How Thomas Kuhn can help us take science seriously — NEWPOLITY
Logan Paul Gage
An argument from theology will get you nowhere; an argument from one's personal experience is moot; but an argument of science stirs us to assent.
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NEWPOLITY
This makes sense, because liberalism is predicated on neutrality. Liberal states have no state churches, official belief systems, philosophies or theologies. Such opinions are the private quirks of individual minds, the truth or falsity of which is irrelevant to a primary "public" knowledge about matters of law, policy, public interest, and the like. This public knowledge is neutral, in the sense that it is objective, applying to everyone, and if one is going to make headway in a liberal state, one must check one's private, opinionated language at the door.

The language of science fits well into this schema, because it has, likewise, taken up what appears to be a neutral, objective, dispassionate stance of determining the cold, hard facts. The person who speaks from the perspective of science is able to speak apart from any merely private opinion, club, faction or denomination of belief. He speaks as a qualified expert, a position which indicates his disinterested removal from the moods and paradigms of the moment, and his unique ability to access the objective, unvarnished truth.

But is this really how the scientific community operates? In 1962, Thomas Kuhn wrote his ground-breaking book The Structure of Scientific Revolutions, in which he argues that scientific consensus is not neutral and disinterested, but emerges out of paradigms held by factions and in-groups devoted to their own survival. It is, hands down, the single most influential work of philosophy of science in the last century. It’s core message, however, has not filtered down to popular culture, because questioning the disinterested status of science is, peripherally, to question the disinterested neutrality of liberal nation states.

Science Textbooks

Kuhn begins by thinking about the textbooks from which we all learn about science and how they form our minds. He worries that the image of science they present is as glossed over as a tourist brochure.[1] Textbooks tend to praise the achievements of great lone scientists and downplay science as a communal, cultural enterprise. Perhaps most perniciously, because of their aim of getting novices up to speed so that they can understand (and even practice in) today’s scientific landscape, they select episodes in the history of science and arrange them in a seamless narrative all leading to…us, scientific modernity. Inevitably, this has the effect of confirming our positivist prejudices; it makes science look like a straight line of progress, only opposed by the forces of superstition.

If you look at the actual revolutions of thought in the history of science, Kuhn argues, this isn’t what you’ll see. Science is done by real human beings. Its history is a history of fights between groups of scientists not only over particular facts but over method and what counts as science at all. By uncovering the personal and social dimensions of science, Kuhn ushered in the “historical” or “sociological” turn in philosophy of science.

Kuhn’s historical studies paint a far more nuanced and interesting picture of science. Its history is more than the history of ideas; it is also a history of real people, with all their flaws and foibles. There is more to science than facts simply presenting themselves to great minds. It is a history of genius and innovation, sure. But it is also a history of cliques, defending theories despite counter-evidence, and dead ends. But these never make it into the textbooks, both because it would undermine the progressive, positivist narrative that is meant to attract new scientists to the discipline, and also because stories of dead ends don’t help students learn current scientific theories. Any history that includes successes but never failures is bound to look linear and progressive.[2] Yet the effect, Kuhn thinks, is a picture of science that is pure science fiction.

Normal vs. Revolutionary Science

According to Kuhn, most science—what he calls “normal science”—is not revolutionary. That is, it doesn’t set out to answer groundbreaking questions but to slightly extend our knowledge in some very limited domain. Normal science doesn’t question its foundations but, rather, works within a paradigm or large set of settled assumptions about its subject matter.[3] Now, paradigms can sound very negative, because their job is to be settled and dogmatic, to force us to view nature in preconceived categories and rigidly indoctrinate students. And this is indeed a major lesson of Kuhn’s work. However, the advantage of paradigms is that the scientist doesn’t have to constantly justify her basic outlook but can treat some things as settled and dive deeper into nature on those assumptions. Kuhn likens it to a settled judicial decision.[4] In this way, real but limited progress is made.

But there are also periods of science where there is a sense of unease and dissatisfaction with the reigning paradigm. Kuhn especially has in mind the growing unease with the increasingly baroque Ptolemaic model of the solar system. In these revolutionary periods, fundamental assumptions are challenged.

Importantly, this is not a dispassionate process by which the evidence is obvious to all and the best theory automatically wins out. Kuhn’s historical study revealed that new paradigms are created not by seasoned veterans of the field but by the young or those new to the field who haven’t had their minds ossified by years of thinking in the old paradigm.[5] Instead of convincing the old guard, advocates of the new paradigm simply attract more young scientists to their research program (e.g., they attract more graduate students with an exciting new way of thinking).

And the minute the new paradigm wins out, say, the Copernican model, its rivals are ridiculed as “non-scientific.” The old guard is shunned, their work ignored.[6] The revolution does not take place because the old guard become convinced by overwhelming evidence, see the light, and recant. (That is to say, the scientists do not actually behave scientifically, disinterestedly following the evidence wherever it leads.) Rather, the revolution happens when they die off. The historical record, he argues, challenges the positivist narrative of science as uniquely rational and automatically progressive. Science isn’t populated by Spock-like, neutral, open-minded observers following the evidence wherever it leads. It is populated by actual humans.

Kuhn originally argued that there is a chaotic and competitive pre-paradigm period where the field has no consensus and competing theories jockey for dominance; then a breakthrough that establishes a new paradigm; followed by a long period of normal science; until anomalies with that paradigm build up; a crisis occurs; and we get the next revolutionary event, the new paradigm, and a period of normal science again.

No paradigm can solve all problems. In fact, if it did, there would be no normal science to do. So new paradigms have unsolved problems for which they issue promissory notes; it is only a matter of time, it insists, until the problems are solved. These puzzles may or may not fester and come to be seen as problems. Whether puzzles become problems and create a “crisis” has much to do with the particular psychological and sociological facts about the research community. As Kuhn writes, “every problem that normal science sees as a puzzle can be seen, from another viewpoint, as a counterinstance and thus as a source of crisis.”[7]

In cases as diverse as the Copernican revolution in astronomy, Lavoisier’s oxygen theory of combustion in chemistry, and the emergence of Einsteinian relativity theory in physics, puzzles had to seem like problems—like a crisis—before radically new thinking could emerge. And what feels like a crisis is highly dependent on the particular personalities involved.[8] For instance, some astronomers began to see Ptolemaic epicycles (circles upon circles) as clunky and aesthetically displeasing while others did not. There were also social factors like the need for a new calendar, the growing dislike of medieval Aristotelianism, and the rise of Renaissance Platonism.

New theories are responses to a felt crisis, a personal and social phenomenon—perhaps caused by the evidence but certainly not necessitated by it. Aristarchus, for instance, anticipated Copernicus by almost two millennia. But the social setting was not ready for the new theory. Leading thinkers felt no dissatisfaction with the Ptolemaic model. This evidences against the simple positivist view of science as a slow ratcheting up of observations leading to the formation of obviously true theories to account for the data. The right scientific theory does not emerge automatically.

Paradigms: The Good, the Bad, and the Ugly

Kuhn originally thought that, “there can be a sort of scientific research without paradigms” in the pre-paradigm period.[9] But he later amends the first step to claim that instead of a period with no paradigm, this period of extraordinary science is one in which there are competing articulations of the standard paradigm, discontent with the dominant articulation of it, and an openness to new methods and rethinking the problem.[10] In other words, he increasingly saw that we never view the world without a framework or paradigm. Paradigms can distort our vision, but they also make vision possible by organizing a sea of chaotic data into a pattern.

The late 20th Century saw an increasing recognition that the received view’s understanding of facts and theories is too simple. From the Scientific Revolution to the Logical Positivists it was claimed that rational scientists must be presuppositionless machines who go around collecting pure facts until theories emerge pristine from the data. We all sympathize with this view, since we want our theories to be responsive to facts rather than our hopes and wishes.

But philosophers began to notice that we don’t just see the world but that we see under a description. We don’t just see, but we see as.[11] If you’ve seen a Magic Eye drawing and then suddenly your mind recognizes a pattern and you see the unified image of a car in what had previously appeared as a bunch of colors, then you’ve noticed this yourself. Or perhaps you’ve had this experience with one of the famous Gestalt images like the drawing that is simultaneously a young lady and an old lady, or Wittgenstein’s duck-rabbit. You tend to see the image one way at first, but then with effort you can see the image the other way. But once you lock on to the second image, it becomes difficult to see the original one. Your shift in perspective, it is important to notice, is not simply caused by new evidence or data. It has to do with how the existing data is imagined, conceptualized, or interpreted.

Rather than thinking our prior beliefs and expectations “pollute” our pure experiences, we should thank God that they do. We’d be stuck in a world of sensations rather than objects if we couldn’t bring concepts to bear in our visual processing. We don’t infer all our theories from sensations. Aristotle and Aquinas recognized this long ago. They didn’t build their epistemology on animal sensations but on our ability to perceive natures and thereby populate our minds with ordinary concepts like humans, apples, and cats.

Still, paradigms do restrict our vision. They limit our focus. But Kuhn insists that this is not all bad, even claiming that it is “essential to the development of science.”[12] Paradigms give us a kind of mental stability: they are fixed points of reference. It is a fully rational thing not to give up your old point of view for a new one at every turn. If everything was up for grabs at all times, we’d never make any headway. Paradigms allow scientists to stop arguing about fundamental issues and start solving puzzles from within the paradigm. The paradigm tells them what questions are significant enough to explore and how to go about answering them (i.e., via paradigmatic experiments). Half of the work is already done for the scientist by the paradigm.

Consensus

It is often argued that science is, unlike religion and philosophy, characterized by consensus and wide-spread agreement. Therefore, it uniquely promises to make progress and solve problems. However, with the notion of paradigms, I hope we can see Kuhn’s view of the matter: science is characterized by consensus because scientists are taught the same paradigm in graduate school and the community enforces a rather rigid orthodoxy. Vocal questioners of the paradigm, no matter how credentialed, have trouble publishing in mainstream journals and presses, are unlikely to receive tenure, and are effectively excommunicated by being labeled science deniers or pseudo-scientists.

I saw this happen with a friend who holds two excellent Ph.D.s and held a joint appointment between the NIH and the Smithsonian. When it became suspected that he harbored scientific doubts about the power of the neo-Darwinian selection-mutation mechanism and might even be open to an intelligent design explanation for features of the living world, he was harassed by his colleagues who even hid his specimens so that he could not continue his research. This is highly ironic in light of the positivist narrative of medieval orthodoxy enforced by the Inquisition.

Science & Metaphysics

At any rate, for Kuhn, paradigms are larger than just a certain explanation for how this or that natural thing functions. The paradigm sets rules about which scientific laws hold, which methods are truly scientific, and even contains the “quasi-metaphysical commitments that the historical study [of science] so regularly displays.”[13] Consider the corpuscular theory of matter, which supposed all matter to be composed of minute particles. This was not just pure “science.” This was a metaphysical commitment that thinkers like Hobbes, Descartes and Newton called “scientific” and which served to guide their research and the solutions they deemed acceptable. They went about looking for laws specifying corpuscular motion and corpuscular interaction; those were the only explanations deemed properly scientific. Or think of Einstein’s development of four-dimensionalism, where space and time are part of a single manifold. Surely this is both a scientific and metaphysical theory.[14]

So when Catholic intellectuals make a hard and fast (and, frankly, positivist) distinction between what is science and what is metaphysics, I hope you can understand why people like me get uneasy. It isn’t because we think there is no difference in general. Metaphysicians don’t normally put things in test tubes. But there is far more overlap than the rigid distinction recognizes.[15] The reason is that scientists are trying, just like philosophers, to tell us what reality is really like. As Einstein understood, “every true theorist is a kind of tamed metaphysicist, no matter how pure a ‘positivist’ he may fancy himself.”[16]