Watson, John B.

From New World Encyclopedia
(39 intermediate revisions by 7 users not shown)
Line 1: Line 1:
[[Category:Politics and social sciences]]
+
[[Category:Psychologists]]
[[Category:Psychology]]
+
{{Copyedited}}{{Paid}}{{Approved}}{{Images OK}}{{Submitted}}
[[Category:Biography]]
+
{{epname|Watson, John B.}}
  
{{epname}}
 
  
[[Image:John Watson.jpg|thumb|John B. Watson]]
+
'''John Broadus Watson''' (January 9, 1878 – September 25, 1958) was an [[United States|American]] [[psychologist]] who established the psychological school of [[behaviorism]]. He did extensive research on animal behavior, but is perhaps best known for having claimed that he could take any 12 healthy infants and, by applying behavioral techniques, create whatever kind of person he desired. Watson also conducted the controversial "Little Albert" experiment, and his own personal life generated scandal. Nevertheless his work had great significance for the field of [[psychology]], leading to the development of research methods and new understanding, despite its limitations.
 +
{{toc}}
 +
== Life ==
  
'''John Broadus Watson''' ([[January 9]], [[1878]]–[[September 25]], [[1958]]) was an [[United States|American]] [[psychology|psychologist]] who established the [[List of psychological schools|psychological school]] of [[behaviorism]]. He did extensive research on  animal behavior, but is perhaps best known for having claimed that he could take any 12 healthy infants and, by applying behavioral techniques, create whatever kind of person he desired. Watson also conducted the controversial "[[Little Albert]]" experiment. He later went on to become a popular author on child rearing and an acclaimed contributor to the advertising industry.
+
===Early Life===
  
== Life ==
+
John Broadus Watson was born in 1878 in Greenville, [[South Carolina]], to Emma and Pickens Watson. His family was poor, and his father left them in 1891. A precocious but troublesome student, he entered Furman University in 1894, and graduated with a master’s degree at the age of 21.
  
=== Childhood and Education===
+
After spending a year teaching [[grade school]], he entered the [[University of Chicago]] to study [[philosophy]] with [[John Dewey]]. However, after studying with Dewey, Watson claimed not to understand his teaching, and he soon sought out a different academic path. He considered working on the [[physiology]] of the dog's brain with the radical biologist, [[Jacques Loeb]], but later chose [[psychologist]] [[James Rowland Angell]] and physiologist Henry Donaldson as his advisors. His teachers were highly influential in his development of [[behaviorism]], a descriptive, objective approach to the analysis of behavior.
  
Watson was born and raised in [[Greenville, South Carolina]], and entered [[Furman University]] in 1894.  He was a precocious but troublesome student, and graduated with a masters degree at the age of 21. He spent a year teaching grade school, then entered the [[University of Chicago]] to study philosophy with [[John Dewey]] on the recommendation of a Furman professor.   Watson claimed not to understand Dewey's teaching, and soon sought out a different academic path. He considered working on the physiology of the dog's brain with the radical biologist, [[Jacques Loeb]] but soon settled on [[functionalist]] psychologist [[James Rowland Angell]] and physiologist [[Henry Donaldson]] as his advisors. His teachers were highly influential in his development of behaviorism, a descriptive, objective approach to the analysis of behavior. Watson graduated in 1903, but stayed at the University of Chicago for several years doing research on the relationship between sensory input and learning and bird behavior. In 1907, at age 29, his reputation as a top researcher in animal behavior earned him a position at [[Johns Hopkins University]] as a full professor of psychology.
+
In 1901, Watson married Mary Ickes, whom he had met at the University of Chicago. They had two children together, Mary and John. Watson graduated in 1903 with a Ph.D. in [[psychology]], but stayed at the University of Chicago for several years doing research on the relationship between sensory input and learning and bird behavior. In 1907, at age 29, his reputation as a top researcher in animal behavior earned him a position at [[Johns Hopkins University]] as a professor of psychology.
  
 
=== Rosalie Rayner affair ===
 
=== Rosalie Rayner affair ===
  
In October 1920 Watson was asked to leave his faculty position at Johns Hopkins University because of his affair with his top research assistant, a graduate student named [[Rosalie Rayner]]. Watson was already married to [[Mary Ickes]] (sister of [[Harold L. Ickes]],future Secretary of the Interior to U.S. President [[Franklin D. Roosevelt]]). Johns Hopkins president [[Frank Goodnow]] reportedly gave Watson a choice: his relationship with Rayner, or keeping his job at Hopkins.  Rayner was a member of a prominent Baltimore political family; an affair involving two powerful  [[Baltimore, Maryland|Baltimore]] political families (the Ickes and the Rayners) could bring considerable embarrassment to the university if ignored. Not only was the Watsons' split in December front page news, but Baltimore newpapers also published excerpts from some of Watson's love letters to Rayner. Watson's closeness to Rayner, a woman half his age,was so strong that he resigned from Johns Hopkins. He was divorced by his wife, Mary Ickes, and married Rayner in December 1920. The scandal that Watson had brought upon Johns Hopkins, one of the world's top research universities at the time, was so great that his reputation among the U.S. academic elite was ruined. Watson realized this, and knew that he now had to start over in a new career at the age forty-two.
+
In October 1920, Watson was asked to leave his faculty position at Johns Hopkins University due to an affair with his top research assistant, a graduate student named Rosalie Rayner. Both Rayner and Watson's wife, the sister of future Secretary of the Interior [[Harold L. Ickes]], were members of prominent Baltimore political families. Not only was the Watsons' divorce that December front page news, but Baltimore papers also published excerpts from some of Watson's love letters to Rayner. Johns Hopkins president, Frank Goodnow, reportedly gave Watson a choice: his relationship with Rayner, or keeping his job at Hopkins. Watson's closeness to his research assistant, a woman half his age, was so strong that he resigned from Johns Hopkins and married Rayner in December 1920. They also had two children together, James and William.
 +
 
 +
Watson based many of his behaviorist studies on his children, which strained relationships within the family. With his affair with Rayner, he brought a scandal upon Johns Hopkins that was so great that his reputation among the U.S. academic elite was ruined. Consequently, Watson had to start over in a new career at the age of 42.
  
 
=== Later life ===
 
=== Later life ===
  
Watson stopped writing for popular audiences in 1936, and retired from advertising several years later around the age of 65. After Rosalie Rayner's death in 1935, Watson lived on a farm with a female companion until his death. Watson was rumored to have been a heavy drinker, but he actually gave up alcohol on the advice of his physician and enjoyed good health well into old age. He died in 1958 at age 80, shortly after receiving a citation from the American Psychological Association for his contributions to psychology. Historian John Burnham interviewed Watson late in his life, and reported him to still be a man of strong opinions and some bitterness towards his detractors. Except for a set of reprints of his academic works, Watson burned his very large collection of letters and personal papers, thus depriving historians of a valuable resource for understanding the early history of behaviorism and Watson himself.
+
Watson stopped writing for popular audiences in 1936, and retired from advertising several years later. After Rosalie Rayner's death in 1935, he lived on a farm in Connecticut. He was rumored to have been a heavy drinker, but he actually gave up alcohol on the advice of his physician and enjoyed good health well into old age. He died in 1958 at age 80, shortly after receiving a citation from the American Psychological Association for his contributions to psychology. Historian John Burnham interviewed Watson late in his life, and reported him to still be a man of strong opinions and some bitterness towards his detractors. Except for a set of reprints of his academic works, Watson burned his very large collection of letters and personal papers, thus depriving historians of a valuable resource for understanding the early history of behaviorism and Watson himself.
  
 
==Work==
 
==Work==
  
 
=== Studies on animal behavior ===
 
=== Studies on animal behavior ===
His dissertation from the University of Chicago "Animal Education: An Experimental Study on the Psychical Development of the White Rat, Correlated with the Growth of its Nervous System," is the first modern scientific book on rat behavior. It has been described as a "classic of developmental psychobiology" by historian of psychology, [[Donald Dewsbury]]. "Animal Education" described the relationship between brain myelinization and learning ability in rats at different ages. Watson showed that the degree of myelinization was largely unrelated to learning ability. The major work he did in the years he worked at the Univeristy of Chicago after graduating was a series of ethological studies of sea birds done in the [[Dry Tortugas Islands]] in [[Florida]]. He studied all aspects of the birds' behavior imprinting, homing, mating and nesting habits, feeding, and chick-rearing. These extensive studies, carried out over four years, are some of the earliest examples of what would later be called "[[ethology]]", and his comprehensive records of the birds' behavior were some of the earliest examples of the "ethogram"a comprehensive record of the naturally occurring behavior of an organism.  
+
His dissertation from the [[University of Chicago]], "Animal Education: An Experimental Study on the Psychical Development of the White Rat, Correlated with the Growth of its Nervous System," was the first modern scientific book on rat behavior. It has been described as a "classic of developmental psychobiology" by historian of psychology, Donald Dewsbury. "Animal Education" described the relationship between [[brain]] [[myelin]]ization and [[learning]] ability in rats at different ages. Watson showed that the degree of myelinization was largely unrelated to learning ability.  
 +
 
 +
The major work he did in his years at the University of Chicago after graduating was a series of [[ethology|ethological]] studies of sea birds done in the Dry Tortugas Islands in [[Florida]]. He studied all aspects of the birds' behavior: [[imprinting]], homing, mating, nesting habits, feeding, and chick-rearing. These extensive studies, carried out over four years, were some of the earliest examples of what would later be called "ethology," and his comprehensive records of the birds' behavior were some of the earliest examples of the "ethogram": a comprehensive record of the naturally occurring behavior of an organism.
  
 
=== Behaviorism ===
 
=== Behaviorism ===
 +
{{Main|Behaviorism}}
  
In 1913, Watson published what is sometimes considered his most important work, the article "Psychology as the Behaviorist Views It"sometimes called "The Behaviorist Manifesto."   In this article, Watson outlined the major features of his new philosophy of psychology, called "behaviorism." The first paragraph of the article concisely described Watson's behaviorist position:
+
In 1913, Watson published what is considered by many to be his most important work, the article "Psychology as the Behaviorist Views It," sometimes called "The Behaviorist Manifesto." In this article, Watson outlined the major features of his new philosophy of [[psychology]], called "behaviorism." The first paragraph of the article concisely described Watson's overall position:
  
<blockquote>
+
<blockquote>Psychology as the behaviorist views it is a purely objective experimental branch of natural science. Its theoretical goal is the prediction and control of behavior. Introspection forms no essential part of its methods, nor is the scientific value of its data dependent upon the readiness with which they lend themselves to interpretation in terms of consciousness. The behaviorist, in his efforts to get a unitary scheme of animal response, recognizes no dividing line between man and brute. The behavior of man, with all of its refinement and complexity, forms only a part of the behaviorist's total scheme of investigation.</blockquote>
Psychology as the behaviorist views it is a purely objective experimental branch of natural science. Its theoretical goal is the prediction and control of behavior. Introspection forms no essential part of its methods, nor is the scientific value of its data dependent upon the readiness with which they lend themselves to interpretation in terms of consciousness. The behaviorist, in his efforts to get a unitary scheme of animal response, recognizes no dividing line between man and brute. The behavior of man, with all of its refinement and complexity, forms only a part of the behaviorist's total scheme of investigation.
 
</blockquote>
 
  
The "manifesto" is notable for its lack of reference to specific principles of behavior. Watson's behaviorism is typically considered a historical descendent of [[Empiricism|British empiricism]], and particularly the views of [[John Locke]].  However, Watson said nothing substantive about these things.  His philosophy of science is more accurately traced to the history of experimental physiology through the influence of Loeb.  The reflex studies of [[Ivan M. Sechenov]] (1829-1905) and [[Vladimir Bekhterev]] (1857-1927) were particularly influential. Watson became interested in the work of [[Ivan Pavlov]] (1849-1936) later, and eventually included a highly simplified version of Pavlov's principles in his popular works.In 1913, Watson viewed [[Ivan Pavlov]]'s [[conditioned reflex]] as being primarily a physiological mechanism controlling glandular secretions.  He had already rejected [[Edward L. Thorndike]]'s "[[Law of Effect]]," a precursor to [[B. F. Skinner]]'s principle of [[reinforcement]], due to what Watson believed were unnecessary subjective elements.  It was not until 1916 that Watson would recognize the more general significance of Pavlov's formulation and make it the subject of his presidential address to the [[American Psychological Association]].  The lack of a specific mechanism of behavior caused Watson's colleagues to dismiss "Psychology as the Behaviorist Views It" as philosophical speculation without much foundation.  The article only became well-known to psychologists generally after it started to be widely cited in introductory psychology textbooks in the 1950s.  The article is also notable for its strong defense of the objective scientific status of applied psychology, which at the time was considered to be much inferior to the established [[structuralist]] experimental psychology.
+
Watson's philosophy of science was shaped by many sources. The history of experimental [[physiology]] taught to him by Loeb was one important influence, in particular the reflex studies of Ivan M. Sechenov and [[Vladimir Bekhterev]]. The work of [[Ivan Pavlov]], especially his [[conditioning|conditioned reflex]] studies, had a large impact on Watson, and he eventually included a highly simplified version of Pavlov's principles in his popular works. In 1916, Watson even made Pavlov's formulation the subject of his presidential address to the [[American Psychological Association]].  
  
With his behaviorism, Watson put the emphasis on external behaviour of people and their reactions on given situations, rather than the internal, [[Mental status examination|mental state]] of those people. In his opinion, the analysis of behaviours and reactions was the only objective method to get insight in the human actions.
+
Watson's behaviorist "manifesto" is notable for its lack of reference to specific principles of behavior. This caused many of Watson's colleagues to dismiss "Psychology as the Behaviorist Views It" as philosophical speculation without much foundation. The article only became well-known to psychologists generally after it started to be widely cited in introductory psychology textbooks in the 1950s. The article is notable for its strong defense of the objective scientific status of [[applied psychology]], which at the time was considered to be much inferior to the established structuralist [[experimental psychology]].
 +
 
 +
With his development of behaviorism, Watson put the emphasis on the external behavior of people and their reactions in given situations, rather than on their internal, mental state. In his opinion, the analysis of behaviors and reactions was the only objective method to gain insight in the human actions. Behaviorism influenced many important scientists, especially [[B.F. Skinner]], who would go on to test Watson's theories and develop his own theory of operant conditioning.
  
 
=== Little Albert experiment ===
 
=== Little Albert experiment ===
  
At [[Johns Hopkins University]] in 1920, Watson and Rayner performed one of the most controversial experiments in the history of psychology. It has become immortalized in introductory psychology textbooks as the [[Little Albert experiment]]. The goal of the experiment was to show empirical evidence of [[classical conditioning]] by developing "[[Little Albert experiment|Little Albert's]]" fear of a white rat. As the story of Little Albert has made the rounds, inaccuracies and inconsistencies have crept in, some of them even due to Watson himself; see Harris for an analysis. Albert was 11 months and three days old at the time of the first test. Because of his young age, the experiment would be considered unethical today. Since this experiment, and others which pushed the boundaries of experimental ethics, the [[American Psychological Association]] has banned studies considered unethical.
+
At [[Johns Hopkins University]] in 1920, Watson and Rayner performed one of the most controversial experiments in the history of psychology. It has become immortalized in introductory psychology textbooks as the "Little Albert experiment." The goal of the experiment was to provide empirical evidence of [[conditioning|classical conditioning]] by developing "Little Albert's" fear of a white rat.  
The controversy about this experiment is actually a modern development. There seemed to be little concern about it in Watson's time. Dewsbury reports that Watson received greater criticism from early animal rights groups over some of his experiments with rats, particularly a 1907 study, "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White Rat to the Maze."
+
 
 +
As the story of Little Albert became well known, inaccuracies and inconsistencies and rumors crept in (see Harris 1979 for an analysis). Albert was 11 months and three days old at the time of the first test. Because of his young age, the experiment was later considered unethical. Since this experiment, the [[American Psychological Association]] has published much stronger [[ethics|ethical]] guidelines, rendering it unrepeatable. The controversy surrounding this experiment actually developed much later. There seemed to be little concern about it in Watson's time. Dewsbury (1990) reported that Watson received greater criticism from early animal rights groups over some of his experiments with rats, particularly a 1907 study, "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White Rat to the Maze."
  
 
====Methodology====
 
====Methodology====
Before the start of the experiment, when Albert was 9 months old, Watson and Rayner ran him through emotional tests. The infant was confronted with many new objects and animals, and at no time showed any fear. When the actual experiment began, Watson exposed Albert to a loud sound right behind his head while also presenting him with a white rat. Originally, before Albert cried or screamed he thrust his thumb into his mouth. This  made him forget about the loud sound. It took more than 30 times for Watson to finally take Albert's thumb out to get the required reaction. First Albert was exposed to a rat. The second time, a week later, after a series of testing, Albert was able to cry by only being presented with the rat. Five days later, Albert showed generalization by reacting to a dog, a fur coat, Watson's hair, cotton wool and other objects. Unfortunately, Albert was taken from the hospital the day the last tests were made. Hence the opportunity of developing an experimental technique for removing the Conditioned Emotional Response was denied.
+
Before the start of the experiment, when Albert was 9 months old, Watson and Rayner ran a series of [[emotion]]al tests on him. The infant was confronted with many new objects and animals, and at no time showed any fear. When the actual experiment began, Watson exposed Albert to a loud sound right behind his head while also presenting him with a white rat. After obtaining the required reaction of discomfort and crying from Albert when he was exposed to both the sound and the rat simultaneously, Watson and Rayner presented him solely with the rat. A week later, after a series of testing, Albert was able to cry by being exposed to only the rat. Five days later, Albert showed generalization by reacting to a dog, a fur coat, Watson's hair, cotton wool, and other objects. Thus, Watson showed how it was possible to condition a fear response into a child. Unfortunately, Albert was taken from the hospital the day the last tests were made. Hence, the opportunity of developing an experimental technique for removing the conditioned emotional response was denied.
 +
 
 +
=== Views on childrearing ===
 +
 
 +
Although he wrote extensively on childrearing in many popular magazines and in a book, "Psychological Care of Infant and Child" (1928), he later regretted having written in the area. He has been quoted as saying that he "did not know enough" about the subject to speak with authority.  
  
=== Views on child rearing ===
+
Watson's advice to treat children with respect but relative emotional detachment has been strongly criticized. This perspective was also associated with [[psychoanalysis|psychoanalytic]] thinkers who worried that too much emotional attachment in childhood would lead to overly dependent adults. This overlap of Watson's ideas about childrearing with [[Sigmund Freud]] and other early psychoanalysts remains an unexamined aspect of his behaviorism.
  
Although he wrote extensively on childrearing in many popular magazines and in a book, "Psychological Care of Infant and Child" (1928), he later regretted having written in the area saying that "he did not know enough" to do a good job.  Watson's advice to treat children with respect, but with relative emotional detachment, has been strongly criticized.  But this perspective was not unique to Watson. It is also associated with [[psychoanalysis|psychoanalytic]] thinkers who worried that too much emotional attachment in childhood would lead to overly dependent adults.  (Watson's borrowing from [[Sigmund Freud]] and other early psychoanalysts remains an unexamined aspect of his behaviorism.)  Not commonly mentioned by modern critics is that Watson warned strongly against the use of spanking and other [[corporal punishment]], and advised parents that [[masturbation]] was not psychologically dangerous. The 1920s and 1930s were an age in which some childrearing books still instructed parents to pin down their infants' sleeves to prevent supposedly dangerous 'infantile masturbation," and described methods of spanking that would leave few or no marks.
+
Also seldom mentioned by modern critics is the fact that Watson warned strongly against the use of spanking and other [[corporal punishment]], and advised parents that [[masturbation]] was not psychologically dangerous. The 1920s and 1930s were an age in which some childrearing books still instructed parents to pin down their infants' sleeves to prevent supposedly dangerous "infantile masturbation," and descriptions of methods of spanking that would leave few or no marks were common.
  
 
=== Advertising ===
 
=== Advertising ===
  
Thanks to contacts provided by an academic colleague, Watson subsequently began working for U.S. [[advertising agency]] J. Walter Thompson. He learned the advertising business' many facets at ground level, including a stint working as a shoe salesman in an upscale department store. Despite this modest start, in less than two years Watson had risen to a vice-presidency at Thompson. His executive's salary, plus bonuses from various successful ad campaigns, resulted in an income many times higher than his academic salary.  Watson headed a number of high-profile advertising campaigns, particularly for Ponds cold cream and other personal-care products. He has been widely but erroneously credited with re-introducing the "testimonial" advertisement after the tool had fallen out of favor (due to its association with ineffective and dangerous [[patent medicines]]).  However, testimonial advertisements had been in use for years before Watson entered advertising. Watson stated that he was not making original contributions, but was just doing what was normal practice in advertising.   A large body of rumors circulate about Watson's dismissal from the J. Walter Thompson agency, particularly that Watson was fired for conducting research on the human sexual response with Rosalie  Rayner.  No evidence for these rumors has publicly surfaced. The stories can be directly traced to fanciful, highly anachronistic stories about Watson included by the late [[University of Michigan]] psychologist [[James McConnell]] (in several editions of his "Understanding Human Behavior" textbook, and his "Worms and Things" newsletter.)
+
After resigning from [[Johns Hopkins University]], Watson began working for the American [[advertising]] agency of J. Walter Thompson. He learned the many facets of the advertising business at ground level, even working as a shoe salesman in an upscale department store. Despite this modest start, in less than two years Watson had risen to a vice-presidency at Thompson. Watson headed a number of high-profile advertising campaigns, for example for various personal-care products.  
 +
 
 +
He has been widely, but erroneously, credited with reintroducing the "testimonial" advertisement. This method had fallen out of favor due to its association with ineffective and dangerous patent medicines, but testimonial advertisements had still been in use for years before Watson entered the field. Watson stated that he was not making original contributions, merely doing what was normal practice in advertising.
  
 
==Legacy==
 
==Legacy==
Line 60: Line 73:
 
=== The "twelve infants" quote ===
 
=== The "twelve infants" quote ===
  
Eventually, Watson's penchant for strong rhetoric would overshadow his science. He is famous for boasting, facetiously, that he could take any 12 [[human]] [[infant]]s, and by applying behavioral techniques, create whatever kind of person ("beggarman and thief") he desired. Naturally, he admitted that this claim was far beyond his means and data&mdash;noting, pointedly, that others had made similarly extravagant claims about the power of heredity over behavior for thousands of years. The quote, probably Watson's most well-known, reads:
+
Eventually, Watson's penchant for strong rhetoric would overshadow his scientific contributions. He is famous for boasting that he could take any 12 human infants, and by applying behavioral techniques, create whatever kind of person he desired. Naturally, he admitted that this claim was far beyond his means and data, noting, pointedly, that others had made similarly extravagant claims about the power of [[heredity]] over experience for thousands of years. The quote, probably Watson's most well-known for, reads:
  
<blockquote>
+
<blockquote>Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select—doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors. I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years (1930).</blockquote>
Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select – doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors. I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years. (1930)
 
</blockquote>
 
  
The last sentence is usually left out, making Watson's position more radical than it actually was. Watson had, in fact, done extensive ethological studies of the instinctive behavior of animals early in his career, particularly sea birds.  Nevertheless, Watson strongly sided with nurture in the [[nature versus nurture]] discussion.
+
The last sentence is usually left out, making Watson's position more radical than it actually was. Nevertheless, Watson stood strongly on the side of nurture in the "nature versus nurture" discussion.
  
===Impact of Behaviorism===
+
===Accomplishments===
 +
Despite the notoriety and controversy surrounding John B. Watson and his works, he made many important contributions to the scientific community during his lifetime. In publishing the first modern scientific book on rat behavior and some of the earliest examples of [[ethology]] and ethograms, he was the catalyst for many important developments in the field of animal research. And, although his works on childrearing were strongly criticized, he was still an important voice in the national debate in how children should be treated. He also had a large impact on American [[culture]] through his work in [[advertising]]. And, finally, in what is perhaps his most enduring contribution, he established the [[psychology|psychological]] school of [[behaviorism]], which changed the face of the psychological landscape in the twentieth century and influenced many important researchers in the [[social science]]s and beyond.
  
==References==
+
==Major Works==
* Watson, John B. & Rayner, Rosalie (1920). "Conditioned emotional reactions". ''Journal of Experimental Psychology'', 3(1), pp. 1-14. (The little Albert study, [http://psychclassics.yorku.ca/Watson/emotion.htm on-line])
 
  
* Harris, Ben. "Whatever Happened to Little Albert?" ''American Psychologist'', February 1979, Volume 34, Number 2, pp. 151-160. ([http://htpprints.yorku.ca/archive/00000198/01/BHARRIS.HTM on-line])
+
*Watson, John B. 1907. "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White rat to the Maze." ''Psychological Review Monograph Supplement'' 8(33): 1–100.
::Abstract: "Using published sources, this article reviews the study's actual procedures and its relationship to Watson's career and work. The article also presents a history of psychologists' accounts of the Albert study, focusing on the [[Bad science|study's distortion]] by Watson himself, general textbook authors, behavior therapists, and most recently, a prominent learning theorist. The author proposes possible causes for these distortions and analyzes the Albert study as an example of myth making in the [[history of psychology]]."
+
*Watson, John B. 1908. "The Behavior of Noddy and Sooty Terns." ''Carnegie Institute Publication'' 103: 197–255.
 +
*Watson, John B. 1913. "Psychology as the Behaviorist Views It." ''Psychological Review'' 20: 158–177.
 +
*Watson, John B. 1914. ''Behavior: An introduction to comparative psychology.'' Henry Holt.
 +
*Watson, John B. 1915. "Recent experiments with homing birds." ''Harper's Magazine'' 131: 457–464.
 +
*Watson, John B. 1919. ''Psychology from the standpoint of a behaviorist.''
 +
*Watson, John B., and Rosalie Rayner. 1920. [http://psychclassics.yorku.ca/Watson/emotion.htm "Conditioned emotional reactions."] ''Journal of Experimental Psychology'' 3(1): 1–14.
 +
*Watson, John B. 1928. ''Psychological Care of Infant and Child.''
 +
*Watson, John B. 1930. ''Behaviorism.'' University of Chicago Press.
 +
*Watson, John B. 1936. "John Broadus Watson [Autobiography]." ''A History of Psychology in Autobiography'' 3: 271–281. Clark University Press.
  
==External links==
+
==References==
  
* [http://psychclassics.yorku.ca/Watson/views.htm Psychology as the behaviorist views it (1913)]. Watson, John B., ''Psychological Review'', 20, pp. 158-177.
+
*Harris, Ben. 1979. [http://htpprints.yorku.ca/archive/00000198/01/BHARRIS.HTM "Whatever Happened to Little Albert?"] ''American Psychologist'' 34(2): 151–160.
 +
*Watson, John B. 1913. [http://psychclassics.yorku.ca/Watson/views.htm "Psychology as the behaviorist views it."] ''Psychological Review'' 20: 158–177.
 +
*Watson, John B., and Rosalie Rayner. 1920. [http://psychclassics.yorku.ca/Watson/emotion.htm "Conditioned emotional reactions (The Little Albert study)."] ''Journal of Experimental Psychology'' 3(1): 1–14.
  
* [http://psychclassics.yorku.ca/Watson/emotion.htm Conditioned emotional reactions (The Little Albert study, 1920).] Watson, John B. & Rayner, Rosalie, ''Journal of Experimental Psychology'', 3(1), pp. 1-14.
+
== Further reading ==
  
* [http://facweb.furman.edu/dept/psychology/watson1.htm John B. Watson. His Life in Words and Pictures] - Furman University Psychology Department
+
*Buckley, Kerry W. 1989. ''Mechanical Man: John Broadus Watson and the Beginnings of Behaviorism.'' Guilford Press. ISBN 0898627443
 +
*Buckley, Kerry W. 1994. "Misbehaviorism: The Case of John B. Watson's Dismissal from Johns Hopkins University." ''Modern Perspectives on John B. Watson and Classical Behaviorism.'' Greenwood Press.
 +
*Burnham, John C. 1994. "John B. Watson: Interviewee, Professional Figure, Symbol." ''Modern Perspectives on John B. Watson and Classical Behaviorism.'' Greenwood Press.
 +
*Coon, Deborah J. 1994. "'Not a Creature of Reason': The Alleged Impact of Watsonian Behaviorism on Advertising in the 1920s." ''Modern Perspectives on John B. Watson and Classical Behaviorism.'' Greenwood Press.
 +
*Curtis, H. S. 1899. "Automatic Movements of the Larynx." ''American Journal of Psychology'' 11: 237–239.
 +
*Dewsbury, Donald A. 1990. "Early interactions between animal psychologists and animal activists and the founding of the APA committee on precautions in animal experimentation." ''American Psychologist'' 45: 315–327.
 +
*Hartley, Mariette, and Anne Commire. 1990. ''Breaking the Silence.'' New York: G.P. Putnam's Sons. ISBN 0399135839
 +
*Samelson, F. 1981. "Struggle for Scientific Authority: The Reception of Watson's Behaviorism, 1913–1920." ''Journal of the History of the Behavioral Sciences'' 17: 399–425.
 +
*Todd, James T., and Edward K. Morris. 1986. "The Early Research of John B. Watson: Before the Behavioral Revolution." ''The Behavior Analyst'' 9: 71–88.
 +
*Todd, James T. 1994. "What Psychology Has to Say About John B. Watson: Classical Behaviorism in Psychology Textbooks, 1920–1989." ''Modern Perspectives on John B. Watson and Classical Behaviorism.'' Greenwood Press.
 +
*Todd, James T., and Edward K. Morris. 1994. ''Modern Perspectives on John B. Watson and Classical Behaviorism.'' Greenwood Press.
 +
*Wyczoikowska, A. 1913. "Theoretical and experimental studies in the mechanism of speech." ''Psychological Review'' 20: 448–458.
  
* [http://www.jhu.edu/~jhumag/0400web/35.html It's All in the Upbringing] - A biographical sketch of Watson's life and work on the website of Johns Hopkins University, where he was Professor of Psychology until 1920.
+
==External links==
 
+
All links retrieved August 3, 2022.
* [http://robothink.blogspot.com/2005/09/long-dark-night-of-behaviorism.html The Long Dark Night of Behaviorism] - An account of the consequences of John B. Watson's childrearing methods for his own children and his granddaughter, actress [[Mariette Hartley]].
 
 
 
== Further reading ==
 
 
 
*Buckley, Kerry W.  "Mechanical Man: John Broadus Watson and the Beginnings of Behaviorism."  Guilford Press, 1989.
 
*Buckley, Kerry W.  "Misbehaviorism: The Case of John B. Watson's Dismissal from Johns Hopkins University."  In J.T. Todd & E.K. Morris,  "Modern Perspectives on John B. Watson and Classical Behaviorism." Greenwood Press, 1994.
 
*Burnham, John C.  (1994).  "John B. Watson: Interviewee, Professional Figure, Symbol."  In J.T. Todd & E.K. Morris,  "Modern Perspectives on John B. Watson and Classical Behaviorism." Greenwood Press, 1994.
 
*Coon, Deborah J.  "'Not a Creature of Reason': The Alleged Impact of Watsonian Behaviorism on Advertising in the 1920s." In J.T. Todd & E.K. Morris,  "Modern Perspectives on John B. Watson and Classical Behaviorism." Greenwood Press, 1994.
 
* Curtis, H. S. (1899/1900). "Automatic Movements of the Larynx."  "American Journal of Psychology," 11, 237-39.
 
*Dewsbury, Donald A. (1990). "Early interactions between animal psychologists and animal activists and the founding of the APA committee on precautions in animal experimentation. American Psychologist," 45, 315-27.
 
* Harris, Ben. "Whatever Happened to Little Albert?" ''American Psychologist'', February 1979, Volume 34, Number 2, pp. 151-160. ([http://htpprints.yorku.ca/archive/00000198/01/BHARRIS.HTM on-line])
 
* Hartley, Mariette & Commire, Anne. ''Breaking the Silence.'' New York : G.P. Putnam's Sons, 1990. ([[Mariette Hartley]] is John B. Watson's granddaughter. Hartley claims in her autobiography that Watson's theories on childrearing blighted her childhood.)
 
* Samelson, F. (1981). "Struggle for Scientific Authority: The Reception of Watson's Behaviorism, 1913-1920." "Journal of the History of the Behavioral Sciences," 17, 399-425.
 
*Todd, James T.  "What Psychology Has to Say About John B. Watson: Classical Behaviorism in Psychology Textbooks, 1920-1989." In J.T. Todd & E.K. Morris,  "Modern Perspectives on John B. Watson and Classical Behaviorism." Greenwood Press, 1994.
 
*Todd, James T., & Morris, Edward K. (1986). "The Early Research of John B. Watson: Before the Behavioral Revolution." "The Behavior Analyst," 9, 71-88.
 
*Todd, James T., & Morris, Edward K.  "Modern Perspectives on John B. Watson and Classical Behaviorism."  Greenwood Press, 1994.
 
*Watson, John B. (1907). "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White rat to the Maze." "Psychological Review Monograph Supplement," 8(33), 1-100.
 
*Watson, John B. (1908). "The Behavior of Noddy and Sooty Terns." "Carnegie Institute Publication," 103, 197-255.
 
*Watson, John B. "Behavior: An introduction to comparative psychology." Henry Holt, 1914
 
*Watson, John B. (1915). "Recent experiments with homing birds." "Harper's Magazine," 131, 457-64.
 
*Watson, John B. "Behaviorism" (revised edition). University of Chicago Press, 1930.
 
*Watson, John B. "John Broadus Watson [Autobiography]." In C. Murchison (Ed.), "A History of Psychology in Autobiography" (Vol. 3, pp. 271-81). Clark University Press, 1936.
 
*Wyczoikowska, A. (1913). "Theoretical and experimental studies in the mechanism of speech." "Psychological Review," 20, 448-58.
 
  
 +
*[http://www.jhu.edu/~jhumag/0400web/35.html It's All in the Upbringing] – A biographical sketch of Watson's life and work – Pioneers of Scholarship
 +
*[http://robothink.blogspot.com/2005/09/long-dark-night-of-behaviorism.html The Long Dark Night of Behaviorism] – An account of the consequences of John B. Watson's childrearing methods for his own children and his granddaughter, actress Mariette Hartley.
  
 
{{Credit2|John_B._Watson|57255485|Little_Albert_experiment|57874183|}}
 
{{Credit2|John_B._Watson|57255485|Little_Albert_experiment|57874183|}}

Revision as of 04:13, 3 August 2022



John Broadus Watson (January 9, 1878 – September 25, 1958) was an American psychologist who established the psychological school of behaviorism. He did extensive research on animal behavior, but is perhaps best known for having claimed that he could take any 12 healthy infants and, by applying behavioral techniques, create whatever kind of person he desired. Watson also conducted the controversial "Little Albert" experiment, and his own personal life generated scandal. Nevertheless his work had great significance for the field of psychology, leading to the development of research methods and new understanding, despite its limitations.

Life

Early Life

John Broadus Watson was born in 1878 in Greenville, South Carolina, to Emma and Pickens Watson. His family was poor, and his father left them in 1891. A precocious but troublesome student, he entered Furman University in 1894, and graduated with a master’s degree at the age of 21.

After spending a year teaching grade school, he entered the University of Chicago to study philosophy with John Dewey. However, after studying with Dewey, Watson claimed not to understand his teaching, and he soon sought out a different academic path. He considered working on the physiology of the dog's brain with the radical biologist, Jacques Loeb, but later chose psychologist James Rowland Angell and physiologist Henry Donaldson as his advisors. His teachers were highly influential in his development of behaviorism, a descriptive, objective approach to the analysis of behavior.

In 1901, Watson married Mary Ickes, whom he had met at the University of Chicago. They had two children together, Mary and John. Watson graduated in 1903 with a Ph.D. in psychology, but stayed at the University of Chicago for several years doing research on the relationship between sensory input and learning and bird behavior. In 1907, at age 29, his reputation as a top researcher in animal behavior earned him a position at Johns Hopkins University as a professor of psychology.

Rosalie Rayner affair

In October 1920, Watson was asked to leave his faculty position at Johns Hopkins University due to an affair with his top research assistant, a graduate student named Rosalie Rayner. Both Rayner and Watson's wife, the sister of future Secretary of the Interior Harold L. Ickes, were members of prominent Baltimore political families. Not only was the Watsons' divorce that December front page news, but Baltimore papers also published excerpts from some of Watson's love letters to Rayner. Johns Hopkins president, Frank Goodnow, reportedly gave Watson a choice: his relationship with Rayner, or keeping his job at Hopkins. Watson's closeness to his research assistant, a woman half his age, was so strong that he resigned from Johns Hopkins and married Rayner in December 1920. They also had two children together, James and William.

Watson based many of his behaviorist studies on his children, which strained relationships within the family. With his affair with Rayner, he brought a scandal upon Johns Hopkins that was so great that his reputation among the U.S. academic elite was ruined. Consequently, Watson had to start over in a new career at the age of 42.

Later life

Watson stopped writing for popular audiences in 1936, and retired from advertising several years later. After Rosalie Rayner's death in 1935, he lived on a farm in Connecticut. He was rumored to have been a heavy drinker, but he actually gave up alcohol on the advice of his physician and enjoyed good health well into old age. He died in 1958 at age 80, shortly after receiving a citation from the American Psychological Association for his contributions to psychology. Historian John Burnham interviewed Watson late in his life, and reported him to still be a man of strong opinions and some bitterness towards his detractors. Except for a set of reprints of his academic works, Watson burned his very large collection of letters and personal papers, thus depriving historians of a valuable resource for understanding the early history of behaviorism and Watson himself.

Work

Studies on animal behavior

His dissertation from the University of Chicago, "Animal Education: An Experimental Study on the Psychical Development of the White Rat, Correlated with the Growth of its Nervous System," was the first modern scientific book on rat behavior. It has been described as a "classic of developmental psychobiology" by historian of psychology, Donald Dewsbury. "Animal Education" described the relationship between brain myelinization and learning ability in rats at different ages. Watson showed that the degree of myelinization was largely unrelated to learning ability.

The major work he did in his years at the University of Chicago after graduating was a series of ethological studies of sea birds done in the Dry Tortugas Islands in Florida. He studied all aspects of the birds' behavior: imprinting, homing, mating, nesting habits, feeding, and chick-rearing. These extensive studies, carried out over four years, were some of the earliest examples of what would later be called "ethology," and his comprehensive records of the birds' behavior were some of the earliest examples of the "ethogram": a comprehensive record of the naturally occurring behavior of an organism.

Behaviorism

Main article: Behaviorism

In 1913, Watson published what is considered by many to be his most important work, the article "Psychology as the Behaviorist Views It," sometimes called "The Behaviorist Manifesto." In this article, Watson outlined the major features of his new philosophy of psychology, called "behaviorism." The first paragraph of the article concisely described Watson's overall position:

Psychology as the behaviorist views it is a purely objective experimental branch of natural science. Its theoretical goal is the prediction and control of behavior. Introspection forms no essential part of its methods, nor is the scientific value of its data dependent upon the readiness with which they lend themselves to interpretation in terms of consciousness. The behaviorist, in his efforts to get a unitary scheme of animal response, recognizes no dividing line between man and brute. The behavior of man, with all of its refinement and complexity, forms only a part of the behaviorist's total scheme of investigation.

Watson's philosophy of science was shaped by many sources. The history of experimental physiology taught to him by Loeb was one important influence, in particular the reflex studies of Ivan M. Sechenov and Vladimir Bekhterev. The work of Ivan Pavlov, especially his conditioned reflex studies, had a large impact on Watson, and he eventually included a highly simplified version of Pavlov's principles in his popular works. In 1916, Watson even made Pavlov's formulation the subject of his presidential address to the American Psychological Association.

Watson's behaviorist "manifesto" is notable for its lack of reference to specific principles of behavior. This caused many of Watson's colleagues to dismiss "Psychology as the Behaviorist Views It" as philosophical speculation without much foundation. The article only became well-known to psychologists generally after it started to be widely cited in introductory psychology textbooks in the 1950s. The article is notable for its strong defense of the objective scientific status of applied psychology, which at the time was considered to be much inferior to the established structuralist experimental psychology.

With his development of behaviorism, Watson put the emphasis on the external behavior of people and their reactions in given situations, rather than on their internal, mental state. In his opinion, the analysis of behaviors and reactions was the only objective method to gain insight in the human actions. Behaviorism influenced many important scientists, especially B.F. Skinner, who would go on to test Watson's theories and develop his own theory of operant conditioning.

Little Albert experiment

At Johns Hopkins University in 1920, Watson and Rayner performed one of the most controversial experiments in the history of psychology. It has become immortalized in introductory psychology textbooks as the "Little Albert experiment." The goal of the experiment was to provide empirical evidence of classical conditioning by developing "Little Albert's" fear of a white rat.

As the story of Little Albert became well known, inaccuracies and inconsistencies and rumors crept in (see Harris 1979 for an analysis). Albert was 11 months and three days old at the time of the first test. Because of his young age, the experiment was later considered unethical. Since this experiment, the American Psychological Association has published much stronger ethical guidelines, rendering it unrepeatable. The controversy surrounding this experiment actually developed much later. There seemed to be little concern about it in Watson's time. Dewsbury (1990) reported that Watson received greater criticism from early animal rights groups over some of his experiments with rats, particularly a 1907 study, "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White Rat to the Maze."

Methodology

Before the start of the experiment, when Albert was 9 months old, Watson and Rayner ran a series of emotional tests on him. The infant was confronted with many new objects and animals, and at no time showed any fear. When the actual experiment began, Watson exposed Albert to a loud sound right behind his head while also presenting him with a white rat. After obtaining the required reaction of discomfort and crying from Albert when he was exposed to both the sound and the rat simultaneously, Watson and Rayner presented him solely with the rat. A week later, after a series of testing, Albert was able to cry by being exposed to only the rat. Five days later, Albert showed generalization by reacting to a dog, a fur coat, Watson's hair, cotton wool, and other objects. Thus, Watson showed how it was possible to condition a fear response into a child. Unfortunately, Albert was taken from the hospital the day the last tests were made. Hence, the opportunity of developing an experimental technique for removing the conditioned emotional response was denied.

Views on childrearing

Although he wrote extensively on childrearing in many popular magazines and in a book, "Psychological Care of Infant and Child" (1928), he later regretted having written in the area. He has been quoted as saying that he "did not know enough" about the subject to speak with authority.

Watson's advice to treat children with respect but relative emotional detachment has been strongly criticized. This perspective was also associated with psychoanalytic thinkers who worried that too much emotional attachment in childhood would lead to overly dependent adults. This overlap of Watson's ideas about childrearing with Sigmund Freud and other early psychoanalysts remains an unexamined aspect of his behaviorism.

Also seldom mentioned by modern critics is the fact that Watson warned strongly against the use of spanking and other corporal punishment, and advised parents that masturbation was not psychologically dangerous. The 1920s and 1930s were an age in which some childrearing books still instructed parents to pin down their infants' sleeves to prevent supposedly dangerous "infantile masturbation," and descriptions of methods of spanking that would leave few or no marks were common.

Advertising

After resigning from Johns Hopkins University, Watson began working for the American advertising agency of J. Walter Thompson. He learned the many facets of the advertising business at ground level, even working as a shoe salesman in an upscale department store. Despite this modest start, in less than two years Watson had risen to a vice-presidency at Thompson. Watson headed a number of high-profile advertising campaigns, for example for various personal-care products.

He has been widely, but erroneously, credited with reintroducing the "testimonial" advertisement. This method had fallen out of favor due to its association with ineffective and dangerous patent medicines, but testimonial advertisements had still been in use for years before Watson entered the field. Watson stated that he was not making original contributions, merely doing what was normal practice in advertising.

Legacy

The "twelve infants" quote

Eventually, Watson's penchant for strong rhetoric would overshadow his scientific contributions. He is famous for boasting that he could take any 12 human infants, and by applying behavioral techniques, create whatever kind of person he desired. Naturally, he admitted that this claim was far beyond his means and data, noting, pointedly, that others had made similarly extravagant claims about the power of heredity over experience for thousands of years. The quote, probably Watson's most well-known for, reads:

Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select—doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors. I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years (1930).

The last sentence is usually left out, making Watson's position more radical than it actually was. Nevertheless, Watson stood strongly on the side of nurture in the "nature versus nurture" discussion.

Accomplishments

Despite the notoriety and controversy surrounding John B. Watson and his works, he made many important contributions to the scientific community during his lifetime. In publishing the first modern scientific book on rat behavior and some of the earliest examples of ethology and ethograms, he was the catalyst for many important developments in the field of animal research. And, although his works on childrearing were strongly criticized, he was still an important voice in the national debate in how children should be treated. He also had a large impact on American culture through his work in advertising. And, finally, in what is perhaps his most enduring contribution, he established the psychological school of behaviorism, which changed the face of the psychological landscape in the twentieth century and influenced many important researchers in the social sciences and beyond.

Major Works

  • Watson, John B. 1907. "Kinaesthetic and Organic Sensations: Their Role in the Reactions of the White rat to the Maze." Psychological Review Monograph Supplement 8(33): 1–100.
  • Watson, John B. 1908. "The Behavior of Noddy and Sooty Terns." Carnegie Institute Publication 103: 197–255.
  • Watson, John B. 1913. "Psychology as the Behaviorist Views It." Psychological Review 20: 158–177.
  • Watson, John B. 1914. Behavior: An introduction to comparative psychology. Henry Holt.
  • Watson, John B. 1915. "Recent experiments with homing birds." Harper's Magazine 131: 457–464.
  • Watson, John B. 1919. Psychology from the standpoint of a behaviorist.
  • Watson, John B., and Rosalie Rayner. 1920. "Conditioned emotional reactions." Journal of Experimental Psychology 3(1): 1–14.
  • Watson, John B. 1928. Psychological Care of Infant and Child.
  • Watson, John B. 1930. Behaviorism. University of Chicago Press.
  • Watson, John B. 1936. "John Broadus Watson [Autobiography]." A History of Psychology in Autobiography 3: 271–281. Clark University Press.

References
ISBN links support NWE through referral fees

Further reading

  • Buckley, Kerry W. 1989. Mechanical Man: John Broadus Watson and the Beginnings of Behaviorism. Guilford Press. ISBN 0898627443
  • Buckley, Kerry W. 1994. "Misbehaviorism: The Case of John B. Watson's Dismissal from Johns Hopkins University." Modern Perspectives on John B. Watson and Classical Behaviorism. Greenwood Press.
  • Burnham, John C. 1994. "John B. Watson: Interviewee, Professional Figure, Symbol." Modern Perspectives on John B. Watson and Classical Behaviorism. Greenwood Press.
  • Coon, Deborah J. 1994. "'Not a Creature of Reason': The Alleged Impact of Watsonian Behaviorism on Advertising in the 1920s." Modern Perspectives on John B. Watson and Classical Behaviorism. Greenwood Press.
  • Curtis, H. S. 1899. "Automatic Movements of the Larynx." American Journal of Psychology 11: 237–239.
  • Dewsbury, Donald A. 1990. "Early interactions between animal psychologists and animal activists and the founding of the APA committee on precautions in animal experimentation." American Psychologist 45: 315–327.
  • Hartley, Mariette, and Anne Commire. 1990. Breaking the Silence. New York: G.P. Putnam's Sons. ISBN 0399135839
  • Samelson, F. 1981. "Struggle for Scientific Authority: The Reception of Watson's Behaviorism, 1913–1920." Journal of the History of the Behavioral Sciences 17: 399–425.
  • Todd, James T., and Edward K. Morris. 1986. "The Early Research of John B. Watson: Before the Behavioral Revolution." The Behavior Analyst 9: 71–88.
  • Todd, James T. 1994. "What Psychology Has to Say About John B. Watson: Classical Behaviorism in Psychology Textbooks, 1920–1989." Modern Perspectives on John B. Watson and Classical Behaviorism. Greenwood Press.
  • Todd, James T., and Edward K. Morris. 1994. Modern Perspectives on John B. Watson and Classical Behaviorism. Greenwood Press.
  • Wyczoikowska, A. 1913. "Theoretical and experimental studies in the mechanism of speech." Psychological Review 20: 448–458.

External links

All links retrieved August 3, 2022.

Credits

New World Encyclopedia writers and editors rewrote and completed the Wikipedia article in accordance with New World Encyclopedia standards. This article abides by terms of the Creative Commons CC-by-sa 3.0 License (CC-by-sa), which may be used and disseminated with proper attribution. Credit is due under the terms of this license that can reference both the New World Encyclopedia contributors and the selfless volunteer contributors of the Wikimedia Foundation. To cite this article click here for a list of acceptable citing formats.The history of earlier contributions by wikipedians is accessible to researchers here:

The history of this article since it was imported to New World Encyclopedia:

Note: Some restrictions may apply to use of individual images which are separately licensed.