributions.

PAVLOVS LIFE

Pavlov was the son of a parish priest. Some personal characteristics appeared early and remained with him throughout his life: a passion for physical work (especially in the garden), a love of books and learning, and an unshakable integrity. His experience in working with his hands stood him in good stead later in the speed, efficiency, and delicacy of his surgical skills. His readings led him to chemistry and biology, and he came to regard as two of his intellectual heroes the physiologist Ivan M. Sechenov (18291905), for construing conscious as well as unconscious activity as reflexes of the brain, and the naturalist Charles Darwin (18091882), for his theory of natural selection. Pavlov attended a religious seminary but in 1870 dropped theology in favor of physiology and then a medical degree in Saint Petersburg. In 1881 he married Seraphema (Sara) Vasilievna. They raised two sons, Vladimir and Vselvolod, and a daughter, Vera (a third son, Mirchik, died as a child). Sara was both devout and devoted to Pavlov, and he envied her religious faith.

After completing his dissertation, Pavlov studied in Germany and then began independent research on cardiac physiology in the Saint Petersburg laboratory of the physiologist Sergei P. Botkin (18321889), who soon entrusted the direction of his laboratory to Pavlov. This allowed Pavlov to devote all of his time to research. He involved himself thoroughly in all details of an experiment and even in his earliest experimental work regarded it as essential to work with the intact organism in order to maintain as far as possible the natural conditions of the physiological systems he chose to study. He had no patience with people with motives other than knowledge, such as those who saw research as a way to satisfy nonscientific agendas. The motto in Pavlovs laboratory was Observation and observation, and he meant the direct observation of nature itself, not what someone had written about it.

Pavlov received his Nobel Prize in 1904. By the time of the Russian Revolution in 1917, his international reputation protected him from external intrusions on his research. Though he did not study the nervous system directly, he interpreted his findings in terms of changes in the irradiation of brain areas and attempted to extend his thinking to theories of language and of psychiatric disorders such as psychoses. In contrast to his contributions in physiology and conditioning, these theories did not fare well.

Pavlov maintained regular schedules of activity throughout his life, including outdoor exercise in the form of games and swims. Even during Joseph Stalins purges, he was outspoken in his denunciation of the Communist system, going so far as refusing admission to his laboratory to the Communist commissar of education and writing a letter of criticism to Stalin. Pavlov worked in his Saint Petersburg laboratory until shortly before his death of pneumonia in February 1936.

PAVLOVS WORK

The term conditioned, from the Russian phrase for conditioned reflexes, might better have been translated as conditional, because the name was applied to reflexes conditional upon relations among stimuli. In respondent conditioning, one stimulus, the conditional stimulus (CS), signals the presentation of another, the unconditional stimulus (US). The responses respectively elicited by these stimuli are the conditional response (CR) and the unconditional response (UR). Pavlovs conditioned salivary reflexes provide the prototypical example. When an originally neutral bell repeatedly signals food in the mouth of a hungry dog, it becomes a CS as salivation begins to be elicited by this signaling stimulus as well as by the US, the food itself.

Ironically, Pavlov may never have used a bell in his experiments; his rare mention of bells occurs only in later work, where it probably refers to electrically operated devices. The ubiquitous references to Pavlovs bell probably originated with a common example of a conditioned reflex in popular writings about Pavlovs research: a dinner bell eliciting salivation in those called to the table (Pavlovs own bell was kept on his desk, presumably for summoning servants).

Pavlovs conditioning procedure has been called respondent, Pavlovian, and classical conditioning, distinguishing it from procedures studied especially by the American psychologists Edward L. Thorndike (18741949) and later B. F. Skinner (19041990). In Pavlovs procedure the important features are the relations between two stimuli, whereas in Thorndikes and Skinners instrumental or operant procedures they are the relations between a stimulus and the response that has produced it.

Pavlov arranged various temporal relations between the CS and the US. For example, in both trace and delay conditioning, a relatively long time elapsed between CS and US; they were distinguished by whether the CS turned off or remained present in the interim. In both types conditional responding began shortly after the start of the CS, but with successive trials it gradually moved closer to the time of the US. Trace conditioning acquired its name from Pavlovs assumption that the CS had to leave some trace in the nervous system to be effective.

Attention to Pavlovian conditioning followed from how easily it could be related to the concept of association, a learning principle with substantial precedent in philosophy and psychology. Learning was said to take place through associations of ideas, and conditional reflexes seemed to represent a primitive example of their formation. In a kind of mental chemistry, ideas were thought to be associated through such properties as having common elements or occurring together in time. Thus conditioning was regarded as at the root of all learning.

During Pavlovs lifetime, conditioning was seen as a sort of stimulus substitution in which, through CS-US pairing, the CS acquires power to elicit the UR. But it is now clear that this account misrepresents what happens in at least three ways. First, conditioning depends not on CS-US pairings but rather on whether the CS predicts the US. If the CS is as often followed by no US as by the US, the two are often paired, but conditioning does not occur because the CS does not predict a US delivery. Second, in many preparations the CR differs in form or other properties from the UR. For example, with an intravenous opiate as the US, the CR is a diminished pain threshold, whereas the UR is a heightened pain threshold; the CS does not substitute for the US (similarly, if a metronome becomes a CS, the dog does not try to eat it). Third, preparations in which the typical latency between US and UR is long enough that a CS can be presented after the US but either before or after the UR show that conditioning depends on the CS-UR rather than the CS-US sequence. Conditioning occurs as long as the CS precedes the UR, so the relation of the CS to responding is more important than its relation to stimuli.

SEE ALSO Classical Conditioning; Empiricism; Operant Conditioning; Psychology; Skinner, B. F.; Thorndike, Edward; Union of Soviet Socialist Republics

BIBLIOGRAPHY

Babkin, Boris P. 1949. Pavlov: A Biography. Chicago: University of Chicago Press.

Catania, A. Charles, and Victor G. Laties. 1999. Pavlov and Skinner: Two Lives in Science. Russian Journal of Physiology 85 (Pavlov Sesquicentennial Issue): 13071313.

Donahoe, John W., and Rocio Vegas. 2004. Pavlovian Conditioning: The CS-UR Relation. Journal of Experimental Psychology: Animal Behavior Processes 30: 1733.

Pavlov, Ivan P. 1927. Conditioned Reflexes. Trans. G. V. Anrep. London: Oxford University Press.

Rescorla, Robert A. 1988. Pavlovian Conditioning: Its Not What You Think It Is. American Psychologist 43: 151160.

Siegel, Shepard, Riley E. Hinson, Marvin D. Krank, and Jane McCully. 1982. Heroin Overdose Death: The Contribution of Drug-Associated Environmental Cues. Science 216: 436437.

A. Charles Catania

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Pavlov, Ivan

Ivan Pavlov

Born: September 26, 1849
Ryazan, Russia
Died: February 27, 1936
Leningrad (now St. Petersburg), Russia

Russian physiologist

Ivan Pavlov was a Russian physiologist (someone who studies the physical and chemical workings of living things) and a leader in the study of blood circulation, digestion, and conditioned reflexes (unconscious physical reactions to outside forces that are the result of repetition of those forces and reactions). He believed that he established the physiological (relating to the physical and chemical workings of living things) nature of psychological (relating to the behavior of the mind) activity.

The early years

Ivan Petrovich Pavlov was born in Ryazan, Russia, on September 26, 1849, the son of a poor parish priest, from whom Pavlov acquired a lifelong love for physical labor and for learning. He loved to work with his father in gardens and orchards and this early interest in plants lasted his entire life. At the age of nine or ten, Pavlov suffered from a fall that affected his general health and delayed his formal education. When he was eleven he entered the second grade of the church school at Ryazan. In 1864 he went to the Theological Seminary of Ryazan, a school for training priests. There he studied religion, classical languages, and philosophy, and he developed an interest in science.

Making of a physiologist

In 1870 Pavlov was admitted to the University of St. Petersburg (Leningrad) in Russia. He studied animal physiology as his major and chemistry as his minor. At the university he studied organic chemistry (the science that studies how living things are made) and inorganic chemistry (the science that studies how nonliving things are made). In this way he learned about what makes up both nonliving things and plants and animals. He also learned the techniques of scientific investigation. Scientific investigation starts with asking a question; the scientist then gathers information about the question and creates a statement that might describe the answer; finally, the scientist tests the possible answer through observation.

After graduating from the University of St. Petersburg, Pavlov entered the Military Medical Academy in 1881. He worked there as a laboratory assistant for two years. In 1877, while still at the academy, he published his first work. It was about the regulation of the circulation of blood by reflexes (any unconscious or involuntary action of the body). Two years later he completed his course at the academy. He successfully competed in an examination that was given to the entire school. By winning this competition, Pavlov was given a scholarship to continue postgraduate study at the academy.

In 1881 Pavlov married Serafima Karchevskais. He spent the next decade at the academy. In 1883 he completed his thesis (a long essay resulting from original research in college) on the nerves of the heart. Shortly afterwards he received the degree of doctor of medicine. During the 1880s Pavlov perfected his techniques of scientific investigation. This work made his later important discoveries possible.

In 1890 Pavlov was appointed chairman of pharmacology (science of preparing medicines) at the academy. A year later he became director of the Department of Physiology of the Institute of Experimental Medicine. In 1895 he accepted the chair of physiology at the academy, which he held until 1925. For the next forty-five years Pavlov pursued his studies on the digestive glands and conditioned reflexes.

Scientific contributions

During the first phase of his scientific activity (18741888), Pavlov studied the circulatory system. He focused on how blood pressure changes under various conditions and how heart activity is regulated. He saw that the blood pressure of dogs in his laboratory hardly changed, whether they were fed dry food or excessive amounts of meat broth.

Pavlov observed special fibers called nerves that carry sensations and create motion throughout the body. His observations led him to state that the rhythm and the strength of the heartbeat is regulated by four specific nerve fibers. It is now generally accepted that two nerves, the vagus and sympathetic, produce the effects on the heart that Pavlov noticed.

In his second phase of scientific work (18881902), Pavlov concentrated on the nerves directing the digestive glands. In 1888 he discovered the nerves of the pancreas that control the flow of insulin. Insulin is a substance that regulates the digestion of starches and sugars. In 1889 Pavlov discovered the nerves controlling the gastric (stomach) glands. For this work Pavlov received the 1904 Nobel Prize in Physiology or Medicine.

The final phase of Pavlov's scientific career (19021936) focused on determining how conditioned reflexes affect the brain. Pavlov had observed that his laboratory dogs would secrete saliva and gastric juices before meat was actually given to them. The sight, odor, or even the footsteps of the attendant bringing the meat were enough to trigger the flow of saliva.

Pavlov realized that the dogs were responding to activity associated with their feeding. In 1901 he termed this response a "conditioned reflex." A conditioned reflex is a learned behavior, one that happens in response to something. This is different than an unconditioned reflex. An example of an unconditioned reflex is the pupil of the eye getting smaller when a person looks at a bright light. The person does not learn how to make the pupil of the eye smaller. It simply happens automatically.

Pavlov's important lectures, papers, and speeches dealing with conditioned reflexes and the brain were presented between 1923 and 1927. He discovered that conditioned responses can be wiped outat least temporarilyif not reinforced (strengthened through being rewarded).

In 1918 Pavlov had an opportunity to study several cases of mental illness. He described a certain type of schizophrenia, a very serious mental illness, as being caused by weakening of brain cells. He thought the illness was a means of protecting already weakened brain cells from further destruction.

Pavlov's last scientific article was written for the Great Medical Encyclopedia in 1934. In it he discussed his idea that there are two systems of nerve fibers. The first system receives signals or impressions of the external world through sense organs. Both humans and animals have this system. The second system deals with the signals of the first system and involves words and thoughts. Only humans have this system. Conditioned reflexes play a significant role in both nerve systems. Pavlov thought the conditioned reflex was the main way in which living things adapt to their surroundings.

Philosophy and outlook

Pavlov was opposed to extreme political positions of any kind. He did not welcome the Russian Revolution of 1917, which destroyed the old system of the czars, or Russian supreme rulers, and replaced it with a Communist system. In a Communist society, property is held by the state and the state controls the distribution of goods. Pavlov was hostile to the new Communist system. Even so, Premier Lenin (18701924; the leader of the Soviet Union) signed a special decree in 1921, assuring that Pavlov would have support for his scientific work. In 1930 the government built him a laboratory. By 1935 Pavlov had become reconciled to the Communist system. He declared that the "government, too, is an experimenter but in an immeasurably higher category."

Pavlov became seriously ill in 1935 but recovered sufficiently to participate at the Fifteenth International Physiological Congress. Later he attended the Neurological Congress in London, England. He died on February 27, 1936.

Pavlov's work on conditioned reflexes and brain activity lives on today. It formed the basis of behaviorism. Behaviorism is an important branch of psychology that deals with observing the behaviors and habits of humans and animals.

For More Information

Babkin, Boris P. Pavlov: A Biography. Chicago: University of Chicago Press, 1949.

Gray, Jeffrey A. Ivan Pavlov. New York: Viking Press, 1980.

Todes, Daniel Philip. Ivan Pavlov: Exploring the Animal Machine. New York: Oxford University Press, 2000.

Wells, Harry K. Pavlov and Freud. New York: International Publishers, 1956.

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Pavlov, Ivan

Pavlov, Ivan Ivan Petrovich Pavlov (1849–1936) was a Russian physiologist who won the Nobel Prize in Physiology or Medicine in 1904 for his work on the physiology of gastric secretion. However he is more famous for his subsequent studies on reflexes and for laying the foundations of the field of behavioural psychology.

He was the eldest of eleven children of a Russian orthodox priest, and entered the theological seminary in his home town of Ryazan, in provincial Russia, with the intention of following his father's profession. In later years he recalled to colleagues that it was seeing an illustration of the gastrointestinal tract in a book by the English writer George Henry Lewes, The Physiology of Common Life, that persuaded him to leave the religious life to study the natural sciences. This drawing of the alimentary system was based on the physiological research work of Claude Bernard, and the complexity of it challenged Pavlov to explore its intricacies further.

Pavlov entered the university of St Petersburg in 1879 to study medicine, and, after graduating, obtained his doctorate in 1883 from the Medical Military Academy, also in St Petersburg. As a student he had been particularly influenced by, and collaborated with, the physiologist Elie Cyon, and on Cyon's advice he studied the nerves to the pancreas, and identified those which stimulated the secretion of its digestive juices; for this he was awarded the University's gold medal. It was thus a natural progression for him to travel abroad to study with two of the greatest living physiologists, Carl Ludwig in Leipzig and Rudolph Heidenhain in Breslau. Soon after returning to St Petersburg he was appointed Professor of Physiology at the Medical Military Academy, in 1890. He remained there until 1924, when the newly-created Soviet Academy of Sciences established a special Institute of Physiology for him.

Pavlov's work can be divided into two distinct phases: earlier work on digestion, and later work on the conditioned reflex. He was a noted experimenter and renowned surgeon, and, using anaesthetized experimental animals, usually dogs, he created several ‘windows’ in the body through which the secretions of the stomach, salivary glands, pancreas, and intestine could be collected. Of particular value was his ability to bring the stomach out through the body wall with its nerve and blood supply intact, so that he could observe its functions in a conscious dog, behaving normally. He also made an artificial hole in the oesophagus (gullet) so that food taken into the mouth escaped before it reached the stomach. Together, these allowed him to show that gastric juices were secreted in anticipation of receiving food from the mouth, and also to collect and study the secretions uncontaminated by food particles. His techniques led to the discovery and identification of several key enzymes and mechanisms that occur in normal digestion. This work had commercial spin-offs: from 1898 onwards Pavlov's lab contained a ‘gastric acid factory’, the acid produced by the dogs being collected and sold as a remedy for dyspepsia, and by 1904 the project was contributing over 65% of the laboratory's budget.

Perhaps the most influential observation he made was in the early years of the twentieth century, when he noticed that even the mere sight and smell of food could stimulate the anticipatory production of salivary and gastric secretions in his experimental dogs. Further systematic experiments on this phenomenon revealed that if the appearance of food was repeatedly preceded by the ringing of a bell, then eventually the dog would produce secretions after hearing the bell, and before or without the appearance of food. This encouraged Pavlov and his co-workers to turn their attention to the activities of the higher nervous system and to the further study of such responses, which he originally called a ‘conditional reflex’, because ‘their inclusion as reflexes had for him a conditional character’. To English speakers the expression has now become known as ‘conditioned reflex’, although the French still refer to ‘le réflexe conditionnel’. His work from then onwards focused on links between nervous activity and behaviour, extending into observational and theoretical work on human behaviour. Many of his views were rapidly absorbed into psychological and psychiatric practice and teaching.

By the time of the Russian and Bolshevik revolutions in 1917, Pavlov was a world-renowned scientist. He was subsequently courted by the new regime, which wanted to build up Soviet science. In the years immediately after the revolutions Pavlov frequently denounced the Bolsheviks and their ideology, and at one period considered emigrating. He was, however, offered privileges for himself and his colleagues that permitted him to continue working, and by the 1930s had apparently reconciled himself to living in Soviet Russia, particularly through his friendship with Nikolai Bukharin. He continued nonetheless to be a critic of the government, and was subject to secret police surveillance for many years up to his death in 1936.

E. M. Tansey

Bibliography

Brown, E. M. (1990). Ivan Petrovich Pavlov . In Nobel Laureates in Medicine or Physiology: a biographical dictionary, (ed. D. M. Fox, M. Meldrum, and I. Rezak). Garland Publishing, New York.
Todes, D. P. (1995). Pavlov and the Bolsheviks. History and Philosophy of the Life Sciences, 17, 379–418.
Todes, D. P. (1997). Pavlov's physiology factory. Isis, 88, 205–46.
Todes, D. P. (1997). From the machine to the ghost within: Pavlov's transition from digestive physiology to conditional reflexes. American Psychologist, 52, 947–55.


See also conditioning.

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Pavlov, Ivan

Ivan Pavlov

1849-1936
Russian physiologist and Nobel laureate best known for his development of the concept of the conditioned reflex, or conditioned response.

Ivan Pavlov was born into an impoverished family in the rural village of Ryazan, Russia. He won a government scholarship to the University of St. Petersburg and studied medicine at the Imperial Medical Academy, receiving his degree in 1883. In 1890, Pavlov was appointed to a professorship at the St. Petersburg Military Academy and a few years later joined the faculty of the University of St. Petersburg. He organized the Institute of Experimental Medicine in 1895, which was to be his research laboratory for the next 40 years.

In the 1890s, Pavlov investigated the workings of the digestive systemfocusing on digestive secretions using special surgically created openings in the digestive tracts of dogs, a project strongly influenced by the work of an earlier physiologist, Ivan Sechenov (1829-1905). As a result of this research, Pavlov was awarded the Nobel Prize for Physiology and Medicine in 1904. During his investigations in this area, Pavlov observed that normal, healthy dogs would salivate upon seeing their keeper, apparently in anticipation of being fed. This led him, through a systematic series of experiments, to formulate the principles of the conditioned response , which he believed could be applied to humans as well as to animals. According to Pavlov's system, an unconditioned stimulus, such as offering food to a dog, produced a response, or unconditioned reflex, that required no training (salivation). In contrast, a normally neutral act, such as ringing a bell, became a conditioned stimulus when associated with the offering of food and eventually would produce salivation also, but as a conditioned reflex. According to Pavlov, the conditioned reflex was a physiological phenomenon caused by the creation of new reflexive pathways created in the cortex of the brain by the conditioning process. In further studies of the cortex, Pavlov posited the presence of two important processes that accompany conditioning: excitation, which leads to the acquisition of conditioned responses, and inhibition, which suppresses them. He eventually came to believe that cortical inhibition was an important factor in the sleep process.

Pavlov continued working with conditioned reflexes throughout the early decades of the twentieth century, generating several addition principles through further experimentation. The principle of timing dictated that the neutral stimulus must precede the unconditioned reflex in order to become a conditioned stimulus. (In other words, a buzzer would have to go off before food was offered to a dog in order for the dog to associate the food and buzzer with each other). The concept of extinction referred to the fact that a conditioned response could be "unlearned" if the neutral stimulus (buzzer) was repeatedly used without reinforcement (food). Generalization was the name given to the observation that a stimulus similar to the conditioned stimulus would still produce a response as the dog generalized from its original experience to a similar one, but the response would be less pronounced in proportion to the difference between the stimuli. Finally, testing the limits of the dogs' ability to differentiate among stimuli led, unexpectedly, to experimental

neuroses, similar to mental breakdowns in humans, when the subjects were forced to confront conflicting or ambiguous stimuli for any length of time. Observing the ways in which neurotic symptoms differed among test subjects led Pavlov between 1916 and 1936 to formulate a theory of four different types of temperament linked to physiological differences based on differences in excitatory and inhibitory activity. Attempting to extend the implications of this theory to human psychopathology, Pavlov helped establish the Soviet Union's continuing tradition of organically-based psychiatric treatment.

Pavlov, who died of pneumonia in 1936, tried to apply his ideas to psychiatry, and was influential enough to be considered one of the founders of Russian psychiatry, and he remains a dominant figure in Russian psychology. Although he never considered himself a psychologist, Pavlov's ultimate belief in conditioning as the fundamental unit of learning in humans and animals provided one of the cornerstones of the behaviorist school of psychology in the United States. It is ironic that, although Pavlov was a staunch critic of communism, in the late 1920s Joseph Stalin (1879-1953) chose Pavlov's work as the basis for a new Soviet psychology. Pavlov's books include Lectures on the Work of the Principal Digestive Glands (1897), Lectures on Conditioned Reflexes (1928), and Conditioned Reflexes and Psychiatry (1941).

See also Behaviorism

Further Reading

Babkin, Boris P. Pavlov: A Biography. Chicago: University of Chicago Press, 1949.

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