|Born||Hans Jürgen Eysenck
4 March 1916
Berlin, German Empire
|Died||4 September 1997
|Institutions||Institute of Psychiatry|
|Alma mater||University College London (UCL)|
|Doctoral advisor||Cyril Burt|
|Doctoral students||Peter L. Broadhurst, Jeffrey Alan Gray, Donald Prell|
|Known for||intelligence, personality, Eysenck Personality Questionnaire,
differential psychology, education,
psychiatry, behaviour therapy
Hans Jürgen Eysenck (//; 4 March 1916 – 4 September 1997) was a psychologist born in Germany, who spent his professional career in Great Britain. He is best remembered for his work on intelligence and personality, though he worked in a wide range of areas. At the time of his death, Eysenck was the living psychologist most frequently cited in science journals.
- 1 Life
- 2 Views and their reception
- 3 Portraits
- 4 Biographies
- 5 Works
- 6 References
- 7 Further reading
- 8 External links
Eysenck was born in Berlin, Germany. His mother was Silesian-born film star Helga Molander, and his father, Eduard Anton Eysenck, was a nightclub entertainer who was once voted "handsomest man on the Baltic coast". (pp. 8–11). Eysenck was brought up by his maternal grandmother (his grandmother was a fervent Lutheran; after her death in a concentration camp, Eysenck found out that she "apparently" was from a Jewish family). (p. 80). An initial move to England in the 1930s became permanent because of his opposition to the Nazi party. "My hatred of Hitler and the Nazis, and all they stood for, was so overwhelming that no argument could counter it." (p. 40) Because of his German citizenship, he was initially unable to gain employment, and was almost interned during the war. He received his PhD in 1940 from University College, London (UCL) working in the Department of Psychology under the supervision of Professor Sir Cyril Burt, with whom he had a tumultuous professional relationship throughout his working life. (pp. 118–119).
Eysenck was Professor of Psychology at the Institute of Psychiatry, King's College, London (a constituent college of the federal University of London), from 1955 to 1983. He was a major contributor to the modern scientific theory of personality and a brilliant teacher who helped found treatment for mental illnesses. Eysenck also created and developed distinctive dimensional model of personality based on factor-analytic summaries, bravely attempting to anchor these summaries in biogenetic variation. He was the founding editor of the journal Personality and Individual Differences, and authored about 80 books and more than 1600 journal articles. His son Michael Eysenck is also a noted psychology professor. Hans Eysenck died of a brain tumour in a London hospice in 1997.
Views and their reception
Examples of publications in which Eysenck's views have roused controversy include (chronologically):
- A paper in the 1950s concluding that available data "fail to support the hypothesis that psychotherapy facilitates recovery from neurotic disorder".
- A chapter in Uses and Abuses of Psychology (1953) entitled "What is wrong with psychoanalysis".
- The Psychology of Politics (1954)
- Race, Intelligence and Education (1971) (in the US: The IQ Argument).
- Sex, Violence and the Media (1978).
- Astrology — Science or Superstition? (1982).
- Smoking, Personality and Stress (1991).
Eysenck’s attitude was summarised in his autobiography Rebel with a Cause (Transaction Publishers, 1997, ISBN 1-56000-938-1): "I always felt that a scientist owes the world only one thing, and that is the truth as he sees it. If the truth contradicts deeply held beliefs, that is too bad. Tact and diplomacy are fine in international relations, in politics, perhaps even in business; in science only one thing matters, and that is the facts." He was one of the signers of the Humanist Manifesto.
The Psychology of Politics
In this book, Eysenck suggests that political behaviour may be analysed in terms of two independent dimensions: the traditional left-right distinction, and how 'tenderminded' or 'toughminded' a person is. Eysenck suggests that the latter is a result of a person's introversion or extroversion respectively.
Colleagues criticised the research that formed the basis of this book, on a number of grounds, including the following.
- Eysenck claims that his findings can be applied to the British middle class as a whole, but the people in his sample were far younger and better educated than the British middle class as a whole.
- Supporters of different parties were recruited in different ways: Communists were recruited through party branches, fascists in an unspecified manner, and supporters of other parties by giving copies of the questionnaire to his students and telling them to apply it to friends and acquaintances.
- Scores were obtained by applying the same weight to groups of different sizes. For example the responses of 250 middle-class supporters of the Liberal Party were given the same weight as those of 27 working-class Liberals.
- Scores were rounded without explanation, in directions that supported Eysenck's theories.
Genetics and intelligence
By far the most acrimonious of the debates has been that over the role of genetics in IQ differences, which led to Eysenck being punched on the nose by a protestor during a talk at the London School of Economics, as well as bomb threats, and threats to kill his young children. This opposition came when he supported Arthur Jensen's questioning of whether variation in IQ between racial groups was entirely environmental. (see race and intelligence).
Eysenck thought the media gave the misleading impression that his views were those of a maverick outside the mainstream scientific consensus and cited The IQ Controversy, the Media and Public Policy as showing that there was majority support for every single one of the main contentions he had put forward, further asserting that the idea there was any real debate about the matter among the relevant scientists was incorrect.
In the context of this controversy, S.A. Barnett describes Eysenck as a "prolific popularizer" and exemplifies Eysenck's writings on this topic with two passages from his early 1970s books:
All the evidence to date suggests the . . . overwhelming importance of genetic factors in producing the great variety of intellectual differences which we observe in our culture, and much of the difference observed between certain racial groups.—HJ Eysenck, Race, Intelligence and Education, 1971, London: Temple Smith, p. 130
the whole course of development of a child's intellectual capabilities is largely laid down genetically, and even extreme environmental changes . . . have little power to alter this development.—HJ Eysenck, The Inequality of Man, 1973, London: Temple Smith, pp. 111–12
Barnett quotes additional criticism of Race, Intelligence and Education from Sandra Scarr-Salapatek, who wrote in 1976 that Eysenck's book was "generally inflammatory" and that there "is something in this book to insult almost everyone except WASPs and Jews." Scarr was equally critical of Eysenck's hypotheses; one of which was Eysenck's supposition that slavery on plantations had selected African Americans as a less intelligent sub-sample of Africans. Scarr also criticised another statement of Eysenck on the alleged significantly lower IQs of Italian, Spanish, Portuguese and Greek immigrants in the US relative to the populations in their country of origin. "Although Eysenck is careful to say that these are not established facts (because no IQ tests were given to the immigrants or nonimmigrants in question?" Scarr writes that the careful reader would conclude that "Eysenck admits that scientific evidence to date does not permit a clear choice of the genetic-differences interpretation of black inferiority on intelligence tests," whereas a "quick reading of the book, however, is sure to leave the reader believing that scientific evidence today strongly supports the conclusion that US blacks are genetically inferior to whites in IQ."
Effects of smoking
He also received "secret" funding for "consultation research" via New York legal firm Jacob & Medinger, which was acting on behalf of the tobacco industry. Asked what he felt about tobacco industry lawyers being involved in selecting scientists for research projects, he said: "As long as somebody pays for the research I don't care who it is." Research should be judged on quality, not on who paid for it, he said, adding that he had not personally profited from the funds. According to the UK newspaper The Independent, Eysenck received more than £800k in this way – though, when interviewed by UK's Channel 4 TV in 1996, he "could not remember exactly the source" of the money.
Genetics of personality
In 1951, Eysenck's first empirical study into the genetics of personality was published. It was an investigation carried out with his student and associate Donald Prell, from 1948 to 1951, in which identical (monozygotic) and fraternal (dizygotic) twins, ages 11 and 12, were tested for neuroticism. It is described in detail in an article published in the Journal of Mental Science. Eysenck and Prell concluded: "that the factor of neuroticism is not a statistical artifact, but constitutes a biological unit which is inherited as a whole....neurotic predisposition is to a large extent hereditarily determined."
Model of personality
The two personality dimensions, extraversion and neuroticism, were described in his 1947 book Dimensions of Personality. It is common practice in personality psychology to refer to the dimensions by the first letters, E and N.
E and N provided a two-dimensional space to describe individual differences in behaviour. An analogy can be made to how latitude and longitude describe a point on the face of the earth. Also, Eysenck noted how these two dimensions were similar to the four personality types first proposed by the Greek physician Hippocrates.
- High N and high E = Choleric type
- High N and low E = Melancholic type
- Low N and high E = Sanguine type
- Low N and low E = Phlegmatic type
The third dimension, psychoticism, was added to the model in the late 1970s, based upon collaborations between Eysenck and his wife, Sybil B. G. Eysenck (e.g., Eysenck & Eysenck, 1976), who is the current editor of Personality and Individual Differences.
The major strength of Eysenck's model was to provide detailed theory of the causes of personality. For example, Eysenck proposed that extraversion was caused by variability in cortical arousal: "introverts are characterized by higher levels of activity than extraverts and so are chronically more cortically aroused than extraverts". Similarly, Eysenck proposed that location within the neuroticism dimension was determined by individual differences in the limbic system. While it seems counterintuitive to suppose that introverts are more aroused than extraverts, the putative effect this has on behaviour is such that the introvert seeks lower levels of stimulation. Conversely, the extravert seeks to heighten his or her arousal to a more favourable level (as predicted by the Yerkes-Dodson Law) by increased activity, social engagement and other stimulation-seeking behaviours.
Comparison with other theories
Jeffrey Alan Gray, a former student of Eysenck's, developed a comprehensive alternative theoretical interpretation (called Gray's biopsychological theory of personality) of the biological and psychological data studied by Eysenck – leaning more heavily on animal and learning models. Currently, the most widely used model of personality is Big Five model (Costa & McCrae, 1985). The traits in the Big Five are as follows:
- "Openness to experience"
Extraversion and Neuroticism in the Big Five are very similar to Eysenck's traits of the same name. However, what he calls the trait of Psychoticism corresponds to two traits in the Big Five model: Conscientiousness and Agreeableness (Goldberg & Rosalack 1994). Eysenck's personality system did not address Openness to experience. He argued that his approach was a better description of personality (Eysenck, 1992a; 1992b).
Eysenck's theory of personality is closely linked with the scales that he and his co-workers developed. These include the Maudsley Medical Questionnaire, Eysenck Personality Inventory (EPI), Eysenck Personality Questionnaire (EPQ) and Sensation Seeking Scale (developed in conjunction with Marvin Zuckerman). The Eysenck Personality Profiler (EPP) breaks down different facets of each trait considered in the model. There has been some debate about whether these facets should include impulsivity as a facet of extraversion as Eysenck declared in his early work; or psychoticism. Eysenck declared for the latter, in later work.
Publication in far right-wing press
Eysenck was accused of being a supporter of the extreme right. Connecting arguments were that Eysenck had articles published in the German newspaper National Zeitung, which called him contributor, and in Nation und Europa, and that he wrote the preface to the book Das unvergängliche Erbe by Pierre Krebs, a far-right French writer, which was published by Krebs' Thule Seminar. The preface to Krebs' book was interpreted by linguist Siegfried Jäger as having "railed against the equality of people, presenting it as an 'untenable ideological doctrine'". In the National Zeitung Eysenck reproached Sigmund Freud for alleged trickiness and lack of frankness and referred to Freud's Jewish background. Other incidents that fuelled Eysenck's critics like Michael Billig and Steven Rose include the appearance of Eysenck's books on UK National Front's list of recommended readings and an interview with Eysenck published by National Front's Beacon (1977) and later republished in the US neo-fascist Steppingstones; a similar interview had been published a year before by Neue Anthropologie, described by Eysenck's biographer Roderick Buchanan as a "sister publication to Mankind Quarterly, having similar contributors and sometimes sharing the same articles." Eysenck also wrote an introduction for Roger Pearson's Race, Intelligence and Bias in Academe; Pearson was himself accused of having published numerous racist works and of connections to the old and new right. In this introduction to Pearson's book, Eysenck retorts that his critics are "the scattered troops" of the New Left, who have adopted the "psychology of the fascists". Eysenck book The Inequality of Man, translated in French as L'Inegalite de l'homme, was published by GRECE's publishing house, Éditions Corpernic. In 1974 Eysenck became a member of the academic advisory council of the Mankind Quarterly, joining those associated with the journal in attempting to reinvent it as a more mainstream academic vehicle. Billig asserts that in the same year Eysenck also became a member of the comité de patronage of GRECE's Nouvelle École.
Remarking on Eysenck's alleged right-wing connections, Buchanan writes: "For those looking to thoroughly demonize Eysenck, his links with far right groups revealed his true political sympathies." According to Buchanan, these harsh critics interpreted Eysenck's writings as "overtly racist". Furthermore, Buchanan writes that Eysenck's fiercest critics were convinced that Eysenck was "willfully misrepresenting a dark political agenda". Buchanan footnotes this observation with a quote from William Tucker who described Eysenck as "Jensen's dark doppelganger". Buchanan however disagrees with this stark interpretation: "Yet the tip-of-the-iceberg metaphor implicit in this accusation appears to be seriously misleading in Eysenck's case. More than most, what you saw was what you got. He spread himself too thin to be harbouring much beneath the surface." Buchanan goes on to argue that Eysenck's research was thinly spread across numerous domains to conclude that "There appeared to be no hidden agenda to Hans Eysenck. He was too self-absorbed, too preoccupied with his own aspirations as a great scientist to harbor specific political aims."
Buchanan then addresses Eysenck's handling of his public image in this matter: "Harder to brush off was the impression that Eysenck was insensitive, even willfully blind to the way his work played out in a wider political context. He did not want to believe, almost to the point of utter refusal, that his work gave succor to right-wing racialist groups. But there is little doubt that Jensen and Eysenck helped revive the confidence of these groups. [...] It was unexpected vindication from a respectable scientific quarter. The cautionary language of Eysenck's interpretation of the evidence made little difference. To the racialist right, a genetic basis for groups differences in intelligence bore out racialist claims of inherent, immutable hierarchy." Buchanan exemplifies Eysenck's cautionary approach with a number of concrete examples from Eysenck's writings, and concludes that "If the appropriation of his work by right-wing groups brought him baggage that would be hard to shake off, how then did he construe his relationship with them? Curiously enough, he saw himself as a kind of enlightened scientific shepherd, guiding the blinkered and ignorant toward more sensible positions. Good research would eventually help temper all social wrongs and excesses. The trouble for Eysenck was that empirical science was clearly taken to be part of the problem as well as the solution. Its very impartiality was itself held up to question. The lack of consensus on the technical issues fed open-ended arguments about truth, social justice, and how we should live. Thus the controversy ran on and on."
Eysenck's defence was that ultimately he did not shy away from publishing or being interviewed in controversial publications, and that he did not necessarily share their editorial viewpoint. Buchanan suggests that this may have been true in general, with an Eysenck interview appearing in Mayfair and several articles by Eysenck being published in Penthouse. In his autobiography, Eysenck answered his critics with: "It is odd, and indeed paradoxical, that my most determined opponents should have been people with whose aims I completely agreed." Regarding the equality of people, Eysenck wrote: “The major argument in modern times is between those who define equality in terms of social status, and those who define it in terms of equality of biological inheritance. Equality of social status has always been a socialist idea, and it is certainly possible to argue about its desirability, or the possibility of achieving it. Equality of biological abilities and traits is a chimera which no thinking person should entertain for one moment.” Eysenck stated his own views in the Introduction to Race, Education and Intelligence: "[…] the reader is consequently entitled to ask in which direction the writer's own political and social beliefs and attitudes go. […] My recognition of the importance of the racial problem, and my own attitudes of opposition to any kind of racial segregation, and hatred for those who suppress any sector of the community on grounds of race (or sex or religion) were determined in part by the fact that I grew up in Germany, at a time when Hitlerism was becoming the very widely held doctrine which finally prevailed and led to the deaths of several million Jews whose only crime was that they belonged to an imaginary 'race' which had been dreamed up by a group of men in whom insanity was mixed in equal parts with craftiness, paranoia with guile, and villainy with sadism. […]"
In 1994 he was one of 52 signatories on "Mainstream Science on Intelligence", an editorial written by Linda Gottfredson and published in the Wall Street Journal, which declared the consensus of the signing scholars on issues related to intelligence research following the publication of the book The Bell Curve. Gottfredson described the drafting of the statements on intelligence and process of gathering signatures on that document in a 1997 editorial in the journal Intelligence. Eysenck includes the entire text of the 1994 editorial (including the lead paragraphs mentioning The Bell Curve and twenty-five propositions about human intelligence) in his 1998 book Intelligence: A New Look, saying, "I did not find any particular discrepancies between my account" and the statements in that editorial.
Eysenck made early contributions to fields such as personality by express and explicit commitment to a very rigorous adherence to scientific methodology, as Eysenck believed that scientific methodology was required for progress in personality psychology. He used, for example, factor analysis, a statistical method, to support his personality model. An example is Inheritance of Neuroticism: An Experimental Study, quoted above. His early work showed Eysenck to be an especially strong critic of psychoanalysis as a form of therapy, preferring behaviour therapy. He was particularly critical of Freud and his methods and wrote a book criticising them entitled Decline and Fall of the Freudian Empire. Eysenck did not shy, in later work, from giving attention to parapsychology and astrology. Indeed, he believed that empirical evidence supported the existence of paranormal abilities.
- H. B. Gibson (Tony Gibson), who worked with Eysenck at the Institute of Psychiatry, published a biography of him.
- Eysenck's autobiography was published in 1990 and revised in 1997.
- A biography of Eysenck written by Roderick Buchanan was published by Oxford University Press in 2010: Buchanan, Roderick J. (2010). Playing with Fire: The Controversial Career of Hans J. Eysenck. Oxford: Oxford University Press. ISBN 978-0-19-856688-5. Lay summary (23 October 2010).
- Dimensions of Personality (1947)
- The Scientific Study of Personality (1952)
- The Structure of Human Personality (1952) and later editions
- Uses and Abuses of Psychology (1953)
- The Psychology of Politics (1954)
- Psychology and the Foundations of Psychiatry (1955)
- Sense and Nonsense in Psychology (1956)
- The Dynamics of Anxiety and Hysteria (1957)
- Perceptual Processes and Mental Illnesses (1957) with G. Granger and J. C. Brengelmann
- Manual of the Maudsley Personality Inventory (1959)
- Know Your Own I.Q. (1962)
- Crime and Personality (1964) and later editions
- Manual of the Eysenck Personality Inventory (1964) with S. B. G. Eysenck
- The Causes and Cures of Neuroses (1965) with S. Rachman
- Fact and Fiction in Psychology (1965)
- Smoking, Health and Personality (1965)
- Check Your Own I.Q. (1966)
- The Effects of Psychotherapy (1966)
- The Biological Basis of Personality (1967)
- Eysenck, H. J. & Eysenck, S. B. G. (1969). Personality Structure and Measurement. London: Routledge.
- Readings in Extraversion/Introversion (1971) three volumes
- Race, Intelligence and Education (1971) in US as The IQ Argument
- Psychology is about People (1972)
- Lexicon de Psychologie (1972) three volumes, with W. Arnold and R. Meili
- The Inequality of Man (1973). German translation Die Ungleichheit der Menschen. Munich: Goldman. 1978. With an introduction by Eysenck.
- Eysenck, Hans J.; Wilson, Glenn D. (1973). The Experimental Study of Freudian Theories. London: Methuen & Co Ltd (SBN 416780105).
- Eysenck, Hans J.; Wilson, Glenn D. (1976). Know your own personality. Harmondsworth, Eng. Baltimore etc: Penguin Books. ISBN 9780140219623.
- Manual of the Eysenck Personality Questionnaire (1975) with S. B. G. Eysenck
- Eysenck, Hans J.; Wilson, Glenn D. (1976). A Textbook of Human Psychology. Lancaster: MTP Press.
- Sex and Personality (1976)
- Eysenck, H. J. & Eysenck, S. B. G. (1976). Psychoticism as a Dimension of Personality. London: Hodder and Stoughton.
- Reminiscence, Motivation and Personality (1977) with C. D. Frith
- You and Neurosis (1977)
- Die Zukunft der Psychologie (1977)
- Eysenck, Hans J.; Nias, David K. B. (1979). Sex, violence, and the media. New York: Harper Collins. ISBN 9780060906849.
- The Structure and Measurement of Intelligence (1979)
- Eysenck, Hans J.; Wilson, Glenn D. (1979). The psychology of sex. London: J. M. Dent. ISBN 9780460043328.
- The Causes and Effects of Smoking (1980)
- Mindwatching (1981) with M. W. Eysenck, and later editions
- The Battle for the Mind (1981) with L. J. Kamin, in US as The Intelligence Controversy
- Personality, Genetics and Behaviour (1982)
- Explaining the Unexplained (1982, 2nd edition 1993) with Carl Sargent
- H. J. Eysenck & D. K. B. Nias, Astrology: Science or Superstition? Penguin Books (1982), ISBN 0-14-022397-5
- Know Your Own Psi-Q (1983) with Carl Sargent
- …'I Do'. Your Happy Guide to Marriage (1983) with B. N. Kelly
- Personality and Individual Differences: A Natural Science Approach (1985) with M. W. Eysenck
- Decline and Fall of the Freudian Empire (1985)
- Rauchen und Gesundheit (1987)
- The Causes and Cures of Criminality (1989) with G. H. Gudjonsson
- Genes, Culture and Personality: An Empirical Approach (1989) with L. Eaves and N. Martin
- Mindwatching (1989) with M. W. Eysenck. Prion, ISBN 1-85375-194-4
- Genius: The natural history of creativity (1995). Cambridge University Press, ISBN 0-521-48014-0
- Intelligence: A New Look (1998)
- Handbook of Abnormal Psychology (1960) editor, later editions
- Experiments in Personality (1960) two volumes, editor
- Behaviour Therapy and Neuroses (1960) editor
- Experiments with Drugs (1963) editor
- Experiments in Motivation (1964) editor
- Eysenck on Extraversion (1973) editor
- The Measurement of Intelligence (1973) editor
- Case Histories in Behaviour Therapy (1974) editor
- The Measurement of Personality (1976) editor
- Eysenck, Hans J.; Wilson, Glenn D. (1978). The Psychological basis of ideology. Baltimore: University Park Press. ISBN 9780839112211.
- A Model for Personality (1981) editor
- A Model for Intelligence (1982) editor*Suggestion and Suggestibility (1989) editor, with V. A. Gheorghiu, P. Netter, and R. Rosenthal*Personality Dimensions and Arousal (1987) editor, with J. Strelau
- Theoretical Foundations of Behaviour Therapy (1988) editor, with I. Martin
- Eysenck, H. J. (October 1952). "The Effects of Psychotherapy: An Evaluation". Journal of Consulting Psychology 16 (5): 319–324. doi:10.1037/h0063633. PMID 13000035.
- Eysenck, H. J. (1969). "The Rise of the Mediocracy". In Black Paper Two: The Crisis in Education (Critical Quarterly Society)
- Eysenck, H. J. (1987). "Thomson's 'bonds' or Spearman's 'energy': Sixty years on". Mankind Quarterly 27 (3): 259–274.
- Eysenck, H. J. "A Reply to Costa and McCrae. P or A and C—The Role of Theory". Personality and Individual Differences 13 (8): 867–868. doi:10.1016/0191-8869(92)90003-8.
- Eysenck, H. J. "Four ways five factors are not basic". Personality and Individual Differences 13 (6): 667–673. doi:10.1016/0191-8869(92)90237-J.
- Preface to Pierre Krebs. Das Unverganglich Erbe
- Haggbloom, S. J. (2002). "The 100 most eminent psychologists of the 20th century". Review of General Psychology 6: 139–152. doi:10.1037/1089-26220.127.116.11.
- Eysenck, Hans J., Rebel with a Cause (an Autobiography), London: W. H. Allen & Co., 1990
- Roderick D. Buchanan (2010). Playing With Fire: The Controversial Career of Hans J. Eysenck. Oxford University Press. pp. 25–30. ISBN 978-0-19-856688-5.
- "Hans Jurgen Eysenck Facts, information, pictures | Encyclopedia.com articles about Hans Jurgen Eysenck". Encyclopedia.com. Retrieved 22 July 2011.
- Behaviour Therapy and the Neurosis, edited by Hans Eysenck, London: Pergamon Press, 1960.
- Eysenck, Hans J., Experiments in Behaviour Therapy, London: Pergamon Press, 1964.
- Roderick D. Buchanan, "Looking back: the controversial Hans Eysenck", The Psychologist, Vol. 24, Part 4, April 2011.
- Honan, William H. (10 September 1997). "Hans J. Eysenck, 81, a Heretic in the Field of Psychotherapy". The New York Times. Retrieved 4 May 2010.
- "APA Presidents Remember: Hans Eysenck — Visionary Psychologist". Retrieved 13 November 2008.
- "Hans J. Eysenck". Retrieved 13 November 2008.
- "Classics in the History of Psychology – Eysenck (1957)". Psychclassics.yorku.ca. 23 January 1952. Retrieved 22 July 2011.
- "Humanist Manifesto II". American Humanist Association. Retrieved 3 October 2012.
- Altemeyer, Bob. Right Wing Authoritarianism (Manitoba: University of Manitoba Press, 1981) 80–91.
- Roger Pearson, Race, Intelligence and Bias in Academe, 2nd edition, Scott-Townsend (1997), ISBN 1-878465-23-6, pp. 34–38.
- Scientist or showman? – Archive – Mail & Guardian Online
- Race, Intelligence and Education, London: MT Smith, 1971.
- Eysenck, Hans J., Rebel with a Cause (an Autobiography), London: W. H. Allen & Co., 1990, pp. 289–291.
- BBC television series Face To Face • Hans Eysenck – broadcast 16 October 1990.
- S. A. Barnett (1988). Biology and Freedom: An Essay on the Implications of Human Ethology. Cambridge University Press. pp. 160–161. ISBN 978-0-521-35316-8.
- Sandra Scarr (1976). "Unknowns in the IQ equation". In Ned Joel Block and Gerald Dworkin. The I.Q. controversy: Critical readings. Pantheon Books. p. 114. ISBN 978-0-394-73087-5.
- Sandra Scarr (1976). "Unknowns in the IQ equation". In Ned Joel Block and Gerald Dworkin. The I.Q. controversy: Critical readings. Pantheon Books. p. 116. ISBN 978-0-394-73087-5.
- S. Scarr (1981). Race, Social Class, and individual Differences in I.q.. Psychology Press. pp. 62–65. ISBN 978-0-89859-055-5.
- Avner Falk. Anti-semitism: a history and psychoanalysis of contemporary hatred. Abc-Clio, 2008, p. 18.
- William H. Tucker, The Funding of Scientific Racism: Wickliffe Draper and the Pioneer Fund. University of Illinois Press, 2002.
- Andrew Wroe. The Republican party and immigration politics: from Proposition 187 to George W. Bush. University of Illinois Press, 2008, p. 81.
- "Grantees". Pioneerfund.org. Retrieved 22 July 2011.
- "The support of the Pioneer Fund is not limited to Jensen, Shockley, Pearson, Rushton, Gordon, and the Minnesota Project. The list of other recipients of Pioneer Fund grants reads partly like a "Who's Who" of scientific and political racism in the United States, Canada, Great Britain, and Ireland. Recipients include the American Immigration Control Federation [[sic| [sic]]], the Foundation of Human Understanding, Richard Lynn, professor of psychology at the University of Ulster, Eysenck's Institute of Psychiatry at the University of London, and Seymour Itzkoff of Smith College." Kühl, Stefan (1994). The Nazi Connection: Eugenics, American Racism, and German National Socialism. New York, NY: Oxford University Press.
- Example document here "Memorandum Regarding Professor Eysenck's Research Progress".
- Peter pringle, "Eysenck took pounds 800,000 tobacco funds", The Independent, 31 October 1996.
- The Journal of Mental Health, July 1951, Vol. XCVII, "The Inheritance of Neuroticism: An Experimental Study", H. J. Eysenck and D. B. Prell, p. 402.
- H. J. Eysenck and S. B. G. Eysenck (1976). Psychoticism as a Dimension of Personality. London: Hodder & Stoughton.
- (Eysenck & Eysenck, 1985)
- Thomas, Kerry. The individual differences approach to personality in Mapping Psychology, The Open University, 2007 p.315
- Christina Schori-Liang. Europe for the Europeans: The Foreign and Security Policy of the Populist Radical Right. Ashgate 2007. p.160.
- Siegfried Jäger. "Der Singer-Diskurs sowie einige Bemerkungen zu seiner Funktion für die Stärkung rassistischer und rechtsextremer Diskurse in der Bundesrepublik Deutschland ". First appeared in Siegfried Jäger and Jobst Paul (1991). Von Menschen und Schweinen. Der Singer-Diskurs und seine Funktion für den Neo-Rassismus. Duisburg: Diss-Texte Nr. 13. p. 7-30. ISBN 3885151219. Quotation: "Eysenck stellt sich zudem rückhaltlos hinter rechtsextreme Theorie-Zirkel wie z.B. das Kasseler Thule-Seminar. Zu dem von dessen Leiter herausgegebenen Buch mit dem Titel “Das unvergängliche Erbe” verfaßte er das Vorwort, in dem er gegen die Gleichheit der Menschen wettert, indem er sie als “unhaltbare ideologische Doktrin” abtut. (in Krebs 1981, S. 12)"
- Roderick D. Buchanan (2010). Playing With Fire: The Controversial Career of Hans J. Eysenck. Oxford University Press. pp. 324–326. ISBN 978-0-19-856688-5.
- Bruce Lincoln (2000). Theorizing Myth: Narrative, Ideology, and Scholarship. University of Chicago Press. p. 259. ISBN 978-0-226-48202-6.
- Roderick D. Buchanan (2010). Playing With Fire: The Controversial Career of Hans J. Eysenck. Oxford University Press. p. 323. ISBN 978-0-19-856688-5.
- Stefan Kuhl (1994). The Nazi Connection:Eugenics, American Racism, and German National Socialism. Oxford University Press. p. 5. ISBN 978-0-19-988210-6.
- J.G. Shields (2007). The Extreme Right in France. Taylor & Francis. pp. 150, 145. ISBN 978-0-415-09755-0.
- Leonie Knebel and Pit Marquardt (2012). "Vom Versuch, die Ungleichwertigkeit von Menschen zu beweisen". In Michael Haller and Martin Niggeschmidt. Der Mythos vom Niedergang der Intelligenz: Von Galton zu Sarrazin: Die Denkmuster und Denkfehler der Eugenik. Springer DE. p. 104. doi:10.1007/978-3-531-94341-1_6. ISBN 978-3-531-18447-0. referring to P. Krebs, ed. (1981). Das unvergängliche Erbe. Alternativen zum Prinzip der Gleichheit. Tübingen: Grabert Verlag. ISBN 3-87847-051-7.
- Michael Billig, (1979) Psychology, Racism, and Fascism, on-line edition
- Eysenck, Hans J., Rebel With A Cause (an Autobiography), London: W. H. Allen & Co., 1990, pp. 215–228
- Hans Eysenck (1973). Race, Education and Intelligence. Maurice Temple Smith. pp. 9–10. ISBN 0-8511-7009-9.
- Gottfredson, Linda (13 December 1994). Mainstream Science on Intelligence. Wall Street Journal, p. A18.
- Gottfredson, Linda (1997). "Mainstream Science on Intelligence: An Editorial With 52 Signatories, History, and Bibliography". Intelligence 24 (1): 13–23. doi:10.1016/S0160-2896(97)90011-8.
- Eysenck, Hans (1998). Intelligence: A New Look. New Brunswick (NJ): Transaction Publishers. pp. 1–6. ISBN 1-56000-360-X.
- Eysenck, H. J. (1957), Sense and Nonsense in Psychology. London: Pelican Books. p. 131.
- Eysenck & Sargent (2nd edition, 1993), Explaining the Unexplained. London: BCA, No ISBN. Preface & ff.
- "National Portrait Gallery – Person – Hans Jürgen Eysenck". Npg.org.uk. 1 October 1950. Retrieved 22 July 2011.
- Gibson, HB (1981). Hans Eysenck: The man and his work. Peter Owen Limited. ISBN 0-7206-0566-0.
- Eysenck, Hans (1997). Rebel with a cause. Transaction Publishers. ISBN 1-56000-938-1.
- Goldberg, L. R. & Rosalack, T. K. (1994), "The big-five factor structure as an integrative framework: An empirical comparison with Eysenck’s P-E-N model". In: C. F. Halverson, G. A. Kohnstamm & R. P. Martin (eds). The developing structure of temperament and personality from infancy to adulthood (pp. 7–35), Hilldale, NJ: Erlbaum.
- Hans Eysenck: Hour-long lecture on the "Biological Basis of Personality" on YouTube (St Göran lecture, 1980).