: While thought experiments play an important role in contemporary analytic philosophy, much remains unclear about thought experiments. In particular, it is still unclear whether the judgments elicited by thought experiments can provide evidence for the premises of philosophical arguments. This article argues that, if an influential and promising view about the nature of the judgments elicited by thought experiments is correct, then many thought experiments in philosophy fail to provide any evidence for the premises of philosophical arguments.

Counterfactual thought experiments in history have become increasingly popular in the last two decades, and a new and controversial branch of history has originated from their use: counterfactual history, also known as virtual history. Despite its popularity amongst the general public, most academic historians consider historical counterfactuals as having little epistemic value. This paper investigates three alleged uses of counterfactual thinking in historical explanations: the claim that counterfactual thinking gives historians useful insights; that it is a useful tool to evaluate (...) an event’s causal significance; that it shows much of history to be essentially ‘chaotic’. I argue that only convincingly justifies the use of counterfactual thought experiments in history, as it allows historians to illustrate how they perceive events’ degrees of sensitivity to changes to their causal history, being an important part of providing a causal explanation. (shrink)

Thought experiments and simulation experiments are compared and contrasted with each other. While the former rely on epistemic transparency as a working condition, in the latter complexity of model dynamics leads to epistemic opacity. The difference is elucidated by a discussion of the different kinds of iteration that are at work in both sorts of experiment.

the history and philosophy of thought experiments has attracted considerable attention in recent years. Of particular interest to philosophers as well as historians of science has been the emergence of thought experiments as a common procedure in early modern science, along with the methodological presuppositions that underwrite this practice.1 From a philosophical perspective, the notion of thought experiments is intimately tied in with the much-debated connection between conceivability and possibility, as exemplified by the radical affirmation of the Conceivability Criterion of (...) Possibility by David Hume.2 Consequent upon this, historians of ancient and medieval philosophy have also expressed interest in .. (shrink)

I wish to explore the idea that thought experiments are best accounted for as a special case of a narrative that features an interplay between puzzles and paradoxes. Furthermore, I believe the more successfully thought experiments manage to combine puzzles and paradoxes the more insightful and instructive they become. I suggest the latter kind of thought experiments also use the technique of mental variation.

The main concern of this paper is to show that understanding mental variation may prove to be relevant to inquiry into thought experiments. First, I examine why Ernst Mach considered the ability to vary the contents of one's thoughts the principal requirement for thought experimentation. Second, I illustrate the wide applicability of mental variation in thought experiments. Third, I suggest, following Kathleen Wilkes, that variation is frequently employed in “realistic” thought experiments.

Three uses of critical thought experiments outlined in the paper are related to general questions of evaluation. A proposal offered by Karl Popper concerning the so-called "apologetic" use of Gedankenexperimente is critically assessed. Specifically, his methodological principle that one should not use a second theory in order to defend a first theory against a critical thought experiment is discussed with reference to the photon-box Gedankenexperiment and the Maxwell-demon paradox. It is argued that the rescuing of one theory from conceptual anomaly (...) by appealing to another need not constitute a misuse of a critical thought experiment. (shrink)

Investigation of Empiricism. On Ernst Mach’s Conception of the Thought Experiment. The paper argues that Ernst Mach’s conception of the thought experiment from 1897/1905 holds a singular position in the lively discussions and repeated theorizations that have continued up to the present in relation to this procedure. Mach derives the thought experiment from scientific practice, and does not oppose it to the physical experiment, but, on the contrary, endows it with a robust relation to the facts. For Mach, the thought (...) experiment is a reliable means of determining empiricism, and at the same time a real, because open and unbiased, experimenting. To shed light on this approach, the paper carries out a close reading of the relevant texts in Mach’s body of writings (in their different stages of revision) and proceeds in three steps: first, Mach’s processual understanding of science will be presented, which also characterizes his research and publication practice (I. ‘Aperçu’ and ‘Sketch’. Science as Process and Projection); then in a second step the physiological and biological justification and valorization of memory and association will be examined with which Mach limits the relevance of categories such as consciousness and will (II. The Biology of Consciousness. Or The Polyp Colony); against this background, thirdly, the specific empiricism can be revealed that Mach inscribes into the thought experiment by on the one hand founding it in the memory and association, and on the other by tracing it back to geometry, which he deploys as an experimenting oriented to experience (III. Thinking and Experience. The Thought Experiment). (shrink)

The scales across which physical properties exist are vast and subtle in their effects on particular systems placed locally on such scales. For example, human experiential access is restricted only to partial segments of the mass density, size, and temperature scales of the universe. I argue that philosophers must learn to appreciate better the effects of physical scales. Specifically, thought experiments in philosophy should be more sensitive to physical scale effects, because the conclusion of a thought experiment may be undermined (...) by unintentionally ignored scale effects, and the changes required to obtain the foreground state of affairs in a thought experiment might require unacknowledged scale-spanning changes to the contextual background. I discuss four philosophical thought experiments: Putnam's Twin Earth and Brain in a Vat, Searle's Chinese Room, and Chalmers's Zombies Without Qualia. I close by briefly defending the greater interest and importance of physical possibility over logical possibility. (shrink)

How can thought experiments lead to new empirical knowledge if they do not make use of empirical information? This puzzle has been widely discussed in the philosophy of science. It arises in conceptual metaphor research as well and is especially important for the clarification of its empirical foundations. The aim of the paper is to suggest a possible solution to the puzzle of thought experiments in conceptual metaphor research. The solution rests on the application of a novel metatheoretical framework that (...) conceives of linguistic theorizing as a process of plausible argumentation. The central idea of the solution is that through the dynamic feedback mechanism of the cyclic, prismatic and retrospective re-evaluation of information, thought experiments in conceptual metaphor research may indirectly supply the process of plausible argumentation with empirical knowledge. (shrink)

In his paper ‘A Function for Thought Experiments’, T. S. Kuhn asks: Ought we demand of our concepts, as we do of our laws and theories, that they be applicable to any and every situation that might conceivably arise in any possible world? Is it not sufficient to demand of a concept, as we do of a law or theory, that it be unequivocally applicable in every situation which we expect ever to encounter?

1. Reflecting on possible cases can be very valuable in differing ways. Sometimes it makes clear a consequence of a theory, a consequence that then plays an important role in debates about the theory. Utilitarians who favour maximising average happiness confront utilitarians who favour maximising total happiness with possible cases where there are enormously many sentient beings whose lives are barely worth living. Sometimes reflecting on possible cases serves to clarify a doctrine. Classical versions of consequentialism value equity for its (...) good results; they don't value it per se. What this means is that in cases where we have two actions alike in the value of their consequences but differing in that one delivers a more equitable distribution, classical consequentialism treats the two actions as morally equivalent. Sometimes reflections on possible cases reveal relationships that are not immediately obvious. Take Galileo's famous thought experiment directed against the view that the heavier a body is the faster it falls in a vacuum. He describes a possible case where the only way to retain the view requires embracing independently implausible views about how various ways two bodies are connected to each other make a big difference to how fast the joined bodies fall. The thought experiment reveals a connection that might otherwise escape notice.This reminds us that we should not expect a uniform answer to the question, What role do thought experiments play? However, it is conventional wisdom that very often their role is to make trouble for one or another proffered conceptual analysis. Take two thought experiments that have been found especially compelling by the analytical philosophical community: Edmund Gettier's examples of true, justified belief, where the beliefs are true by some kind of fluke, and Ned Block's example of a being that makes ‘intelligent’ responses to the challenges the …. (shrink)

What sorts of things are the intuitions generated via thought experiment? Timothy Williamson has responded to naturalistic skeptics by arguing that thought-experiment intuitions are judgments of ordinary counterfactuals. On this view, the intuition is naturalistically innocuous, but it has a contingent content and could be known at best a posteriori. We suggest an alternative to Williamson's account, according to which we apprehend thought-experiment intuitions through our grasp on truth in fiction. On our view, intuitions like the Gettier intuition are necessarily (...) true and knowable a priori. Our view, like Williamson's, avoids naturalistic skepticism. (shrink)

Despite their centrality and importance to both science and philosophy, relatively little has been written about thought experiments. This volume brings together a series of extremely interesting studies of the history, mechanics, and applications of this important intellectual resource. A distinguished list of philosophers and scientists consider the role of thought experiments in their various disciplines, and argue that an examination of thought experimentation goes to the heart of both science and philosophy.

To what extent can philosophical thought experiments reveal norms? Some ethicists have argued that certain thought experiments reveal that people draw a morally significant distinction between "doing" and "allowing". I examine one such thought experiment in detail and argue that the intuitions it elicits can be explained by "prospect theory", a psychological theory about the way people reason. The extent to which such alternative explanations of the results of thought experiments in philosophy are generally available is an empirical question.

. What are thought experiments, and how do they generate knowledge? More specifically, what sorts of intentional acts must one perform in order to carry out a thought experiment, what sorts of objects are such acts directed toward, and how are those objects made present in such acts? I argue on phenomenological grounds that the proper objects of thought experiments are, in certain cases, uninstantiated universals and relations among them. I will also argue that, in the best of cases, we (...) intuit or “see” these universals and their relations to one another, and respond to some objections to this view. (shrink)

It is a commonplace that in philosophy, intuitions supply evidence for and against philosophical theories. Recent work in experimental philosophy has brought to bear the intuitions of philosophically naïve subjects in a number of different ways. One line of response to this work has been to claim that philosophers have expertise that privileges their intuitive judgments, and allows them to disregard the judgments of non-experts. This expertise is supposed to be analogous to the expertise of the mathematician or the physicist. (...) This paper critically evaluates this appeal to philosophical expertise. (shrink)

Hylomorphism offers a third way between animalist approaches to personal identity, which maintain that psychology is irrelevant to our persistence, andneo-Lockean accounts, which deny that humans are animals. This paper provides a Thomistic account that explains the intuitive responses to thought experiments involving brain transplants and the transformation of organic bodies into inorganic ones. This account does not have to follow the animalist in abandoning the claim that it is our identity which matters in survival, or countenance the puzzles of (...) spatially coincident entities that plague the neo-Lockean. The key is to understand the human being as only contingently an animal. This approach to our animality is one that Catholics have additional reason to hold given certain views about purgatory, our uniqueness as free and rational creatures, and our having once existed as zygotes. (shrink)

Descriptions of Gettier cases can be interpreted in ways that are incompatible with the standard judgment that they are cases of justified true belief without knowledge. Timothy Williamson claims that this problem cannot be avoided by adding further stipulations to the case descriptions. To the contrary, we argue that there is a fairly simple way to amend the Ford case, a standard description of a Gettier case, in such a manner that all deviant interpretations are ruled out. This removes one (...) major objection to interpreting our judgments about Gettier cases as strict conditionals. (shrink)

Contemplating imaginary scenarios that evoke certain sorts of quasi‐sensory intuitions may bring us to new beliefs about contingent features of the natural world. These beliefs may be produced quasi‐observationally; the presence of a mental image may play a crucial cognitive role in the formation of the belief in question. And this albeit fallible quasi‐observational belief‐forming mechanism may, in certain contexts, be sufficiently reliable to count as a source of justification. This sheds light on the central puzzle surrounding scientific thought experiment, (...) which is how contemplation of an imaginary scenario can lead to new knowledge about contingent features of the natural world. (shrink)

Through careful analysis of a specific example, Parfit’s ‘fission argument’ for the unimportance of personal identity, I argue that our judgements concerning imaginary scenarios are likely to be unreliable when the scenarios involve disruptions of certain contingent correlations. Parfit’s argument depends on our hypothesizing away a number of facts which play a central role in our understanding and employment of the very concept under investigation; as a result, it fails to establish what Parfit claims, namely, that identity is not what (...) matters. I argue that Parfit’s conclusion can be blocked without denying that he has presented an imaginary case where prudential concern would be rational in the absence of identity. My analysis depends on the recognition that the features that explain or justify a relation may be distinct from the features that underpin it as necessary conditions. (shrink)

By carefully examining one of the most famous thought experiments in the history of science—that by which Galileo is said to have refuted the Aristotelian theory that heavier bodies fall faster than lighter ones—I attempt to show that thought experiments play a distinctive role in scientific inquiry. Reasoning about particular entities within the context of an imaginary scenario can lead to rationally justified concluusions that—given the same initial information—would not be rationally justifiable on the basis of a straightforward argument.

The capacity to represent things to ourselves as possible plays a crucial role both in everyday thinking and in philosophical reasoning; this volume offers much-needed philosophical illumination of conceivability, possibility, and the relations between them.

Building on a previously published contextualization of Marco Buzzoni’s Neo- Kantian account of scientific thought-experiments, this paper examines the explanatory power of this account. It is argued that Buzzoni’s account suffers from a number of shortcomings. Einstein’s clock-in-the-box thought experiment facilitates the demonstration of these deficits. In the light of both the identified inadequacies of Buzzoni’s account and the long-standing history of Kantian approaches to thought experiments, this paper finally sketches an alternative Neo-Kantian account. This alternative utilizes Michael Friedman’s reading (...) of Kant’s a priori within a Kuhnian account of thought experiments along the lines of conceptual constructivism as anticipated by Georg Lichtenberg and further developed recently by Tamar Gendler. (shrink)

Philosophical debate about the nature and function of thought experiments would be impoverished without good historical sources. And while valuable work is being done on the history of thought experiments, a comprehensive discussion of the history of philosophical investigation into thought experiments is still absent in the literature (but see Kühne 2005; Moue et al. 2006). In what follows we take the first steps towards providing a more complete picture of the diverse attempts to shed light on thought experiments.The term (...) “thought experiment” made its first appearance about 200 years ago in 1811. The most prolific period in the history of the philosophical investigation into thought experiments is the current .. (shrink)

Marco Buzzoni has presented a Kantian account of thought experiments in science as a serious rival to the current empiricist and Platonic accounts. This paper takes the first steps of a comprehensive assessment of this account in order to further the more general discussion of the feasibility of a Kantian theory of scientific thought experiments. Such a discussion is overdue. To this effect the broader question is addressed as to what motivates a Kantian approach. Buzzoni's account and the assessment developed (...) in this paper are warranted by the fact that the history of philosophical inquiry into thought experiments is deeply interwoven with Kant's philosophy. This history will be depicted here for the first time in more comprehensive terms to contextualize Buzzoni's account in historical and systematic perspective. (shrink)

Wie ist es wohl, eine Fledermaus zu sein? Wäre ein rein physikalisches Duplikat von mir nur ein empfindungsloser Zombie? Muss man sich seinem Schicksal ergeben, wenn man sich unfreiwillig als lebensnotwendige Blutwaschanlage eines weltberühmten Violinisten wieder findet? Kann man sich wünschen, der König von China zu sein? Bin ich vielleicht nur ein Gehirn in einem Tank mit Nährflüssigkeit, das die Welt von einer Computersimulation vorgegaukelt bekommt? Worauf beziehen sich die Menschen auf der Zwillingserde mit ihrem Wort 'Wasser', wenn es bei (...) ihnen gar kein H2O gibt? -/- Diese und weitere seltsame Fragen sind das tägliche Brot vieler professioneller Philosophen. Die abstrusen Umstände, die dabei geschildert werden, nennt man "Gedankenexperimente". -/- Was soll die Erörterung dieser Szenarien, die sich so weit von unserem alltäglichen Leben, z.T. außerhalb der Grenzen unserer Wirklichkeit abspielen? Welche Rolle spielen diese "Gedankenexperimente" in der philosophischen Methodologie? Ist diese Rolle überhaupt berechtigt? -/- Das vorliegende Buch gibt Antworten auf diese Fragen. Es stellt sich heraus, dass diese seltsamen Gedankenexperimente nicht nur berechtigte, sondern überaus wichtige Instrumente philosophischen Forschens darstellen. (shrink)

Experiments (E), computer simulations (CS) and thought experiments (TE) are usually seen as playing different roles in science and as having different epistemologies. Accordingly, they are usually analyzed separately. We argue in this paper that these activities can contribute to answering the same questions by playing the same epistemic role when they are used to unfold the content of a well-described scenario. We emphasize that in such cases, these three activities can be described by means of the same conceptual framework—even (...) if each of them, because they involve different types of processes, fall under these concepts in different ways. We further illustrate our claims by presenting a threefold case study describing how a TE, a CS and an E were indeed used in the same role at different periods to answer the same questions about the possibility of a physical Maxwellian demon. We also point at fluid dynamics as another field where these activities seem to be playing the same unfolding role. We analyze the importance of unfolding as a general task of science and highlight how our description in terms of epistemic functions articulates in a noncommittal way with the epistemology of these three activities and accounts for their similarities and the existence of hybrid forms of activities. We finally emphasize that picturing these activities as functionally substitutable does not imply that they are epistemologically substitutable. (shrink)

The arts and the sciences perform many of the same cognitive functions, both serving to advance understanding. This paper explores some of the ways exemplification operates in the two fields. Both scientific experiments and works of art highlight, underscore, display, or convey some of their own features. They thereby focus attention on them, and make them available for examination and projection. Thus, the Michelson-Morley experiment exemplifies the constancy of the speed of light. Jackson Pollock's "Number One" exemplifies the viscosity of (...) paint. Despite their similarities, science and art might seem to differ in their attitude toward facts. Science is said to adhere to facts; art, to be indifferent to them. Such, I urge, is not the case. Science, like art, often scorns fact to advance understanding through fiction. Thought experiments, I contend, are scientific fictions; literary and pictorial fictions, aesthetic thought experiments. (shrink)

Jonathan Bennett (1974) maintains that Huckleberry Finn’s deliberations about whether to return Jim to slavery afford insight into the tension between sympathy and moral judgment; Miranda Fricker (2007) argues that the trial scene in To Kill a Mockingbird affords insight into the nature of testimonial injustice. Neither claims merely that the works prompt an attentive reader to think something new or to change her mind. Rather, they consider the reader cognitively better off for her encounters with the novels. Nor is (...) her cognitive improvement restricted to acquiring new justified true beliefs about the works themselves. What the reader gleans is supposed to enhance her knowledge or understanding of the .. (shrink)

In this paper an analysis of Newton’s argument for universal gravitation is provided. In the past, the complexity of the argument has not been fully appreciated. Recent authors like George E. Smith and William L. Harper have done a far better job. Nevertheless, a thorough account of the argument is still lacking. Both authors seem to stress the importance of only one methodological component. Smith stresses the procedure of approximative deductions backed-up by the laws of motion. Harper stresses “systematic dependencies” (...) between theoretical parameters and phenomena. I will argue that Newton used a variety of different inferential strategies: causal parsimony considerations, deductions, demonstrative inductions, abductions and thought-experiments. Each of these strategies is part of Newton’s famous argument. (shrink)

Can merely thinking about an imaginary situation provide evidence for how the world actually is--or how it ought to be? In this lively book, Roy A. Sorensen addresses this question with an analysis of a wide variety of thought experiments ranging from aesthetics to zoology. Presenting the first general theory of thought experiment, he sets it within an evolutionary framework and integrates recent advances in experimental psychology and the history of science, with special emphasis on Ernst Mach and Thomas Kuhn. (...) Sorensen explores what thought experiments are, how they work, and what their virtues and vices are. In his view, philosophy differs from science in degree, but not in kind. For this reason, he claims, it is possible to understand philosophical thought experiments by concentrating on their resemblance to scientific relatives. Sorensen assesses the hazards of thought experiments and grants that there are interesting ways in which the method leads us astray, but attacks most scepticism about thought experiments as arbitrary. He maintains that they should be used--as they generally are--as part of a diversified portfolio of techniques, creating a network of cross-checks that make for impressive reliability. (shrink)

What role does the imagination play in scientific progress? After examining several studies in cognitive science, I argue that one thing the imagination does is help to increase scientific understanding, which is itself indispensable for scientific progress. Then, I sketch a transcendental justification of the role of imagination in this process.

Nicholas Rescher surveys and analyzes the different kinds of unreal possibilities and nonexistent objects, tying together all the diverse ways in which this area has been approached by philosophers. As he surveys the field and clarifies the kinds of unreality, he also makes a sustained argument against the philosophical fashion for dealing with nonexistent possible world as though they were authentic objects. The author holds that, while we may discuss possibilities, we ought not to accord them ontological status. The possibility (...) of existence of a certain sort of world is not the existence of possible world of a certain sort. While we may reasonable discuss possibilities at the generic level, such as a world where dogs have horns, this does not require a commitment to a possible world where they do. The work that theorists of logic and language want to accomplish with possible worlds and individuals can be managed with propositional manifolds, stories or scenarios, while the modalities of necessity and possibility that modal logicians want to analyze in terms of realization in possible worlds can be handled by turning instead to figuring in stories or scenarios. (shrink)

Ein Gespenst geht um in den Wissenschaften - das Gespenst des Gedankenexperiments. Gedankenexperimente verheißen Erkenntnisgewinn ohne empirische Arbeit - was vor dem Selbstverständnis der modernen Naturwissenschaften jedoch einer Unmöglichkeit gleichkommt. Und doch zieht sich das Forschen mit Gedankenexperimenten wie ein roter Faden durch die lange Tradition in den empirischen Wissenschaften von ihren Anfängen bei Stevin, Galilei und Newton bis heute.

Thought experiments being central to contemporary philosophy and science, the following questions were asked in recent literature. What is their definition? Are they heuristic devices, arguments, paradoxes? Are they comparable to real experiments? Do intuition and conceivability intervene? Equally imaginative thought experiments are found in ancient, medieval, and Renaissance texts. Paying attention to prime historical examples of thought experiments, we show that historical perspectives help answer these general questions.

Ancients and moderns alike have constructed arguments and assessed theories on the basis of common sense and intuitive judgments. Yet, despite the important role intuitions play in philosophy, there has been little reflection on fundamental questions concerning the sort of data intuitions provide, how they are supposed to lead us to the truth, and why we should treat them as important. In addition, recent psychological research seems to pose serious challenges to traditional intuition-driven philosophical inquiry. Rethinking Intuition brings together a (...) distinguished group of philosophers and psychologists to discuss these important issues. Students and scholars in both fields will find this book to be of great value. (shrink)

The second volume in the _Blackwell Brown Lectures in Philosophy_, this volume offers an original and provocative take on the nature and methodology of philosophy. Based on public lectures at Brown University, given by the pre-eminent philosopher, Timothy Williamson Rejects the ideology of the 'linguistic turn', the most distinctive trend of 20th century philosophy Explains the method of philosophy as a development from non-philosophical ways of thinking Suggests new ways of understanding what contemporary and past philosophers are doing.

This book offers a novel analysis of the widely-used but ill-understood technique of thought experiment. The author argues that the powers and limits of this methodology can be traced to the fact that when the contemplation of an imaginary scenario brings us to new knowledge, it does so by forcing us to make sense of exceptional cases.

In the final essay, the "intrinsic" nature of "qualia" is compared with the naively imagined "intrinsic value" of a dollar in ...