Category Archives: History and philosophy of science

Frontiers of Physics 2012 at Trinity College Dublin

I spent last weekend at the Frontiers of Physics conference at Trinity College Dublin. This is an annual meeting hosted by the Institute of Physics in Ireland; the aim is to establish links with secondary schools all over the country and to present the latest developments in physics and physics teaching. This year it was Trinity’s turn to host the conference and it was excellent, not least due to the superb organisation of IoP teaching coordinators Paul Nugent and David Keenahan.

Saturday morning featured some great lectures in the historic Schrödinger lecture theatre, located in the Fitzgerald building of Trinity’s School of Physics. Visiting this building always feels like coming home for me, as I did my PhD in one of the labs downstairs and gave tutorials in the Schrödinger theatre as a postgrad. The library on the second floor of the Fitzgerald building is becoming a notable science museum, with exhibits for many great scientists associated with Trinity such as Preston, Joly, Fitzgerald and Walton. (Schrödinger himself was a Professor at the Dublin Institute for Advanced Studies, not Trinity, but the theatre is named after the famous ‘What is Life? ‘ series of public lectures he gave there there).

The Schrödinger lecture theatre on the top floor of the Fitzgerald building

The Fitzgerald building, home to the physics department at TCD. The bubbles are a mockup of a sculpture that will honour the department’s Nobel laureate Ernest Walton

I won’t describe the lectures in detail, but three stood out for me:  ‘Tuning in the radio sun’, a description of solar astronomy at Birr Castle by Prof Peter Gallagher, head of the solar physics group at Trinity: ‘Tiny but mighty’ , a superb introductory lecture on nanotechnology by Prof Jonathan Coleman, head of the low-dimensional nanostructures group at Trinity: and ‘CERN, the LHC and the Higgs boson’  by Steve Myers, director of accelerators and technology at CERN.

Yes, that Steve Myers, the Belfast-born director of accelerators at CERN. Steve gives great talks on the nuts-and-bolts of the Large Hadron Collider and this was the main reason I was at the meeting. I’m scheduled to give yet another talk on the Higgs boson next month, so it’s important to catch lectures like this whenever I can. There’s nothing like hearing details of the experiment from the horse’s mouth and Steve certainly didn’t disappoint.

Steve Myers in action at the conference

On the teaching of physics, Dr Karen Bultitude of University College London gave an interesting lecture on ‘Gender Aware Teaching Practice’. As everyone in the discipline knows, a marked gender imbalance persists amongst students choosing physics; Karen’s main point was that all of the research done in this area indicates that making physics more ‘girly’ simply does not work, and she had some important tips for making physics more approachable for both genders. (Once more, it raises the question how a certain video at the European Comission ever saw the light of day, but let’s not go there).

After the lectures, we were treated to lunch in Trinity Dining Hall;  I think those who had not visited the college before were blown away by the Hall and by the walk across Front Square. Maybe I notice this sort of thing more after another trip to the US (see previous post), but the best was yet to come..

The Dining Hall at Trinity

Front Square at Trinity College

After lunch, we were treated to an exhibition of Walton memorabilia by  Dr Eric Finch. (Ernest Walton, a former Head of Physics at Trinity, won a Nobel prize for splitting the atomic nucleus with Cockroft in 1932). Eric had many fascinating things to show us, not least the famous letter where the brilliant young scientist describes his ‘red-letter day’ to his fiancee. Best of all, the exhibition is currently situated in Trinity’s Long Room, one of the most famous libraries in the world and a sight well worth seeing in it’s own right.

Dr Eric Finch at the Walton exhibit in the Long Room

The Long Room at TCD – it really is like this

Finally, we all trooped back to the physics department to see the Monck observatory. Since my time at the college, an observatory has been installed on the roof of the Fitzgerald building, consisting of an Atmospheric and Space Weather Monitor (outside radio antenna) and a Schmitt reflecting telescope (inside the dome, see below). Brian Espey, Professor of astrophysics at TCD,  described the operation of the telescope and we each had a peep. The observatory must be one of the most centrally located telescopes anywhere in the world- however, apparently the light pollution is not as bad as you might expect because the college is a quiet island in the centre of the city at night. I’m told the main problem is the use of floodlights for rugby practice!

The new dome on top of the Fitzgerald building

The Schmitt reflector inside the dome

The radio antenna for atmospheric measurements

All in all, a great meeting in a superb setting. The Frontiers conference takes place in a different venue each year, but it’s hard to compete with 400 years of history…

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Hamilton Walk and Maths Week in Ireland

October 16th is a special day for mathematics and physics in Ireland. On this day, we commemorate the discovery of quaternions by William Rowan Hamilton, the great Irish mathematician and astronomer. Essentially, his insight was to postulate three distinct roots for the number -1, thus generalising complex numbers to four dimensions. It can be said that this discovery marks the birth of modern algebra, as quarternions opened the door to non-commutable algebra. Quaternions have found great application in modern technology, notably in compter algorithims for animation in films and computer games.

William Rowan Hamilton made a great many other contributions to mathematics and physics. For example, his formulation of a mathematical operator for the energy of a body – the Hamiltonian –  is a vital tool in quantum mechanics, the mathematical description of the quantum world. Open any modern textbook on quantum physics and you will encounter the word ‘Hamiltionian’ on almost every page.

As regards quaternions, we know exactly when Hamilton had his Eureka moment. According to his own writing, inspiration struck on the 16th october in 1843,  as he was walking with his wife from Dunsink Observatory in County Dublin (where he was Astronomer Royal) along the Royal Canal towards the city centre, in order to attend a meeting of the Royal Irish Academy, of which he was President.  He was so pleased with the breakthrough that he used his penknife to carve the new equation onto Broom bridge as they passed. The carving no longer exists but the bridge does, and the occasion is celebrated with a plaque. Every year, mathematicians and friends of mathematics congregate at Dunsink Observatory at 3pm and re-enact Hamilton’s famous walk along the canal to the bridge.

  

William Rowan Hamilton; the plaque displays the famous equation i2 = j2 = k2 = ijk = -1

This year, October 16th fell on a Sunday, so mathematicians and the general public arrived from far and near. The day started in Dunsink Observatory, with a brief description of Hamilton’s life and work by Fiacre O Cairbre, event organiser and lecturer in mathematics at NUI Maynooth. There followed a lovely walk along the canal in perfect weather conditions, all the way to Broom bridge to view the plaque. The outing finished with a short description of Hamilton’s breakthrough by another Maynooth mathematician, Anthony O’ Farrell, and a chorus of ‘Happy birthday, quaternions’ by all present. I think it’s great to remember our scientific heros like this;  it’s curious that even our very best scientists and mathematicians receive far less public attention that writers and musicians.

 

Dunsink Observatory and Broom Bridge on the Royal Canal

Each year, the Hamilton Walk is soon followed by a prestigious lecture on mathematics presented by the Royal Irish Academy and The Irish Times. Previous speakers have included Andrew Wiles, Steven Weinberg, Murray Gellman and Lisa Randall. This year, renowned string theorist Ed Witten will give a talk on quantum knots, see here.

The Hamilton walk  is one of the core activies of Maths Week Ireland, an initiative to raise awareness of maths in Ireland with events and lectures all around the country. Co-ordinated by CALMAST, a science outreach group at Waterford Institute of Technology, Maths Week has grown larger every year – you can find the program of events here. I will give a talk in Dublin on Wednesday evening, on relativity and the recent ‘faster than the speed of light’ experiment, see here .

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Tyndall conference in Ireland

This weekend, I caught the last day of a climate conference honouring the memory of the great Irish scientist John Tyndall. Born in County Carlow, Tyndall became a key member of the Royal Society around the time of Charles Darwin. He studied under Robert Bunsen in Germany and did much to promote the idea of experimentation in science. Among his many contributions are the discovery of the Tyndall effect (an explanation for the colour of the sky in terms of the scattering of light) and pioneering works in optics.

Tyndall’s most important contribution was his experimental demonstration of the greenhouse effect. He was the first to show that certain gases – notably carbon dioxide and water vapour – absorb radiation of infra-red wavelength, thus trapping heat reflected from the earth. This discovery forms the bedrock of the modern climate science. Today’s phenomenon of global warming (measured as an increase in global temperature, glacier-melt and sea level rise over the last few decades) has been attributed to an increased concentration of greenhouse gases in the atmosphere caused by the burning of fossil fuels.


The 2011 Tyndall climate conference was sponsored by the EPA and the Royal Irish Academy

The conference celebrated the 150th anniversary of the publication of Tyndall’s landmark paper On the Absorption and Radiation of Heat by Gases and Vapours and took place in Dublin castle, a superb venue in the heart of Dublin’s vibrant city center (and the seat of British rule in Ireland only a century ago). Day one was an overview of Tyndall’s life and work, with a keynote lecture by eminent climatologist Richard Sommerville. The next two days featured slightly more technical talks on climate science. You can find the conference program and book of abstracts here.

I caught several excellent talks on Friday, including a talk on climate sensitivity and feedback mechanisms by John Mitchell of the UK Hadley Centre, and a talk on tipping points and their predictability by Peter Ditlevensen of the Center for Ice and Climate at the Niels Bohr Institute in Copenhagen. Another talk, by George Moore of the University of Toronto, suggested that we may already have passed such a tipping point. The lecture  ’20 years of IPCC projections’ by Ulrich Cubasch of the Free University of Berlin, demonstrated how well IPCC projections have stood the test of time. This is a point often overlooked in discussions of climate science in the media. The public are wary of theoretical models, and climate scientists sometimes forget to point out that we have had twenty years to test predictions – so far, the projections have turned out to be all too accurate.

Possibly the most advanced talk of the day was by Professor Ray Bates of the Meteorology and Climate Centre at University College Dublin, a former professor of meteorology at the Neils Bohr Institute. In his talk, Ray presented a new global climate model, contrasting it with the recent model of Dick Lindzen. The Lindzen model is quite controversial as it suggests that conventional climate models overestimate the contribution of an enhanced greenhouse effect on climate. In good scientific fashion, Ray outlined the basic physics underpinning the two models, steering clear of polemics and concentrating on the science. You can Ray’s paper on his, and other, models here .

All in all, a great conference, I was sorry to miss the first two days. One of the aspects the increased teaching workload in the Institute of Technology sector is that there is almost no time left over for conferences – someone’s idea of increased productivity.

Update

Richard Sommerville did a very nice interview on the Pat Kenny show, a flagship radio show on RTE radio 1. Pat raised almost every point favoured by climate skeptics, while Richard provided clear and cogent answers to each. Well worth a listen, you can download a podcast here.

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The co-production of knowledge

In his last lecture on the history and sociology of science for sophomores at Harvard, Alex Wellerstein brought the class up to date with the latest thinking in Science and Technology Studies (STS) with an overview of the idea of co-production.

The idiom of co-production aims to get away from both the deterministic view of science as divorced from social context, and from social determinism. Instead, scientific knowledge is seen to be produced in an integral process that involves both the scientific method and the social context. Hence, the idea of co-production engages with questions that are both metaphysical and epistemological – how the world is, and how we find out about it – but blurs the boundaries between the two. This is slightly different to previous theories such as the sociology of scientific knowlege (SSK) of the Edinburgh group; a key difference is that co-production does not claim that social context ‘trumps’ the scientific method, but sees both as integral to scientific knowledge.

The figure most associated with the idiom of the co-production of knowledge is Sheila Jasanoff, the brilliant Professor of Science, Technology and Society at Harvard (my current boss!). Sheila has long been a leading light in the field of STS, and her articulation of the idea of co-production is considered one of her main contributions to the field.

In her seminal book, “States of knowledge: the co-production of science and social order”, a collection of essays by diverse authors on the subject, Sheila gives an overview of the idiom of co-production in the first chapter and a summary in the last. She describes the objectives of co-production in terms of four components

description: a view of science in society and society in science
explanation: how co-production mitigates against linear and mono-causual stores about scientific progress
normativity : the analysis of emerging orders
prediction : prediction, prescription and action

There is a great deal to the concept of co-production, including concepts such as causality loops, positive feedback and co-evolution. I won’t attempt to summarize them here but you can find a very good review of the main themes in the last chapter of the book above.

Reception

The articulation of co-production in its current form is relatively recent, and I am not aware of major reactions against it from philosophers or scientifists. One obvious benefit is clarity; a common criticism (and misunderstanding) of the social constructivists is the idea that scientific knowledge is entirely socially constructed. This is not really what most constructivists argue, and I think the idiom of co-production clarifies this a lot.
Also, it is rather hard to argue against co-production- how can one argue that scientific knowledge (or any other sort) is not co-produced to some extent? I think this is the cleverest part of the concept, and I suspect it will help convince scientists of the importance of social context, and go some way towards mending fences between the scientists and the sociologists of science.

That said, it seems to me that while co-production helps to  clarify how knowledge is created, it doesn’t say much about another part of the scientific process, i.e. how good scientific theories survive the passage of time (this the context of discovery vs the context of justification we’ve met before). You might argue that the subsequent testing is also co-produced, and so it is; but where a given scientific theory is produced in one place and one context, it is subsequently tested over time all over the world in different contexts by people specialize in proving each other wrong! Hence, many scientists argue that social context arguments ultimately fade away.

A good example of this is the famous argument by historian Paul Forman concerning the indeterminacy of quantum physics. Scientists in Germany were heavily criticized after WWI for predicting that science would win the war; according to Forman, the indeterminacy of quantum physics may be attributed – at least to some degree – to an attempt to appease the population (we are happy to admit the limits of science etc). However, most physicists strongly disagree with Forman’s hypothesis for three reasons

  • the postulate of wave properties for the electron was first made by de Broglie (a Frenchman), and the first observation of electron diffraction was by Davisson and Germer (Americans). The latter forces you to quantum duality and thus to indeterminacy – whether you like it or not
  • many other non-German scientists (Niels Bohr, Paul Dirac etc) played a major role in the development of the theory
  • the theory survived over time worldwide because, although crazy, it matched experiment

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Boris Hessen and externalism

We met a very interesting figure in the study of the history of science in class today: the Russian physicist Boris Hessen. Hessen is famous for a 1931 paper entitled The Social and Economic Roots of Newton’s Principia, in which he suggested that Newton’s monumental work was created to cater to the goals and desires of 17th century industry and society in England. In other words, Hessen argued that Newton’s work was not the disinterested study of the natural world, but was motivated by an attempt to solve the problems of society of the day.

Boris Hessen (1893-1936)

Modern scholarship has revealed that Hessen’s motives were not completely academic. In the Soviet Union in the 1930s, the work of Albert Einstein was under attack by Communist Party philosophers, as they saw it as a concern of the bourgeoisie. Hessen was a strong supporter of Einstein’s theories and his study of Newton was intended to show that scientific validity could exist whatever the motivations were for undertaking it. Sadly, he was executed by the NKVD in 1936.

Hessen’s focus on the relationship between society and science was quite novel at the time and became very influential. It was a challenge to the tacit notion that the story of science is a story of independent genius in action. The assertion of a connection between the growth of knowledge and society at large was viewed with keen interest, not least because of the prospect of another war in Europe. Previous views of science as separate from the mundane aspects of life were becoming less plausible than a view of scientists embedded in the world in which they worked.

This view of the history of science  i.e. looking at the manner in which science and scientists are affected by society, is now known as externalism. It is the opposite view to internalism , a view that sees the acquisition of scientific knowledge as a process that can occur at any place and time given the right human actors. Internalist histories of science tend to focus on the development of ideas wholly within the scientific world, and emphasize the norms of modern science such as disinterestedness and universalism.

Which is the “correct” view for a historian of science? This is not an easy question to answer because the differences between internalism and externalism are closely related to basic problems in the philosophy of science we have met before. What is the relationship between the producers and consumers of scientific knowledge? What does objectivity really mean in a scientific context? All of which quickly leads us back to familiar questions such as what is the nature of scientific truth?

The historian and sociologist of science Robert K. Merton produced many famous works in reaction to Hessen’s thesis. Merton accepted the influence of external factors on science but differed from Hessen in his interpretation: Merton maintained that while researchers may be inspired by problems suggested by extra-scientific factors, ultimately the researcher’s interests are driven by the internal history of the science in question. Indeed, Merton sought to delineate externalism and internalism along disciplinary boundaries, with context studied by the sociologist of science and content by the historian.

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The philosophy of Bruno Latour part II

In the last post, we touched on some of Latour’s ideas that have been so influential in the history and philosophy of science, notably the work Laboratory Life and the later concept of Actor Network Theory.


An early contribution that should be mentioned is Latour’s study of the work of Louis Pasteur: in The Pasteurization of France , Latour published a history of Pasteur’s work that laid great emphasis on the social forces at work at the time, and on Pasteur’s harnessing of those forces. In the book, Latour goes to some lengths to argue that the widespread acceptance of Pasteur’s work by French society was not primarily a matter of evidence or reason, but due to a large degree to social factors that had been neglected in earlier accounts. This work went on to become very influential in the field of Science and Technology Studies (STS).

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What is really unusual about Bruno Latour is that this particular philosopher published a review paper in 2004 that seemed to question the fundamental premises of most of his career. Titled “Why Has Critique Run out of Steam? From Matters of Fact to Matters of Concern” , the paper contains a critique of much of his own work and of the social criticism of science in general. Latour specifically asks  “Was I wrong to participate in the invention of this field known as science studies?” and suggests that much of social criticism may have been directed at the wrong target.

What caused this apparent change of heart? One reason is that, like many STS scholars, Latour seems concerned that many of his cherished critical ideas have been appropriated by constituencies whose agenda is anti-science; specifically by “conspiracy theorists, including global warming skeptics and the 9/11 Truth movement“. He expresses concern that his attempts to lay bare “the lack of scientific certainty inherent in the construction of scientific facts” have now been appropriated in a manner he never intended; “I am worried to detect, in those mad mixtures of knee-jerk disbelief, punctilious demands for proofs, and free use of powerful explanation from the social neverland, many of the weapons of social critique.”

A second cause for a rethink is that Latour feels there are some fundamental flaws in social critique; in particular that “there are inconsistencies and double standards that go largely unrecognized in the field”. His point here is that “social critics tend to use anti-fetishism against ideas they personally reject; to use “an unrepentant positivist” approach for fields of study they consider valuable; all the while thinking as a perfectly healthy sturdy realist for what you really cherish.”

These are serious criticisms and Latour goes on to suggest that in order to maintain any vitality or relevance,  social critique of science requires a drastic reappraisal; in particular “it must embrace empiricism, to insist on the cultivation of a stubbornly realist attitude – to speak like William James”. Embrace empiricism? Speak like William James? Much of the above seems a fairly radical U-turn for an outstanding proponent of the constuctivist view of science. However, it should be pointed out that there are different interpretations of Latour’s 2004 article as we shall see below.

Reception

Latour’s 2004 paper has received a great deal of attention. Many scientists, and some historians of science, see it as a recant. Sentences such as “the danger would no longer be coming from an excessive confidence in ideological arguments posing as matters of fact …but from an excessive distrust of good matters of fact disguised as ideological biases” resonated with many scientists, as did “ dangerous extremists are using the very same argument of social construction to destroy hard-won evidence that could save lives”. This was a common criticism of the social study of science all along – that there was a danger of throwing the baby out with the bathwater i.e. that social critique of science was serving to undermine hard-won scientific discoveries, all on the basis of sociological methodologies that were themselves far from perfect.

On the other hand, scholars in the field of Science and Technology Studies point out that a careful reading of Latour 2004 shows that he is talking about the future, not the past; his paper is primarily concerned with future directions for fruitful research in the social study of science, not with past studies. This is more marked in the second part of the article; Latour’s real point is that the world has changed, but the target of social critique may not changed to match this. He is particularly concerned at the instant revisionism he reads, from 9/11 conspiracies to moon landing fables. In a nutshell his main concern is ” what if explanations resorting to power, society discourse had outlived their usefulness and deteriorated to the point of now feeding the most gullible sort of critique?…threats might have changed so much that we might still be directing all our arsenal east or west while the enemy has moved to a very different place”.

What interpretation is correct? It’s hard to say, as always with Latour. In any case, it is an extremely thought-provoking article from a major figure in the social studies of science ..I strongly recommend reading it for yourself

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The philosophy of Bruno Latour (part I)

In today’s class on the history and philosophy of science, Alex introduced us to the French philosopher Bruno Latour. Latour is an extremely influential figure in the philosophy and sociology of science, and a leading light of the modern field of Science and Technology Studies.

Bruno Latour

Much of today’s discussion concerned an early work of Latour, the book Laboratory Life: the Construction of Scientific Facts co-authored with Steve Woolgar. In the book, the authors undertake a study of a scientific research laboratory using the methods of anthropology. They make two major observations; first that laboratory process is deeply a process of inscription i.e. all measurements are ultimately reduced to written documents that are then durable and transportable. Hence, measurements are not debated directly but via representations such as documents and graphs. Second, Latour and Woolgar find that their observation of laboratory process does not square with the common understanding of the scientific method, in which theories stand or fall on the outcome of careful experiments. Instead, they find that an experiment typically produces only inconclusive data and that a large part of laboratory method involves taking the subjective decision of what data to keep and what to throw out. Hence, the experimental process is an elaborate mechanism for constructing facts rather than uncovering them.

This idea, that ‘scientific facts’ are not uncovered in a laboratory so much as produced or constructed, led Latour to more abstract ideas of the construction of knowledge. In particular, he formulated his ideas in terms of a theory known as Actor Network Theory (ANT). ANT describes scientific facts as being constructed via a methodology that involves a network of different actors; the scientists, the equipment, the laboratory, the technicians, the subjects or samples being studied and the wider scientific community etc. In Latour’s view, any study of science methodology must involve a detailed study of all the actors involved (particularly the non-personal ones) and on their interactions and alliances; scientific knowledge is then the product of the such alliances. [A classic example of ANT is an analysis of a scientific study of scallops by Michel Callon].

What exactly does Latour actually mean by the construction of scientific facts? Clearly, some things are socially constructed; society agrees on the importance of money so it becomes important, even though dollar bills are inherently worthless (this is known as known as weak construction). It also seems reasonable to argue that knowledge is socially constructed at least to some extent; that how we ‘find things out’ is very much contingent on the actorsinvolved i.e. scientists, samples, equipment, institutions and their interaction with one another. However, Latour goes further than this; he insists that what we call scientific facts are socially constructed. In a sense, researchers transform disorderly nature into orderly artifacts; scientists produce new objects in the lab, not pre-existing ones. For example, in Latour’s view, E = mc2 is not a fact of nature; it is a constructed fact, just like a beautiful building or a Mozart symphony. Note that this constructivist view of scientific knowledge may seem at odds with scientific realism (the belief that there is a real world out there and that science reveals the deep structure of nature). However, this is not a given as Latour is talking about the acquisition of knowledge; that said, he does seem to lean towards anti-realism as we shall see later..

Reception

Laboratory Life and similar studies that followed it have been enormously influential among philosophers and sociologists of science. However, a common criticism from scientists is that it is possible that the methods of anthropology give only a superficial view of scientific work. In this view, it only seems to Latour that some data was arbitrarily rejected; in fact, it was rejected for good reasons that would only be comprehensible to someone experienced in both theory and experiment (just as an experienced car mechanic will ignore side issues and quickly home on what is wrong with an engine using a process that is clear only to other mechanics). This may seem a rather arrogant view, but it is true that it takes years to train a student to be a good experimentalist.  [It’s interesting to imagine what an anthropologist with no musical training would make of a symphony orchestra; this person would make many interesting observations about the dress and social behaviour of the musicians, but could she form a good understanding of the core activity of the musicians, the group interpretation and performance of difficult music?].

On the construction of knowledge, Latour’s view has become a major lynchpin of the field of science and technology studies. It is a radical and difficult concept.  Most philosophers of science agree that knowledge is socially constructed in its acquisition and pay attention to studies by Latour and others of laboratory practice as a social phenomenon. However, whether this affects the ultimate content of scientific knowledge over time is the subject of much debate (philosophers call this the difference between the ‘context of discovery’ and the ‘context of justification‘). Hence, the process by which the phenomenon of radioactivity was discovered was undoubtedly a complex social process, involving the interaction of many scientists, seemingly unrelated studies, samples, equipment and institutions, to name but a few actors. But to suggest that our current knowledge of radioactivity is entirely dictated by this process seems more problematic; and to suggest further (as Latour often seems to) that the phenomenon of radioactivity is a human construct seems very strange. For example, people died of exposure to radioactivity before anyone knew of the dangers of gamma radiation; how is this reconcilable with a view of radioactivity as a constructed fact? Indeed, Latour attracted some negative publicity over just such a claim; when French scientists declared in 1976 that tests on the mummy of Pharoah Ramses II pointed to a death by tuberculosis, Latour claimed this to be impossible because the bacillus virus was not known at the time of the ancient Egyptians!

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The philosophy of Paul Feyerabend

We have seen that Lakatos adopted a view of science that is somewhere in between that of Popper and Kuhn. The Austrian philosopher Paul Feyerabend also studied under Popper, but adopted a very different position to that of Lakatos. Starting with Kuhn’s view that paradigm shifts do not occur on the basis of reason alone, Feyerabend went on to develop what is known as an anarchistic philosophy of science.

Paul Feyerabend

Feyerabend was heavily influenced by the counter-culture movements of the 1960s. The central themes of his philosophy of science can be found in his seminal work Against Method. (The book was originally intended to be published as a dialogue with his friend and colleague Lakatos but the latter died before the project was finished). I will try to summarize Feyerabend’s view of science in a few points;

1. On the issue of falsifiability, Feyerabend argues (in common with Kuhn and Lakatos) that no theory is ever consistent with all the relevant facts. Like Lakatos, he sees the use of ad-hoc postulates to save the dominant paradigm as an essential to the progress of science (see last post). However, Feyerabend goes much further than Lakatos; taking examples from the history of science, he claims that scientists frequently depart completely from the scientific method when they use ad-hoc ideas to explain observations that are only later justified by theory. To Feyerabend, ad-hoc hypotheses play a central role; they temporarily make a new theory compatible with facts until the theory to be defended can be supported by other theories.

2. On the issue of paradigm shifts (or moving from a regressive research programme to a progressive one, as Lakatos would say), Feyerabend emphasises Kuhn’s idea that the reigning paradigm heavily influences interpretation of observed phenomena.  However, he adds to this by suggesting that in the paradigm model, the reigning paradigm would also have a stifling influence on the incoming theory; instead of being dictated by agreement with observation alone, the new theory must also agree with the old in almost every instance.

3. Epistemological anarchism; putting the two points above together, Feyerabend concludes that it is impossible to view the progress of science in terms of one set of methodological rules that is always used by scientists; such a ”scientific method’ would in fact limit the activities of scientists and restrict scientific progress. Instead of operating according to universal and fixed rules, Feyerabend suggests that science often progresses by ad-hoc postulates that break the rules; this ‘anything goes’ view is formally known as epistemological anarchism.

4. Science and Society: the doctrine of epistemological anarchism is considered Feyerabend’s major contribution, However, he also had a major point to make about science and society. Starting from the view that a universal scientific method does not exist, Feyerabend goes on to argue that science therefore does not deserve its privileged status in western society. Since scientific points of view do not arise from using a universal method which guarantees high-quality conclusions, there is no justification for valuing scientific claims over claims by other ideologies like religion. Indeed, he was quite indignant about the condescending attitudes of many scientists towards alternative traditions such as astrology and complementary medicine.  In Feyerabend’s view, science can be a repressing ideology in society instead of a liberating movement; he thought that a pluralistic society should be protected from being influenced too much by science, just as it is protected from other ideologies.

This pluralistic view, that science does not have a monopoly on truth and its authoritarian status in society should be questioned, went on to become a major tenet of the modern discipline of Science and Technology Studies.

Criticisms

1. Feyerabend’s view of science is considered radical but interesting by many philosophers of science. However, one obvious criticism is that the comparison of science with cultural traditions such as religion doesn’t seem to stand up; faced with experimental evidence to the contrary, scientists do, eventually, change their story – unlike religion. No scientific theory that is in conflict with observation survives over time.

2. A criticism from historians of science is that Feyerabend often backs his thesis by choosing the science of Galileo; time and again, Galileo is portrayed as an example of a scientist in rebellion against the science of the day. The problem with this example is that it can be argued that what we now consider the scientific method was developed after Galileo, not before; the invention of instruments such as the telescope and the microscope led to the evolution of the sophisticated method of hypothesis and experiment we call the scientific method today. Hence the Galileo-as-rebel-against-the science-of-the-day narrative is questionable.

3. A general criticism from scientists is that an extraordinary thesis requires extraordinary evidence. Instead, Feyerabend’s thesis is based on case studies from the history of science that are debatable (see above, and last post), despite his meticulous research. Indeed, Feyerabend is sometimes accused of either misunderstanding or misrepresenting science in his examples. [For example, Feyerabend claims that the Newtonian view of gravitational acceleration was rebellious because it was in conflict with that of Galileo; most physicists consider this argument to be dead wrong. Newtonian mechanics deals with gravitational acceleration in a far more general way than Galileo, but it reduces to the Galilean case for an object is close to the earth’s surface; hence Newton is not in conflict with Galileo].  This example is fairly typical and raises concerns. Philosophers infer general conclusions from isolated case studies in the history of science; this is not ideal and it’s even more problematic if the case studies used are questionable.

4. On the other hand, Feyerabend’s idea of scientific imperialism is considered very important indeed and led to many studies that suggest that the use of science in society has not always beneficial, including studies that show that claims of scientific legitimacy were sometimes used by the state to introduce unpopular and unnecessary measures on populations..more on this later.

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Kuhn vs Popper; the philosophy of Lakatos

We saw earlier that Kuhn described scientific knowlege as progressing in a very different way from Popper. One attempt to reconcile their very different views was provided by the philosopher Imre Lakatos. Lakatos attempted to reconcile the two views of science by replacing Kuhn’s concept of the scientific paradigm with his own concept of the progressive research programme.

Imre Lakatos

Recall that Popper described science as progressing by a process of falsification; theories whose predictions conflict with experimental observation are soon discarded, and science progresses as a process of elimination. Kuhn saw this as an idealist view of science; a study of the history of science led him to view science as consisting of periods of ‘normal science’ in which experiment and theory are performed within a particular paradigm, with scientists holding on to their theories in the face of anomalies. Very occasionally, the reigning paradigm is overturned, but even when such a paradigm shift occurs, it is not based on reason alone because observation is influenced by the paradigm in which it occurs (see previous post for details).

The Lakatos view of science lies in between the two views above. The key to his contribution lies in what we understand by a ‘theory’; Lakatos suggested that in science, a ‘theory’ is really a succession of of slightly different theories and experimental techniques developed over time that all share a common hard core; such a collection he named the research programme. Scientists working within a given research programme shield the core from falsification with a protective belt of auxiliary hypotheses. The question of whether a worldview is true of false is replaced by the question of whether a research programme is progressive or degenerating. A progressive research programme is characterized by growth, prediction of novel facts and more precise predicitions etc. In contrast, a degenerative program is marked by a lack of growth; its auxiliary belt does not lead to novel predicitions that are later verified.

Note first that Lakatos’s idea of the research programme leads to a more nuanced version of Popper’s falsifiability; instead of theories being summarily rejected at the first conflict with observation (see earlier post), science is now seen to proceed by continually adjusting and developing the protective belt aound the hard core of a research programme; this is a systematic process that forms part of normal science. [It’s worth noting that Lakatos was a student of Popper and considered the Popperian viewpoint to be oversimplified by Kuhn and others].

Lakatos’s view is very different to that of Kuhn.  By replacing the notion of the paradigm with the notion of the research programme complete with hard core and auxiliary belt, Lakatos legitimizes the action of scientists of expanding the auxiliary belt in order to preserve the hard core of the research programme as far as possible. This is a rational process. More importantly, when a paradigm shift does occur, the shift occurs from a degenerative research programme to a more progressive one; hence the paradigm shift is rational, not irrational as seemingly suggested by Kuhn.

Criticisms

Among scientists, Lakatos is not as well known as Popper or Kuhn, but many of those familiar with his work find his view of science more nuanced than Popper, and more reasonable than Kuhn. The lLakatos concept of the research program certainly avoids the Popperian problem of ‘falsification at the first fence’ (see above). At the same time, Lakatos’s view of the replacement of one research programme by a more progressive one according to a rational process seems more reasonable than Kuhn’s irrational paradigm shifts. It neatly avoids the Kuhnian paradox of incommensurable paradigms and goes some way to explaining how science really does make progress.

On the other hand, the Lakatos view of science was severely criticized by philosophers such as Paul Feyerabend; we will look at Feyerabend in the next post.

However, before we consider any more philosophers, it’s a good time to note a more general criticism of the philosophy of science from some scientists. As we explore the views of different philosophers, you will have noticed that we seem to be building up a repository of who said what (Popper sees science in one way, Kuhn in another, Lakatos yet another). How can we ever know which view is the more valid? Many empirically-minded scientists see this as a fundamental problem; there are no controlled experiments one can do to distinguish between competing models – unlike in science itself. The evidence philosophers of science offer to support their views is based on reason, interviews  and case studies from the history of science, but the latter can often be interpreted in many different ways. This is a very different process to the testing of theory against experiment carried out by scientists (however flawed). So to hardened empiricists, this is the great irony; while philosophers and sociologists of science like Kuhn and Feyerabend seem to take a skeptical view of science, they arrive at that view using a methodology that ould be  considered less rigorous than the scientific method (flawed though the latter may be). Perhaps this is one reason some practicing scientists take only a marginal interest in the views of the philosophers and sociologists of science…it is an example of the battle between the two cultures of science and humanities articulated by the physicist C.P. Snow.  I think the answer to this criticism is that one cannot/should not expect philosophers to use the empirical methods of science for enquiry that is outside of science; this does not make their views any less important…see comment 5 for an excellent exposition on this.

Comment

[Saying that philosophy and social science is less rigourous that physical science kind of misses the whole point, doesn’t it, Cormac? It’s like saying, “The only knowledge worth having is the knowledge that we can be sure we know.” Leaving aside for the moment the debate on the social construction of facts, the reason we have social science and philosophy isn’t to get at “the truth,” but to be able to think more critically about the structure of our (sociotechnical) world. For instance, a value in an approach like actor-network theory is its ability to get us thinking about the role both human and non-human things play in stabilising what we take to be “real”. Is ANT valid? I think that’s a nonsensical question. Is it useful? Certainly, in many cases it provides ways of thinking about our world that other approaches to not bring out. It is, then, at least valuable.

That scientists only take a marginal interest in social sciences and philosophy reflects, I think, a belief that the knowledge these fields provide is not relevant to conducting scientific research. But if a scientist is trying to build a lab, get funding, get published, or engage in policy debates (e.g. over climate change) then they would be walking blind.]

Comment by Sam | February 13, 2011 | Edit | Reply

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Kuhn’s philosophy of science part II

Having considered the views of the logical positivists and of Karl Popper, it’s probably a good idea to review the philosophy of Thomas Kuhn before we go any further with Alex’s lectures series. Also, my earlier treatment of Kuhn was very much the scientist’s view, let’s now consider the more radical arguments contained in The Structure of Scientific Revolutions.

Thomas Kuhn

Recall first two central themes of Kuhn’s approach:

(i) Most of the time, science proceeds as ‘normal’ science. Theory and experiment takes place within a given paradigm ; this paradigm consists of a set of fundamental theories and assumptions that are accepted by all members of the community (and includes a view of what future research will look like and how it should be tackled). Normal science is performed within the paradigm i.e. apparent mismatches between theory and experiment are addressed within the paradigm. Indeed, it is exactly the job of the scientist is to resolve such puzzles without shaking the foundations of the paradigm.

(ii) Very occasionally, enough anomalies build up that scientists begin to lose confidence in the basic paradigm itself; a point is reached when there are simply too many phenomena that cannot be explained in the context of the reigning paradigm. A this point, extremely fundamental ideas can be critically questioned and the stage is set for a new paradigm to emerge.

Both the above points are accepted by scientists nowadays, mainly because many great revolutions in science can be described quite well in terms of a model of paradigm shift, rather than science as a linear process. [Good examples are the shift from the earth-centered view of the solar system  (Ptolemy) to the sun-centered one (Copernicus), and the shift from Newton’s theory of gravitation to Einstein’s relativity]. In both cases, science did not progress as a linear, cumulative process; instead, enough anomalies emerged to cause a crisis that resulted in the overthrow of the dominant paradigm and the ushering in of the new.

However, Kuhn has two further themes that are uncomfortable for scientists:

(iii) Kuhn insisted that reason alone cannot account for a paradigm shift. In his view, the transfer of allegiance to a new paradigm is not purely on the basis of objective evidence, but owes much to peer pressure, groupthink and other social factors. The main reason this can happen is that ‘facts’ gathered about the world are not objective but paradigm-driven, i.e. scientific observations derive their meaning from the background theory in which they are carried out.

(iv) As a consequence, it is not a given that the new paradigm is a better fit to nature than the old. Instead, it is simply a different worldview. In fact, it is impossible to compare the two because the new paradigm is incommensurable with the old;  because the two paradigms involve two different worldviews, supporters of each see observational data through different lenses and simply talk past each other.

Criticisms

1. Kuhn’s view of the subjectivity of paradigm shifts is informed by what philosophers call the problem of the ‘theory-ladeness’ of data. While the logical positivists firmly believed that observational data exists independent of theory (and therefore provides an objective court between competing theories), Kuhn argued that our measurement of data can never be fully independent of theory; all observations are couched in terms of some theory (e.g. to report that a current of 0.5 amps in a circuit involves an acceptance of the concept of electric current etc). This view is worrying, because if all observations are paradigm-contingent, there is no reason to believe that science progresses i.e. that the Copernican view of the solar system is a better model of nature than the geocentric model; according to Kuhn, all our ‘supporting observations’ (planetary orbits, black holes etc) are really determined by the current theory. However, this viewpoint seems to defy common sense at least to some extent, especially when one thinks of the technological application of modern science (if quantum physics is simply a point of view, how does a laser work?). Indeed, it raises questions about what we can ever know about reality.

Many philosophers of science resolve the paradox by suggesting that Kuhn’s view of theory-laden data is too radical. In fact, scientific data is not completely theory-laden; while the positivist’s view of objective evidence may be an impossible ideal, it doesn’t follow that all observation is contaminated by theory. Hence, scientists working within different paradigms can in fact compare data meaningfully. For example, a Copernican and pre-Copernican may not agree on a model of the universe, but they can certainly agree on measurements of the orbit of Mars. The fact that at least some observations can be agreed on allows scientists to have meaningful debates about which model best resembles the data.

2. Many scientists take a dim view of Kuhn’s idea of the incommensurability of old and new paradigms, pointing out that the clear-cut change in worldview he sees is much too simplistic. To cite a specific example used by Kuhn himself, it is quite inaccurate to describe Newtonian physicists and Einsteinian physicists ‘talking past each other’. In fact, there is no such thing as a Newtonian physicist or an Einsteinian physicist. Every physicist is trained in classical Newtonian physics and we use Newtonian physics in physics routinely (for example to launch rockets to the moon). The only time we don’t use it is in extreme cases (when dealing with objects traveling at extremely high speed or objects that are extremely massive, when relativistic effects become significant). So while relativity certainly entails a different worldview (Newtonian mechanics deals with space and time as a fixed stage independent of the universe, whereas relativity sees a dynamic spacetime that can be affected by the universe), the equations of relativity reduce to Newtonian mechanics in all but the most extreme cases. In this sense, relativity does not ‘replace’ Newtonian mechanics, it encompasses it; most importantly, it is certainly not incommensurable with it. [This example of theories building on one another is very common in science. Even quantum theory, a theory that is in many ways radically different to classical physics, builds to some extent on well-established concepts in classical physics.Indeed, a standard approach to problem-solving in quantum physics is to frame the problem in a classical viewpoint first].

Update

In later years, Kuhn seemed to row back somewhat on the concepts of theory-ladeness of data and incommensurability. While his intention had been to provide an alternate philosophy of science to that of the logical positivists, he was dismayed to see his views adopted by anti-science groups that wished to portray science as a non-rational activity, or by groups that saw scientific discovery as the view of one particular culture (cultural relativism). Meanwhile, sociologists took a keen interest in Kuhn’s work. Indeed, it was precisely the more radical of his ideas that were to form the foundation of a new movement, the sociology of scientific knowledge which nowadays forms part of a discipline known as Science and Technology Studies.

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