Michael Polanyi

Last updated

Michael Polanyi
FRS
Michael Polanyi.png
Polanyi in England, 1933
Born
Pollacsek Mihály

(1891-03-11)11 March 1891
Died22 February 1976(1976-02-22) (aged 84)
Northampton, England
EducationGraduated in medicine, 1913; PhD in physical chemistry, 1919
Alma mater Eötvös Loránd University, Budapest
Technische Hochschule, Karlsruhe
University of Budapest
Occupation(s)Professor of physical chemistry, professor of social studies
Employer(s) Kaiser Wilhelm Institute
University of Manchester
Merton College, Oxford
Known for Polanyi's paradox
Polanyi's sphere
Potential theory of Polanyi
Bell–Evans–Polanyi principle
Eyring–Polanyi equation
Flow plasticity theory
Transition state theory
Harpoon reaction
Tacit knowledge
Post-critical
SpouseMagda Kemeny
Children2, including John
Relatives
Awards Gifford Lectures (1951–1952)
Fellow of the Royal Society (1944)

Michael Polanyi FRS [1] ( /pˈlænji/ poh-LAN-yee; Hungarian : Polányi Mihály; 11 March 1891 – 22 February 1976) was a Hungarian-British [2] polymath, who made important theoretical contributions to physical chemistry, economics, and philosophy. He argued that positivism is a false account of knowing.

Contents

His wide-ranging research in physical science included chemical kinetics, x-ray diffraction, and adsorption of gases. He pioneered the theory of fibre diffraction analysis in 1921, and the dislocation theory of plastic deformation of ductile metals and other materials in 1934. He emigrated to Germany, in 1926 becoming a chemistry professor at the Kaiser Wilhelm Institute in Berlin, and then in 1933 to England, becoming first a chemistry professor, and then a social sciences professor at the University of Manchester. Two of his pupils won the Nobel Prize, as well as one of his children. In 1944 Polanyi was elected to the Royal Society.

The contributions which Polanyi made to the social sciences include the concept of a polycentric spontaneous order and his rejection of a value neutral conception of liberty. They were developed in the context of his opposition to central planning. [3]

Life

Early life

Polanyi, born Mihály Pollacsek in Budapest, was the fifth child of Mihály and Cecília Pollacsek (born as Cecília Wohl), secular Jews from Ungvár (then in Hungary but now in Ukraine) and Wilno, then Russian Empire, respectively. His father's family were entrepreneurs, while his mother's father, Osher Leyzerovich Vol, was the senior teacher of Jewish history at the Vilna rabbinic seminary.[ citation needed ] The family moved to Budapest and Magyarized their surname to Polányi. His father built much of the Hungarian railway system, but lost most of his fortune in 1899 when bad weather caused a railway building project to go over budget. He died in 1905. Cecília Polányi established a salon that was well known among Budapest's intellectuals, and which continued until her death in 1939. His older brother was Karl Polanyi, the political economist and anthropologist, and his niece was Eva Zeisel, a world-renowned ceramist. [4]

Education

In 1908 Polanyi graduated the teacher-training secondary school, the Minta Gymnasium. He then studied medicine at the University of Budapest, obtaining his medical diploma in 1914. [5] He was an active member of the Galileo Circle. With the support of Ignác Pfeifer  [ de; hu ], professor of chemistry at the Royal Joseph University of Budapest, he obtained a scholarship to study chemistry at the Technische Hochschule in Karlsruhe, Germany. In the First World War, he served in the Austro-Hungarian army as a medical officer, and was sent to the Serbian front. While on sick-leave in 1916, he wrote a PhD thesis on adsorption. His research, which was encouraged by Albert Einstein, and supervised by Gusztáv Buchböck  [ de ], and in 1919 the Royal University of Pest awarded him a doctorate.

Career

In October 1918, Mihály Károlyi established the Hungarian Democratic Republic, and Polanyi became Secretary to the Minister of Health. When the Communists seized power in March 1919, he returned to medicine. When the Hungarian Soviet Republic was overthrown, Polanyi emigrated to Karlsruhe in Germany, and was invited by Fritz Haber to join the Kaiser Wilhelm Institut für Faserstoffchemie (fiber chemistry) in Berlin. A Christian since 1913, in a Roman Catholic ceremony he married Magda Elizabeth Kemeny. [6] In 1926 he became the professorial head of department of the Institut für Physikalische Chemie und Elektrochemie (now the Fritz Haber Institute). In 1929, Magda gave birth to their son John, who was awarded a Nobel Prize in chemistry in 1986. Their other son, George Polanyi, who predeceased him, became a well-known economist.

His experience of runaway inflation and high unemployment in Weimar Germany led Polanyi to become interested in economics. With the coming to power in 1933 of the Nazi party, he accepted a chair in physical chemistry at the University of Manchester. Two of his pupils, Eugene Wigner and Melvin Calvin, went on to win the Nobel Prize. Because of his increasing interest in the social sciences, Manchester University created a new chair in Social Science (1948–58) for him.

Polanyi was among the 2,300 names of prominent persons listed on the Nazis' Special Search List, of those who were to be arrested on the invasion of Great Britain and turned over to the Gestapo.

From June 1944 to 1947, Polanyi participated in the activities of The Moot, a Christian discussion circle concerned with shaping the post-war society, at the invitation of Karl Mannheim and J. H. Oldham. [7]

In 1944 Polanyi was elected a member of the Royal Society, [1] and on his retirement from the University of Manchester in 1958 he was elected a senior research fellow at Merton College, Oxford. [8] In 1962 he was elected a foreign honorary member of the American Academy of Arts and Sciences. [9]

Work

Physical chemistry

Polanyi's scientific interests were extremely diverse, including work in chemical kinetics, x-ray diffraction, and the adsorption of gases at solid surfaces. He is also well known for his potential adsorption theory, which was disputed for quite some time. In 1921, he laid the mathematical foundation of fibre diffraction analysis. In 1934, Polanyi, at about the same time as G. I. Taylor and Egon Orowan, realised that the plastic deformation of ductile materials could be explained in terms of the theory of dislocations developed by Vito Volterra in 1905. The insight was critical in developing the field of solid mechanics.

Freedom and community

In 1936, as a consequence of an invitation to give lectures for the Ministry of Heavy Industry in the USSR, Polanyi met Bukharin, who told him that in socialist societies all scientific research is directed to accord with the needs of the latest Five Year Plan. Polanyi noted what had happened to the study of genetics in the Soviet Union once the doctrines of Trofim Lysenko had gained the backing of the State. Demands in Britain, for example by the Marxist John Desmond Bernal, for centrally planned scientific research led Polanyi to defend the claim that science requires free debate. Together with John Baker, he founded the influential Society for Freedom in Science.

In a series of articles, re-published in The Contempt of Freedom (1940) and The Logic of Liberty (1951), Polanyi claimed that co-operation amongst scientists is analogous to the way agents co-ordinate themselves within a free market. Just as consumers in a free market determine the value of products, science is a spontaneous order that arises as a consequence of open debate amongst specialists. Science (contrary to the claims of Bukharin) flourishes when scientists have the liberty to pursue truth as an end in itself: [10]

[S]cientists, freely making their own choice of problems and pursuing them in the light of their own personal judgment, are in fact co-operating as members of a closely knit organization.

Such self-co-ordination of independent initiatives leads to a joint result which is unpremeditated by any of those who bring it about.

Any attempt to organize the group ... under a single authority would eliminate their independent initiatives, and thus reduce their joint effectiveness to that of the single person directing them from the centre. It would, in effect, paralyse their co-operation.

He derived the phrase spontaneous order from Gestalt psychology, and it was adopted by the classical liberal economist Friederich Hayek, although the concept can be traced back to at least Adam Smith. Polanyi unlike Hayek argued that there are higher and lower forms of spontaneous order, and he asserted that defending scientific inquiry on utilitarian or sceptical grounds undermined the practice of science. He extends this into a general claim about free societies. Polanyi defends a free society not on the negative grounds that we ought to respect "private liberties", but on the positive grounds that "public liberties" facilitate our pursuit of spiritual ends.

According to Polanyi, a free society that strives to be value-neutral undermines its own justification. But it is not enough for the members of a free society to believe that ideals such as truth, justice, and beauty, are not simply subjective, they also have to accept that they transcend our ability to wholly capture them. The non-subjectivity of values must be combined with acceptance that all knowing is fallible.

In Full Employment and Free Trade (1948) Polanyi analyses the way money circulates around an economy, and in a monetarist analysis that, according to Paul Craig Roberts, was thirty years ahead of its time, he argues that a free market economy should not be left to be wholly self-adjusting. A central bank should attempt to moderate economic booms/busts via a strict/loose monetary policy.

In 1940, he produced a film, "Unemployment and money. The principles involved", perhaps the first film about economics. [11] The film defended a version of Keynesianism, neutral Keynesianism, that advised the State to use budget deficit and tax reductions to increase the amount of money in the circulation in times of economic hardship but did not seek direct investment or engage in public works. [12]

All knowing is personal

In his book Science, Faith and Society (1946), Polanyi set out his opposition to a positivist account of science, noting that among other things it ignores the role personal commitments play in the practice of science. Polanyi gave the Gifford Lectures in 1951–52 at Aberdeen, and a revised version of his lectures were later published as Personal Knowledge (1958). In this book Polanyi claims that all knowledge claims (including those that derive from rules) rely on personal judgments. [13] He denies that a scientific method can yield truth mechanically. All knowing, no matter how formalised, relies upon commitments. Polanyi argued that the assumptions that underlie critical philosophy are not only false, they undermine the commitments that motivate our highest achievements. He advocates a fiduciary post-critical approach, in which we recognise that we believe more than we can know, and know more than we can say.

A knower does not stand apart from the universe, but participates personally within it. Our intellectual skills are driven by passionate commitments that motivate discovery and validation. According to Polanyi, a great scientist not only identifies patterns, but also significant questions likely to lead to a successful resolution. Innovators risk their reputation by committing to a hypothesis. Polanyi cites the example of Copernicus, who declared that the Earth revolves around the Sun. He claims that Copernicus arrived at the Earth's true relation to the Sun not as a consequence of following a method, but via "the greater intellectual satisfaction he derived from the celestial panorama as seen from the Sun instead of the Earth." [14] His writings on the practice of science influenced Thomas Kuhn and Paul Feyerabend.

Polanyi rejected the claim by British Empiricists that experience can be reduced into sense data, but he also rejects the notion that "indwelling" within (sometimes incompatible) interpretative frameworks traps us within them. Our tacit awareness connects us, albeit fallibly, with reality. It supplies us with the context within which our articulations have meaning. Contrary to the views of his colleague and friend Alan Turing, whose work at the Victoria University of Manchester prepared the way for the first modern computer, he denied that minds are reducible to collections of rules. His work influenced the critique by Hubert Dreyfus of "First Generation" artificial intelligence.

It was while writing Personal Knowledge that he identified the "structure of tacit knowing". He viewed it as his most important discovery. He claimed that we experience the world by integrating our subsidiary awareness into a focal awareness. In his later work, for example his Terry Lectures, later published as The Tacit Dimension (1966), he distinguishes between the phenomenological, instrumental, semantic, and ontological aspects of tacit knowing, as discussed (but not necessarily identified as such) in his previous writing.

Critique of reductionism

In "Life's irreducible structure" (1968), [15] Polanyi argues that the information contained in the DNA molecule is not reducible to the laws of physics and chemistry. Although a DNA molecule cannot exist without physical properties, these properties are constrained by higher-level ordering principles. In "Transcendence and Self-transcendence" (1970), [16] Polanyi criticises the mechanistic world view that modern science inherited from Galileo.

Polanyi advocates emergence i.e. the claim that there are several levels of reality and of causality. He relies on the assumption that boundary conditions supply degrees of freedom that, instead of being random, are determined by higher-level realities, whose properties are dependent on but distinct from the lower level from which they emerge. An example of a higher-level reality functioning as a downward causal force is consciousness – intentionality – generating meanings – intensionality.

Mind is a higher-level expression of the capacity of living organisms for discrimination. Our pursuit of self-set ideals such as truth and justice transform our understanding of the world. The reductionistic attempt to reduce higher-level realities into lower-level realities generates what Polanyi calls a moral inversion, in which the higher is rejected with moral passion. Polanyi identifies it as a pathology of the modern mind and traces its origins to a false conception of knowledge; although it is relatively harmless in the formal sciences, that pathology generates nihilism in the humanities. Polanyi considered Marxism an example of moral inversion. The State, on the grounds of an appeal to the logic of history, uses its coercive powers in ways that disregard any appeals to morality. [17]

Tacit knowledge

Tacit knowledge, as distinct from explicit knowledge, is an influential term developed by Polanyi in The Tacit Dimension [18] to describe among other things the ability to do something without necessarily being able to articulate it: for example, being able to ride a bicycle or play a musical instrument without being able to fully explain the details of how it happens. He claims that not only do practical skills rely upon tacit awareness, all perception and meaning is rendered possible by agents relying upon their tacit awareness. Every consciousness has a subsidiary and a focal awareness, and this distinction also has an ontological dimension, because a lower and a higher dimension is how emergence takes place.

Bibliography

See also

Notes

  1. 1 2 Wigner, E. P.; Hodgkin, R. A. (1977). "Michael Polanyi. 12 March 1891 – 22 February 1976". Biographical Memoirs of Fellows of the Royal Society . 23: 413. doi: 10.1098/rsbm.1977.0016 .
  2. Lévay, Júlia (20 September 2016). "A holográfia és a hologramok". mimicsoda.hu. Mi Micsoda.
  3. Biro, Gabor (2022). "From Red Spirit to Underperforming Pyramids and Coercive Institutions: Michael Polanyi Against Economic Planning," History of European Ideas, 2022". History of European Ideas. 48 (6): 811–847. doi:10.1080/01916599.2021.2009359. S2CID   225260656.
  4. "Eva Zeisel obituary". government-online.net. Government Online. 15 January 2012. Retrieved 6 April 2018.
  5. Scott, William T.; Moleski, Martin X. (2005). Michael Polanyi: scientist and philosopher. Oxford New York Auckland: Oxford University Press. pp. 16–21. ISBN   9780195174335 . Retrieved 6 June 2023.
  6. Torrance, Thomas F. (2002). "Mihály Polányi and the Christian faith: personal report" (pdf). Polanyiana (1–2), pp. 167–176.
  7. Mullins & Jacobs 2005, p. 28–29, 37.
  8. Levens, R.G.C., ed. (1964). Merton College Register 1900–1964. Oxford: Basil Blackwell. p. 499.
  9. "Book of Members, 1780–2010: Chapter P" (PDF). American Academy of Arts and Sciences. Retrieved 19 April 2011.
  10. Polanyi, Michael (1962). "The Republic of Science: Its Political and Economic Theory" (PDF). Minerva. 1: 54-74. doi:10.1007/BF01101453.
  11. Beira, Eduardo (2019). "pol1b – ebeira". sites.google.com. Retrieved 31 August 2020.
  12. Biro, Gabor (2020). ""Michael Polanyi's Neutral Keynesianism and the First Economics Film, 1933 to 1945," Journal of the History of Economic Thought, 2020". Journal of the History of Economic Thought. 42 (3): 335–356. doi:10.1017/S1053837219000476. S2CID   225260656.
  13. Personal Knowledge, p. 18
  14. Personal Knowledge p. 3
  15. Michael Polanyi (June 1968). "Life's Irreducible Structure". Science. 160 (3834): 1308–12. Bibcode:1968Sci...160.1308P. doi:10.1126/science.160.3834.1308. PMID   5651890.
  16. Michael Polanyi (1970). "Transcendence and Self-transcendence". Soundings. 53 (1): 88–94. JSTOR   41177772 . Retrieved 25 August 2020.
  17. Personal Knowledge, Ch. 7, section 11
  18. Polanyi, Michael (2009) [1966]. The tacit dimension. Chicago: University of Chicago Press. ISBN   978-0-226-67298-4. OCLC   262429494.
  19. Hayek, F. A. (May 1941). "Book Review: Michael Polanyi, The Contempt of Freedom: The Russian Experiment and After and Colin Clark, A Critique of Russian Statistics". Economica . 8 (30): 211–214. doi:10.2307/2550123. JSTOR   2550123.

Further reading

Professional and academic associations
Preceded by President of the Manchester Literary and Philosophical Society
1944–46
Succeeded by
Preceded by
Godfrey W. Armitage
President of the Manchester Statistical Society
1950–51
Succeeded by
Dr F. C. Toy

Related Research Articles

<span class="mw-page-title-main">Friedrich Hayek</span> Austrian-British economist and philosopher (1899–1992)

Friedrich August von Hayek, often referred to by his initials F. A. Hayek, was an Austrian-born British academic who contributed to political economy, political philosophy, and intellectual history. Hayek shared the 1974 Nobel Memorial Prize in Economic Sciences with Gunnar Myrdal for work on money and economic fluctuations, and the interdependence of economic, social and institutional phenomena. His account of how prices communicate information is widely regarded as an important contribution to economics that led to him receiving the prize. He was a major contributor to the Austrian school of economics.

<span class="mw-page-title-main">Karl Popper</span> Austrian–British philosopher of science (1902–1994)

Sir Karl Raimund Popper was an Austrian–British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of the classical inductivist views on the scientific method in favour of empirical falsification. According to Popper, a theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can be scrutinised with decisive experiments. Popper was opposed to the classical justificationist account of knowledge, which he replaced with critical rationalism, namely "the first non-justificational philosophy of criticism in the history of philosophy".

Scientism is the belief that science and the scientific method are the best or only way to render truth about the world and reality.

Tacit knowledge or implicit knowledge—as opposed to formalized, codified or explicit knowledge—is knowledge that is difficult to express or extract; therefore it is more difficult to transfer to others by means of writing it down or verbalizing it. This can include motor skills, personal wisdom, experience, insight, and intuition.

<span class="mw-page-title-main">John Polanyi</span> Canadian chemist (born 1929)

John Charles Polanyi is a German-born Canadian chemist. He was awarded the 1986 Nobel Prize in Chemistry for his research in chemical kinetics.

<span class="mw-page-title-main">Karl Polanyi</span> Economist, philosopher and historian (1886–1964)

Karl Paul Polanyi was an Austro-Hungarian economic anthropologist, economic sociologist, and politician, best known for his book The Great Transformation, which questions the conceptual validity of self-regulating markets.

<i>The Road to Serfdom</i> Book by Friedrich von Hayek

The Road to Serfdom is a book by the Austrian-British economist and philosopher Friedrich Hayek. In the book, Hayek "[warns] of the danger of tyranny that inevitably results from government control of economic decision-making through central planning." He further argues that the abandonment of individualism and classical liberalism inevitably leads to a loss of freedom, the creation of an oppressive society, the tyranny of a dictator, and the serfdom of the individual. Hayek challenged the view, popular among British Marxists, that fascism was a capitalist reaction against socialism. He argued that fascism, Nazism, and state-socialism had common roots in central economic planning and empowering the state over the individual.

Spontaneous order, also named self-organization in the hard sciences, is the spontaneous emergence of order out of seeming chaos. The term "self-organization" is more often used for physical changes and biological processes, while "spontaneous order" is typically used to describe the emergence of various kinds of social orders in human social networks from the behavior of a combination of self-interested individuals who are not intentionally trying to create order through planning. Proposed examples of systems which evolved through spontaneous order or self-organization include the evolution of life on Earth, language, crystal structure, the Internet, Wikipedia, and free market economy.

Polányi, Polanyi is a surname. There have been a number of prominent individuals in the Polanyi family, illustrated in the following family tree:

This is the chronological list of books by the Austrian school economist and philosopher Friedrich Hayek. The dates in brackets are the original year of publication of the book.

<span class="mw-page-title-main">The Use of Knowledge in Society</span> 1945 scholarly article by economist Friedrich Hayek

"The Use of Knowledge in Society" is a scholarly article written by Austrian-British academic economist Friedrich Hayek, first published in the September 1945 issue of The American Economic Review.

<span class="mw-page-title-main">Mary Jo Nye</span> American historian of science

Mary Jo Nye is an American historian of science and Horning Professor in the Humanities emerita of the History Department at Oregon State University. She is known for her work on the relationships between scientific discovery and social and political phenomena.

<span class="mw-page-title-main">August von Hayek</span> Austrian physician and botanist (1871–1928)

August von Hayek was an Austrian physician and botanist born in Vienna. He was the son of naturalist Gustav von Hayek and the father of economist Friedrich Hayek (1899–1992).

<span class="mw-page-title-main">Thomas Kuhn</span> American philosopher of science (1922–1996)

Thomas Samuel Kuhn was an American historian and philosopher of science whose 1962 book The Structure of Scientific Revolutions was influential in both academic and popular circles, introducing the term paradigm shift, which has since become an English-language idiom.

Post-critical is a term coined by scientist-philosopher Michael Polanyi (1891–1976) in the 1950s to designate a position beyond the critical philosophical orientation. In this context, "the critical mode" designates a way of relating to reality that was initiated in the years preceding the Enlightenment period and since then has become the predominant intellectual mode of Modernity. Polanyi's ideas in this regard were extended in the 1960s and thereafter by William H. Poteat (1919–2000), drawing upon and combining in new ways certain ideas of seminal critics of culture since the Enlightenment such as Pascal, Kierkegaard, Arendt, Wittgenstein, and Merleau-Ponty. Those ideas were further extended by several of Poteat's students and by other members of the Polanyi Society.

<span class="mw-page-title-main">William H. Poteat</span> American philosopher

William H. Poteat was an American philosopher, scholar, and charismatic professor of philosophy, religion, and culture at the University of North Carolina at Chapel Hill from 1947 to 1957 and at Duke University from 1960 to 1987. During that time he did foundational work in the critique of Modern and Postmodern intellectual culture. He was instrumental in introducing scientist-philosopher Michael Polanyi and his Post-Critical philosophy to the United States. He was a master of the Socratic Method of teaching and identified himself a "practicing dialectician," skilled through the use of irony in "understanding and elucidating conflicting points of view" As a Post-Critical philosopher, he encouraged his students and the readers of his books to recover their authentic selves from the confusing, self-alienating abstractions of modern intellectual life. This task and purpose Poteat came to recognize as profoundly convergent with Michael Polanyi's critique of Modern Critical thought. His teaching and writing also drew upon and combined in new ways the ideas of seminal critics of modern culture such as Pascal, Kierkegaard, Arendt, Wittgenstein, and Merleau-Ponty—whose thinking Poteat came to identify as "Post-Critical", using a key concept from Michael Polanyi's Personal Knowledge: Towards a Post-Critical Philosophy. His papers are archived at the Yale Divinity School Library.

The potential theory of Polanyi, also called Polanyi adsorption potential theory, is a model of adsorption proposed by Michael Polanyi where adsorption can be measured through the equilibrium between the chemical potential of a gas near the surface and the chemical potential of the gas from a large distance away. In this model, he assumed that the attraction largely due to Van Der Waals forces of the gas to the surface is determined by the position of the gas particle from the surface, and that the gas behaves as an ideal gas until condensation where the gas exceeds its equilibrium vapor pressure. While the adsorption theory of Henry is more applicable in low pressure and BET adsorption isotherm equation is more useful at from 0.05 to 0.35 P/Po, the Polanyi potential theory has much more application at higher P/Po (~0.1–0.8).

Vittorio Filippo Guidano was an Italian neuropsychiatrist, creator of the cognitive procedural systemic model and contributor to constructivist post-rationalist cognitive therapy. His cognitive post-rationalist model was influenced by attachment theory, evolutionary epistemology, complex systems theory, and the prevalence of abstract mental processes proposed by Friedrich Hayek. Guidano conceived the personal system as a self-organized entity, in constant development.

<span class="mw-page-title-main">Polanyi's paradox</span> Philosophical theory

Polanyi's paradox, named in honour of the British-Hungarian philosopher Michael Polanyi, is the theory that human knowledge of how the world functions and of our own capability are, to a large extent, beyond our explicit understanding. The theory was articulated by Michael Polanyi in his book The Tacit Dimension in 1966, and economist David Autor gave it a name in his 2014 research paper "Polanyi's Paradox and the Shape of Employment Growth".

Personal science is a term used by the late psychologist and scientist Seth Roberts, who defined it as: "using science to solve your own problems". Associated fields are self-experimentation and citizen science. The concept has been further developed within the Quantified Self community. The first use of the term in a scientific publication was in 2016, where it was associated with: "an interest in collecting data about their own bodies or lives in order to obtain insights into their everyday health or performance". In 2017, the scientific journal Methods of Information in Medicine published a focus theme on single subject (N-of-1) research design, which also included personal science. The editorial introducing the focus theme is titled "Single Subject (N-of-1) Research Design, Data Processing, and Personal Science" is co-authored by Gary Wolf, who together with Kevin Kelly coined the phrase the quantified self. In the editorial, personal science was described as "self-directed N-of-1 studies". In 2020, Wolf further developed the term together with Martijn de Groot in an article titled "A Conceptual Framework for Personal Science". They defined personal science as "the practice of using empirical methods to explore personal questions". In a 2021 scientific article building on the previous ones, personal science is defined as: "the practice of exploring personally consequential questions by conducting self-directed N-of-1 studies using a structured empirical approach".