Unlike in physics, the category of thought experiment is not very common in biology. At least there are no classic examples that are as important and as well-known as the most famous thought experiments in physics, such as Galileo’s, Maxwell’s or Einstein’s. The reasons for this are far from obvious; maybe it has to do with the fact that modern biology for the most part sees itself as a thoroughly empirical discipline that engages either in real natural (...) history or in experimenting on real organisms rather than fictive ones. While theoretical biology does exist and is recognized as part of biology, its role within biology appears to be more marginal than the role of theoretical physics within physics. It could be that this marginality of theory also affects thought experiments as sources of theoretical knowledge. Of course, none of this provides a sufficient reason for thinking that thought experiments are really unimportant in biology. It is quite possible that the common perception of this matter is wrong and that there are important theoretical considerations in biology, past or present, that deserve the title of thought experiment just as much as the standard examples from physics. Some such considerations may even be widely known and considered to be important, but were not recognized as thought experiments. In fact, as we shall see, there are reasons for thinking that what is arguably the single most important biological work ever, Charles Darwin’s On the Origin of Species, contains a number of thought experiments. There are also more recent examples both in evolutionary and non-evolutionary biology, as we will show. Part of the problem in identifying positive examples in the history of biology is the lack of agreement as to what exactly a thought experiment is. Even worse, there may not be more than a family resemblance that unifies this epistemic category. We take it that classical thought experiments show the following characteristics: They serve directly or indirectly in the non-empirical epistemic evaluation of theoretical propositions, explanations or hypotheses. Thought experiments somehow appeal to the imagination. They involve hypothetical scenarios, which may or may not be fictive. In other words, thought experiments suppose that certain states of affairs hold and then try to intuit what would happen in a world where these suppositions are true. We want to examine in the following sections if there are episodes in the history of biology that satisfy these criteria. As we will show, there are a few episodes that might satisfy all three of these criteria, and many more if the imagination criterion is dropped or understood in a lose sense. In any case, this criterion is somewhat vague in the first place, unless a specific account of the imagination is presupposed. There will also be issues as to what exactly “non-empirical” means. In general, for the sake of discussion we propose to understand the term “thought experiment” here in a broad rather than a narrow sense here. We would rather be guilty of having too wide a conception of thought experiment than of missing a whole range of really interesting examples. (shrink)

Thought experiments provide a conspicuous case study for epistemologists of the imagination. Galileo’s famous thought experiment about falling stones is a central example in the debate about how thought experiments in science work. According to a standard interpretation, the thought experiment poses a challenge to an Aristotelian principle about falling bodies that conceives of bodies in an extremely liberal way. This chapter argues that this interpretation is implausible and then shows how the thought experiment (...) might present a challenge to a principle that conceives of bodies in a less permissive, more plausible way. The new interpretation of the thought experiment relies on a distinction between two ways of imagining Galileo’s experiment, one of which requires Aristotelians to temporarily ignore their belief in the principle under challenge. It is suggested that the distinction tracks an increasingly familiar distinction among dual-process theories in psychology: ‘intuitive’ and ‘reflective’ imagination. In order for Aristotelians to appreciate the thought experiment’s challenge to their theory, they are expected to use their intuitive imagination and not just their reflective imagination. (shrink)

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)

In lieu of an abstract, here is a brief excerpt of the content:Philosophy and Rhetoric 37.1 (2004) 21-41 [Access article in PDF] Conquering Our Imagination: Thought Experiments and Enthymemes in Scientific Argument Nathan Crick Department of Communication University of Pittsburgh The dividing line between rhetoric and science has traditionally been drawn at the split between persuasion and logic. On the one side, rhetoric seeks to influence human beliefs and behavior through use of stylistic language that resonates with the experiences (...) of an audience; on the other, science endeavors to describe empirical phenomena through the use of logical propositions that can be understood wholly on their own terms. However, recent scholarship has blurred this border. For instance, in his research on Charles Darwin's rhetorical accomplishments, John Angus Campbell has sought to break down "the neopositivist Berlin Wall separating the context of discovery from the context of justification" that represents this traditional division (1990, 23). Claiming that scientific discovery and rhetorical invention are each "an aspect of a flexible logic of inquiry and presentation" (23), Campbell argues that "the social and theological ring of Darwin's language is not merely decorative or ameliorative, but is constitutive of the fabric of his thought" (5). In other words, Campbell insists there is something intrinsically valuable about Darwin's frequent use of colloquial language beyond its immediate rhetorical appeal—it also contributes something fundamental to scientific knowledge itself.This "something," according to Campbell, is the necessary connection between argument and audience that inspires scientific theorizing and culminates in the establishment of new scientific paradigms. Within the context of discovery, the potential rhetorical audience works as a motivating force in the invention of persuasive arguments. That is why, when Darwin's notebooks are closely examined, it can "be said that virtually every note Darwin penned... was written with an eye to a public, often in response to a nameable individual" (1990, 23). Then, within the context of justification, the actual rhetorical audience works to literally fill in the necessary gaps in any rhetorical argument. That is why Darwin, in order to [End Page 21] tap into this resource, "embedded his central insight in a preexisting common world of thought and feeling" (4). Finally, it is for both of these reasons that one cannot fully reconstruct Darwin's "core concept of his argument as a logical proposition shorn of its colloquial language and associations" (4). For Campbell, "the danger in setting aside Darwin's language is that we effectively remove half of the problem he addressed and disregard the intelligence required to address it—how to present a radical idea to a particular scientific and popular audience in a way that retains the persuasive force of the very tradition it destroys" (5).Campbell's claim that rhetoric is constitutive and cannot be boiled away through logical or reductive analysis asserts the centrality of both stylistic language and audience within the process of scientific argumentation. However, although it is clear that rhetoric has a role to play during revolutionary moments in the history of science, it is not as clear that contemporary audiences cannot go directly to the logical reconstructions of past theories without any significant loss of cognitive value. Thus, we must ask whether a scientific argument, when removed from its immediate persuasive context, can nonetheless be "shorn of its colloquial language and associations" in order to reveal its logical core. What, in other words, is the relationship between the logic of scientific argumentation, the rhetorical appeal of language, and the participation of an audience?This essay suggests that a tentative answer can be found by approaching the question through the concept of the "thoughtexperiment." Thought experiments are distinguished from traditional experiments by their explicitly hypothetical quality. Instead of seeking immediately verifiable empirical results, they are designed to invite an audience to visualize a set of initial conditions and then imagine what might happen in response to those conditions. Galileo, for instance, authored one of the most famous thought experiments when he speculated what would happen if two objects of different weights were tied together and dropped. Einstein tried to envision what we might see from a clear box... (shrink)

The ongoing epistemological debate on scientific thought experiments (TEs) revolves, in part, around the now famous Galileo’s falling bodies TE and how it could justify its conclusions. In this paper, I argue that the TE’s function is misrepresented in this a-historical debate. I retrace the history of this TE and show that it constituted the first step in two general “argumentative strategies”, excogitated by Galileo to defend two different theories of free-fall, in 1590’s and then in the 1638. (...) I analyse both argumentative strategies and argue that their function was to eliminate potential causal factors: the TE serving to eliminate absolute weight as a causal factor, while the subsequent arguments served to explore the effect of specific weight, with conflicting conclusions in 1590 and 1638. I will argue thorough the paper that the TE is best grasped when we analyse Galileo’s restriction, in the TE’s scenario and conclusion, to bodies of the same material or specific weight. Finally, I will draw out two implications for the debate on TEs. (shrink)

The empirical content of the modern definition of relativity given in the Andersonian approach to spacetime theory has been overestimated. It does not imply the empirical relativity Galileo illustrated in his famous ship thought experiment. I offer a number of arguments—some of which are in essential agreement with a recent analysis of Brown and Sypel [1995]—which make this plausible. Then I go on to present example spacetime theories which are modern relativistic but violate Galileo's relativity. I end (...) by briefly discussing the prospects for improving on modern relativity. (shrink)

This essay attempts to demonstrate that it is doubtful if Galileo's famous thought experiment concerning falling bodies in his 'Dialogues Concerning Two New Sciences' (Galileo 1954: 61-64) actually does succeed in proving that Aristotle was wrong in claiming that "bodies of different weight […] move […] with different speeds which stand to one another in the same ratio as their weights," (Galileo 1954: 61). (Part I); and further that it is likewise doubtful that that argument does or (...) even can establish Galileo's own famous 'Law of Falling Bodies,' viz., that regardless of their weight all bodies fall with the same speed. (Part II). (shrink)

The paper is a contribution to the debate on the epistemological status of thought experiments. I deal with the epistemological uniqueness of experiments in the sense of their irreducibility to other sources of justification. In particular, I criticize an influential argument for the irreducibility of thought experiments to general arguments. First, I introduce the radical empiricist theory of eliminativism, which considers thought experiments to be rhetorically modified arguments, uninteresting from the epistemological point of view. Second, I present (...) objections to the theory, focusing on the critique of eliminativism by Tamar Szabó Gendler based on the reconstruction of famous Galileo's Pisa experiment. I show that her reconstruction is simplistic and that more elaborate reconstruction is needed for an appropriate assessment of the epistemic power of general argument. I propose such a reconstruction and demonstrate that general version of Pisa experiment is epistemically equal to the particular one. Thus, from an epistemological perspective, Galileo's thought experiment is reducible to a straightforward argument without particular premises. (shrink)

Thought experiments play an important epistemic, rhetorical and didactic function in Galileo’s dialogues. In some cases, Salviati, Sagredo and Simplicio agree about what would happen in an imaginary scenario and try to understand whether the predicted outcome is compatible with their respective theoretical assumptions. There are, however, also situations in which the predictions of the three interlocutors turn out to be theory-laden. Salviati, Sagredo and Simplicio not only disagree about what would happen, but they reject each other’s solutions as (...) question-begging and somtimes even dismiss each other’s thought experiments as misleading or nonsensical. (shrink)

Thought experiments can be used in various ways. A part of them seems to have a special epistemic value: they can give us a new, unknown information about reality. One of the most famous thought experiments of that kind is the thought experiment of Galileo which demonstrates that two bodies of the same kind should fall with the same speed. However, an analysis of this argument shows that it is based on several ontological presuppositions. Therefore it's (...) not the thought experiment itself that has a significance, but its correspondence to real experience. (shrink)

In this contribution I intend to reconstruct and evaluate one of Galileo's famous arguments given in the Discorsi against a well-entrenched thesis of Aristotelian physics. It will be shown that Galileo's reduction-to-the-absurd type of counterargument is, although seemingly cogent, after all fallacious. I ascribe Galileo's committing of this fallacy to his looking at the Aristotelian physics through the (Kuhnian type) paradigmatic “spectacles” of his own new physics.

This essay attempts to demonstrate that it is doubtful if Galileo's famous thought experiment concerning falling bodies in his 'Dialogues Concerning Two New Sciences' (Galileo 1954: 61-64) actually does succeed in proving that Aristotle was wrong in claiming that "bodies of different weight […] move […] with different speeds which stand to one another in the same ratio as their weights," (Galileo 1954: 61). (Part I); and further that it is likewise doubtful that that argument does or (...) even can establish Galileo's own famous 'Law of Falling Bodies,' viz., that regardless of their weight all bodies fall with the same speed. (Part II). (shrink)

At the age of sixteen, Einstein imagined chasing after a beam of light. He later recalled that the thought experiment had played a memorable role in his development of special relativity. Famous as it is, it has proven difficult to understand just how the thought experiment delivers its results. It fails to generate problems for an ether-based electrodynamics. I propose that Einstein’s canonical statement of the thought experiment from his 1946 “Autobiographical Notes,” makes most sense not (...) as an argument against ether-based electrodynamics, but as an argument against “emission” theories of light. (shrink)

Thought experiment is one of the most widely-used and least understood techniques in philosophy. A thought experiment is a process of reasoning carried out within the context of a well-articulated imaginary scenario in order to answer a specific question about a non-imaginary situation. The aim of my dissertation is to show that both the powers and the 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. ;The dissertation has five chapters: an introduction, three case studies and a conclusion. My main contention is that certain patterns of features which coincide only fortuitously may nonetheless play a central role in the organization of our concepts, and that to the extent that imaginary scenarios involve disruptions of these patterns, our first-order judgments about them are often distorted or even inverted. ;In the introduction and conclusion, I discuss the role of imaginary exceptions in the acquisition of new knowledge. I argue that appeal to imaginary cases is unavoidable because the world is neither maximally replete nor effortlessly navigable, and that appeal to exceptional cases is indispensable if we wish to avoid mistaking accidental regularities for regularities that reflect deeper truths about the world. ;In the first case study, I discuss a famous thought experiment of Galileo's, and I try to show that the guided contemplation of an imaginary scenario can provide us with new scientific knowledge in a way that argument alone cannot. In the second case study, I try to show that standard interpretations of the puzzle of the Ship of Theseus founder because they ignore the importance of the background norms against which we can make sense of local instances of extrinsically-determined identity. And in the third case study, I try to show that thought experiments in the personal identity literature are inconclusive because they disregard the explanatory role played by contingent facts about the ways human beings come into existence. (shrink)

This paper aims to formalize Galileo’s argument against the Aristotelian view that the weight of free-falling bodies influences their speed. I obtain this via the application of concepts of parthood and of mereological sum, and via recognition of a principle which is not explicitly formulated by the Italian thinker but seems to be natural and helpful in understanding the logical mechanism behind Galileo’s train of thought. I also compare my reconstruction to one of those put forward by Atkinson and (...) Peijnenburg :115–136, 2004), and propose a formalization which is based on a principle introduced by them, which I shall call the speed is mediative principle. (shrink)

In this contribution I intend to reconstruct and evaluate one of Galileo's famous arguments given in the Discorsi against a well‐entrenched thesis of Aristotelian physics. It will be shown that Galileo's reduction‐to‐the‐absurd type of counterargument is, although seemingly cogent, after all fallacious. I ascribe Galileo's committing of this fallacy to his looking at the Aristotelian physics through the (Kuhnian type) paradigmatic “spectacles” of his own new physics.

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. (shrink)

Recent years saw the rise of an interest in the roles and significance of thought experiments in different areas of human thinking. Heisenberg's gamma ray microscope is no doubt one of the most famous examples of a thought experiment in physics. Nevertheless, this particular thought experiment has not received much detailed attention in the philosophical literature on thought experiments up to date, maybe because of its often claimed inadequacies. In this paper, I try to do (...) two things: to provide an interesting interpretation of the roles played by Heisenberg's gamma ray microscope in interpreting quantum mechanics – partly based on Thomas Kuhn’s views on the function of thought experiments – and to contribute to the ongoing discussions on the roles and significance of thought experiments in physics. (shrink)

Many well-known arguments in the philosophy of mind use thought experiments to elicit intuitions about consciousness. Often, these thought experiments include mechanistic explanations of a systems’ behavior. I argue that when we understand a system as a mechanism, we are not likely to understand it as an agent. According to Arico, Fiala, Goldberg, and Nichols’ (2011) AGENCY Model, understanding a system as an agent is necessary for generating the intuition that it is conscious. Thus, if we are presented (...) with a mechanistic description of a system, we will be very unlikely to understand that system as conscious. Many of the thought experiments in the philosophy of mind describe systems mechanistically. I argue that my account of consciousness attributions is preferable to the “Simplicity Intuition” account proposed by David Barnett (2008) because it is more explanatory and more consistent with our intuitions. Still, the same conclusion follows from Barnett’s “Simplicity” account and from my own account: we should reassess the conclusions that have been drawn from many famous thought experiments. (shrink)

In §69.b of BT Heidegger attempts an existential genetic analysis of science, i.e. a phenomenology of the conceptual process of the constitution of the logical view of science (science seen as theory) starting from the Dasein. It attempts to do so by examining the special intentional-existential modification of (human) being-in-the-world, which is called the "mathematical projection of nature"; that is, by examining that special modification of our being, which places us in the state of experience that presents the world to (...) us as taught by, e.g., Galileo and Newton. The idea he puts forward is that modern mathematical physics and the corresponding experience of the real is the result of the mathematical projection of nature. Modern science, Heidegger says, stands out because it is mathematical. But we cannot get the answer to what this mathematicality consists in from mathematics, because mathematics is only a special manifestation of mathematicality. Here is what Heidegger means by "mathematicality" and, accordingly by "mathematical projection of nature." If one were to let two bodies of different weights fall simultaneously from the top of the tower of Pisa, Heidegger notes, both Galileo and an Aristotelian would see that the two bodies would reach the ground with as little time difference as possible, and not at exactly the same moment. Galileo, however, does something decisive: he claims that under conditions that would be impossible to ensure (if we removed absolutely all resistance to the motion of the bodies), the two bodies would reach the ground absolutely simultaneously. This is not something that he or the Aristotelian sees happening empirically. How, then, does Galileo insist so firmly on his position? How exactly does it happen that he has before him such a view of things? Heidegger's answer is that Galileo is mathematically projecting nature. In his Dialogues Galileo says "I conceive with my mind" (mente concipio) a body thrown to move on an infinitely extending horizontal plane, having eliminated from its path every possible obstacle. Finally, I argue that from the detailed interpretation of Heidegger's points of the mathematical and of the notion of mathematical projection of nature, we can arrive at the conclusions I had arrived at in my doctoral dissertation (2000) as regards the meaning and function of thought experiments in physics as seen from a Husserlian phenomenological point of view as intentional acts. In a nutshell, in thought experiments physics constitutes the special metaphysics (to use the Kantian term) of the primordial ontological region it investigates as well as attempts to make natural sense of the mathematical formalism in cases it proves necessary. (shrink)

The history of the philosophy of thought experiments has touched on the work of Kuhn, Popper, Duhem, Mach, Lakatos, and other big names of the 20th century, but so far, almost nothing has been written about Paul Feyerabend. His most influential work was Against Method, 8 chapters of which concern a case study of Galileo with a specific focus on Galileo’s thought experiments. In addition, the later Feyerabend was very interested in what might be called the epistemology of (...) drama, including stories and myths. This paper brings these different aspects of Feyerabend’s work together in an attempt to present what might have been his considered views on scientific thought experiments. I conclude by contrasting Feyerabend’s ideas with two modern currents in the debate surrounding thought experiments: 1) the claim that the epistemology of thought experiments is just the epistemology of deductive or inductive arguments, and 2) the claim that the specifically narrative quality of thought experiments must be taken into account if we want a complete epistemology of thought experiments. (shrink)

Judith Jarvis Thomson famously argued that abortion is permissible even if we accept that a fetus qualifies as a person and possesses a right to life. The current paper presents two arguments that undermine Thomson’s position. First, the paper sketches a contractarian argument that explores Thomson’s violinist thought experiment from behind a veil of ignorance, which suggests that if we had an equal likelihood of being an unwanted fetus and a pregnant woman, it would be rational for us to (...) oppose abortion. Second, the paper discusses the hypothetical self-aborting fetus, a thought experiment that reverses the dependence relationship between a woman and a fetus. It is argued that in this scenario, where fetuses have agency of their own, Thomson’s position would counterintuitively prohibit a woman from temporarily curtailing the freedom of her fetus even to save her own life. (shrink)

The history of mechanics has been extensively investigated in a number of historical works. The full story from the Greeks and medievals through the Scientific Revolution to the modern era is long and complex. But it is also incomplete. Studies to date have been admirably thorough in putting empirical discoveries into proper perspective and in making clear the great importance of mathematical innovations. But there has been surprisingly little regard for the role of thought experiments in the development of (...) mechanics. We attempt to rectify this, at least in part. After a brief account of Greek ideas of space and motion, we focus on late medieval and early modern physics, especially the development of inertial motion. In particular, we examine the thought experiments of Buridan, Oresme, and Galileo, which did so much to undermine Aristotle’s account of motion and lead the way to the modern concept of inertia. (shrink)

: Although Galileo's struggle to mathematize the study of nature is well known and oft discussed, less discussed is the form this struggle takes in relation to Galileo's first new science, the science of the second day of the Discorsi. This essay argues that Galileo's first science ought to be understood as the science of matter—not, as it is usually understood, the science of the strength of materials. This understanding sheds light on the convoluted structure of (...) the Discorsi's first day. It suggests that the day's meandering discussions of the continuum, infinity, the vacuum, and condensation and rarefaction establish that a formal treatment of the "eternal and necessary" properties of matter is possible; i.e., that matter as such can be considered mathematically. This would have been a necessary, and indeed revolutionary, preliminary to the mathematical science of the second day because matter itself was thought in the Aristotelian tradition to be responsible for the departure of natural bodies from the unchanging and thus mathematizable character of abstract objects. In addition, the first day establishes that when considered physically, these properties account for matter's force of cohesion and resistance to fracture. This essay closes by showing that this dual style of reasoning accords with the conceptual structure of mixed mathematics. (shrink)

Thought experiments are fictional narratives that widen our cognitive horizons both in the sciences and in philosophy. In the present paper we argue that they can perform this function by bringing one’s perspective into view. Despite being traditionally conceived as devices that transmit true propositions to their readers, thought experiments are also particularly apt to express a specific theoretical perspective through the use of imagination. We suggest that this is a significant epistemic feature that is often overlooked in (...) the debate. After presenting our analysis of thought experiments (Section 2) and of the role that imagination plays in them (Section 3), we revisit Galileo Galilei’s use of imaginary cases in light of our account (Section 4). We show that the main aims of Galileo’s thought experiments are to highlight how different perspectives endorsed by fictional characters affect imagination and to invite readers to actively engage in perspectives that are different from their own. This results in a clash of perspectives which plays a crucial epistemic role (Section 5). Readers of thought experiments do not passively absorb information, but critically assess the other’s perspective. In the final part of the paper, we individuate different ways in which readers can react to thought experiments. (shrink)

Examples from Archimedes, Galileo, Newton, Einstein, and others suggest that fundamental laws of physics were—or, at least, could have been—discovered by experiments performed not in the physical world but only in the mind. Although problematic for a strict empiricist, the evolutionary emergence in humans of deeply internalized implicit knowledge of abstract principles of transformation and symmetry may have been crucial for humankind's step to rationality—including the discovery of universal principles of mathematics, physics, ethics, and an account of free will that (...) is compatible with determinism. (shrink)

The purpose of this study is to gain a better understanding of the role of abstraction and idealization in Galileo’s scientific inquiries into the law of free falling motion, and their importance in the history of science. Because there is no consensus on the use of the terms “abstraction” and “idealization” in the literature, it is necessary to distinguish between them at the outset. This paper will argue for the importance of abstraction and idealization in physics and the theories and (...) laws of physics constructed with abduction from observations and that these theoretical laws of physics should be tested with deduction and induction thorough quasi-idealized entities rather than empirical results in the everyday world. Galileo’s work is linked to thought experiments in natural science. Galileo, using thought experiments based on idealization, persuaded others that what had been proven true for a ball on an inclined plane would be equally true for a ball falling through a vacuum. (shrink)

Brown (The laboratory of the mind. Thought experiments in the natural science, 1991a , 1991b ; Contemporary debates in philosophy of science, 2004 ; Thought experiments, 2008 ) argues that thought experiments (TE) in science cannot be arguments and cannot even be represented by arguments. He rest his case on examples of TEs which proceed through a contradiction to reach a positive resolution (Brown calls such TEs “platonic”). This, supposedly, makes it impossible to represent them as arguments (...) for logical reasons: there is no logic that can adequately model such phenomena. (Brown further argues that this being the case, “platonic” TEs provide us with irreducible insight into the abstract realm of laws of nature). I argue against this approach by describing how “platonic” TEs can be modeled within the logical framework of adaptive proofs for prioritized consequence operations. To show how this mundane apparatus works, I use it to reconstruct one of the key examples used by Brown, Galileo’s TE involving falling bodies. (shrink)

ABSTRACTJohn Locke is famous for popularizing the method of the philosophical thought experiment in discussions of personal identity; the cases introduced in the second edition of An Essay Concerning Understanding are still employed by contemporary philosophers. Here I argue that Locke’s method is nonetheless importantly different from later efforts in ways that can help us better appreciate his larger projects. Rather than pumping the reader’s intuitions in support of his preferred account, Locke’s thought experiments serve to illustrate (...) common errors in assessments of identity that he sees as particularly prevalent and problematic. Locke defends his idea of ‘person’ otherwise, through what I call his ‘lived experiments’: observations about linguistic usage that serve to illustrate the term’s role in practical reasoning. I focus especially on Locke’s example of the forensic status of the madman. Examples like these do not, for Locke, demonstrate the intuitiveness of his analysis, but rather bolste... (shrink)

The role of intuition in understanding in general and in scientific understanding in particular is still very much a subject of a lively philosophical discussion. The role of intuition in thought experimenting is much disputed in its own right, and the arguments range from those that deny any substantial role of intuition in the final inference that the thought experiment is meant to illustrate (eg. Norton or Williamson) to the pivotal role some form of intuition might play (eg. (...) Brown or Miščević). So far, mostly Platonists were defenders of intuition, but in his recent book, Miščević takes on a formidable task to mount a defense of intuition as seen from a naturalist-evolutionist point of view and within his mental modelling approach to thought experiments. I will, while acclaiming certain – and considerable – merits of his approach, nevertheless, insist that certain aspects of intuitive comprehending as it is meant to be going on in the process of thought experimenting remains inexplicable in the naturalist scheme such as Miščević’s. The more mysterious (not to say Platonist) aspects of intuition will, hopefully, be revealed through the analyses of the two very famous thought experiments of Einstein which also figure quite importantly in his scientific opus. I will also have something to say about a few related problems as addressed by Miščević in his book regarding the description of thought experiment and more general imaginative enactments in thought, as well as on whether there is an essential difference between scientific (primarily physical) and metaphysical thought experiments and other thought experiments or related modes of thinking. (shrink)

The clearly recognized innovation in Galileo’s work on free fall has been a stimulus and a challenge for the history and philosophy of science. This article will analyze the experimental and theoretical aspects of Galileo’s work on free fall. It draws on several authors’ results to justify the claim that the research model established by Galileo remains valid today (Sections 2 and 3). The article draws this parallel with current science by focusing on Galileo’s method, way of considering scientific instruments, (...) and practice of confrontation between theory and experiments. The Galilean mode of investigation can be interpreted from a variety of possible philosophical perspectives: Section 3 examines how relevant the so-called constructivist and conventionalist perspectives are to analysis of Galileo’s innovations. Section 4 discusses Galileo’s contribution to the mathematization of science and the Platonic character of his thought. Finally, the article attempts to show that Galileo’s Platonism also involves experiments, as he conceives them. Keywords: Inclined Plane. Mathematics. Platonism. (shrink)

Several major breakthroughs in the history of physics have been prompted not by new empirical data but by thought experiments. James Robert Brown and John Norton have developed accounts of how thought experiments can yield such advances. Brown argues that knowledge gained via thought experiments demands a Platonic explanation; thought experiments for Brown are a window into the Platonic realm of the laws of nature. Norton argues that thought experiments are just cleverly disguised inductive or (...) deductive arguments, so no new account of their epistemology is needed. In this paper, I argue that although we do not need to invoke any Platonic insight to explain thought experimentation, Norton’s eliminativist account fails to capture the unique epistemological importance of thought experiments qua thought experiments. I then present my own account, according to which thought experiments are a particular type of inductive inference that is uniquely suited to generate new breakthroughs. (shrink)

This book offers a readable introduction to the main aspects of thought experimenting in philosophy and science. It presents the main options in understanding thought experiments, from empiricism to Platonism, and discusses their strengths and weaknesses. However, it also provides some original perspectives on the topic. Firstly, it provides a new definition and analysis of thought experimenting that brings it closer to laboratory experimenting. Secondly, it develops the author’s earlier theory of “mental modelling”, proposed some decades ago (...) by him, and some other researchers in the field as the crucial procedure in thought experimenting. The mental modelling approach links work with thought experimenting to cognitive science and to research on mental simulation which is a hot topic in present-day research. Thirdly, it proposes a principled way to respond to criticism of thought experimenting by “experimental philosophers” as they have been dominating the present-day debates. The response suggests a possible ameliorative, self-help project for thought experimenting. Finally, the book provides a way to systematize the history of important thought experiments in science and philosophy and thus connects, in an original way, the systematic investigation of experimenting to the historical work of famous thought experiments. It is of interest to scholars interested in history of ideas and philosophy of science. (shrink)

This paper is a warning that objections based on thought experiments can be misleading because they may elicit judgments that, unbeknownst to the judger, have been seriously skewed by psychological biases. The fact that most people choose not to plug in to the Experience Machine in Nozick’s (1974) famous thought experiment has long been used as a knock-down objection to hedonism because it is widely thought to show that real experiences are more important to us than (...) pleasurable experiences. This paper argues that the commonplace choice to remain in reality when offered a life in the Experience Machine is best explained by status quo bias – the irrational preference for things to remain the same. An alternative thought experiment, empirical evidence, and discussion of how psychological biases can affect our judgments are provided to support this argument. (shrink)

I provide some considerations on scientific thought experiments, focusing on their epistemic value. First, I outline the distinctive features of scientific thought experiments, provide some historical background and, as an illustration, describe two thought experiments: Galileo's on falling bodies and Stevin's on inclined plane. I take thought experiments in physics as an example from which more general conclusions can be drawn - about thought experiments in other natural sciences, but also in philosophy, mathematics, and (...) other sciences. Further, I present Kuhn's epistemic puzzle as well as some proposed solutions. This closely relates to the question what kind of processes are involved in scientific thought experimenting. The satisfactory answer must consider scientific discoveries. I outline the mental model account as the most promising account since it best incorporates the findings of cognitive science. I conclude with two issues that the account needs to resolve and the role cognitive science can play in this. (shrink)

In the ten years following the publication of Galileo Galilei's Discorsi e dimostrazioni matematiche intorno a due nuove scienze , the new science of motion was intensely debated in Italy, France and northern Europe. Although Galileo's theories were interpreted and reworked in a variety of ways, it is possible to identify some crucial issues on which the attention of natural philosophers converged, namely the possibility of complementing Galileo's theory of natural acceleration with a physical explanation of gravity; (...) the legitimacy of Galileo's methods of proof and of his theory of the composition of continuous magnitudes; and the adequacy of the experimental evidence in favor of his theory.Through his published works and his correspondence, Marin Mersenne contributed in a significant way to each of these discussions. In the following, I shall provide a sketch of Mersenne's multiple engagement with the new science of motion, while trying to account for his growing skepticism concerning Galileo's law of free fall. Whereas in the 1630s, Mersenne still firmly believed in the validity of this law and tried to devise experimental and mathematical proofs in its favor, in the 1640s he developed serious doubts regarding the possibility of constructing an exact science of motion. As we shall see, Mersenne's evolving attitude sheds an interesting light on his views concerning the relation between physics and mathematics.---------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ----------------------------------------------------. (shrink)

Scientists often make use of epistemic representations in order to perform investigations about the real world. So far, philosophers of science interested in epistemic representation of this sort have mostly focused on scientific models. In this thesis, I argue that there are other interesting instances of representation besides models: thought experiments, experimental organisms, and mechanically-produced pictures. These represent portions of the world in the same way as models do, if the concept of epistemic representation is properly understood. In Chapter (...) 1, I introduce and develop the idea that a system functions as an epistemic representation of a designated target system insofar as it is interpreted as a symbol that both possesses and highlights some properties that are then to be imputed to that target system via a proper de-idealising function. In the main body of the thesis, I analyse the above-mentioned types of representations and argue that they function as representations in the same way as scientific models. Chapter 2 discusses the use of thought experiments in physics, with particular focus on Galileo’s thought experiment that illustrates the principle of inertia. Chapter 3 focuses on experimental organism research in biology, with specific attention to the Drosophila melanogaster. Finally, Chapter 4 is about the epistemic use of mechanically produced pictures with the picture of a black hole as the primary case study. In each chapter, I further show that by studying these types of representation through the lens of the account developed in Chapter 1, one can (dis)solve specific issues about thought experiments, model organisms, and pictures respectively. In Chapter 5, I further defend my proposal from scepticism about the concept of representation and its application to these different cases. Chapter 6 concludes the thesis by illustrating the most general implications of my analysis and proposing routes for future enquiry. (shrink)

Philosophical discussions of Molyneux's problem within contemporary philosophy of mind tend to characterize the problem as primarily concerned with the role innately known principles, amodal spatial concepts, and rational cognitive faculties play in our perceptual lives. Indeed, for broadly similar reasons, rationalists have generally advocated an affirmative answer, while empiricists have generally advocated a negative one, to the question Molyneux posed after presenting his famous thought experiment. This historical characterization of the dialectic, however, somewhat obscures the role Molyneux's (...) problem has played in spawning debates within the empiricist tradition. Fortunately, the differences between various empiricist accounts have been widely recognized and discussed among historians of philosophy working on the topic. The focus of the present essay is to develop an interpretation of John Locke's views on Molyneux's problem that best coheres with his other views on human understanding as well as with the predominant scientific opinion about the nature of perception during the period in which he lived. (shrink)

Philosophers such as Gettier, Frankfurt, and Thomson are famous for their thought experiments. This makes one wonder: how did they invent their cases? Were they just lucky to devise a good case, or did they follow some basic rules that are available to all of us? In this paper, we argue for the latter answer by presenting a guidebook for analysing thought experiments. Our guidebook clearly specifies which factors should be included in a thought experiment, and (...) which factors should be left out. This will help students to see through the fantastical elements of TEs, to learn the practice, and to check whether philosophers are doing things right. We illustrate our account in some detail using examples from Thomson’s thought experiments. (shrink)

Thought experiments are one among the oldest and effectively employed tools of scientific reasoning. Hacking (Philos Sci 2:302–308, 1992) argues that thought experiments in contrast to real experiments do not have a life of their own. In this paper, I attempt to show that contrary to Hacking’s contentions, thought experiments do have a life of their own. The paper is divided into three main sections. In the first section, I review the reasons that Hacking sets out for (...) believing in the life of experiments. Second section discusses Hacking’s characterization of thought experiments. The section also reviews his arguments for denying a life to thought experiments. In the third section, I argue for a life of thought experiments. In this section, I discuss the historical evolution of the EPR thought experiment and Galileo’s Free Falling Bodies in detail to show the untenability of Hacking’s arguments. The third section is followed by a conclusion that thought experiments do have a life of their own. (shrink)

Albert Camus and Jean-Paul Sartre were the giants of 20th-century “existentialism”, although neither of them was comfortable with that title. Their famous differences aside, they shared a “phenomenological” sensibility and described personal experience in exquisite and excruciating detail and reflected on the meaning of this experience with both sensitivity and insight. That is the focus of this book: Camus and Sartre, their descriptions of personal experience, and their reflections on the meaning of this experience. They also reflected, worriedly, on (...) the nature of reflection. The thematic problem of the book is the relationship between experience and reflection. The book explores this relationship through novels and plays, Camus’ The Stranger, The Plague, and The Fall, Sartre’s Nausea and No Exit, and Sartre’s great philosophical tome, Being and Nothingness. (shrink)

In her already classical criticism of thought-experimenting, Kathy Wilkes points to superficialities in the most famous moral-political thought experiments, taking the Ring of Gyges as her central example. Her critics defend the Ring by discussing possible variations in the scenario(s) imagined. I propose here that the debate points to a significant dual structure of thought experiments. Their initial presentation(s) mobilize the immediate, cognitively not very impressive imaginative and refl ective efforts both of the proponent and the (...) listener of the proposal. The further debate, like the one exemplifi ed by Wilkes’s criticisms and some of the answers, appeals to a deeper, more rational variety of imagination and reasoning. I suggest that this duality is typical for moral and political thought experimenting in general, conjecture that it might be extended to the whole area of thought experimenting. (shrink)

Taking a cue from one of the most (in)famous postmodern thinkers, Friedrich Nietzsche, the essays in this book put forth “experiments” in thought rather than arguments for fixed conclusions. Blum brings John Howard Yoder to the same table with Nietzsche, Michel Foucault, and Jacques Derrida, and provides a provocative glimpse of what the resulting conversation might look like. As Anne Lamott and others have recently insisted, faith is not the opposite of doubt, but of certainty. Blum’s essays explore (...) some of our commonly held ways of talking about knowledge, meaning, commitment, and action. He suggests that some postmodern theoretical work, often dismissed or assumed to be anti-Christian, is well worth bringing into contemporary Anabaptist-Mennonite conversations about discipleship and corporate life. Part of the Polyglossia series, this book is intended for conversation among academics, ministers, and laypersons regarding knowledge, beliefs, and practices of the Christian faith. (shrink)

The central problem of the article is the paradox in the history of Newton’s mechanics: prominent researchers of the genesis of the Principia did not believe Newton’s words about the origin of the idea of universal gravity. They did not believe that he could have come up with this idea as early as 1666, considering circular orbits, and believed that Newton invented the story of the falling apple. The article proposes a “subjunctive” scenario leading to the law of universal gravity (...) and feasible at the level of Galileo’s knowledge and skills in 1611. The basis for such a scenario is the description of a thought experiment in Newton’s manuscript “The System of the World”, preceding the creation of Principia. The proposed reconstruction helps to consider and clarify the concept of “modern physics”, the birth of which was the main event of the Scientific Revolution of the XVI–XVII centuries. The traditional understanding reduces the essence of modern physics to a reliance on experience and on the language of mathematics. Such a definition, however, is not sufficient. The geometry of Euclid and the physics of Archimedes were mathematically perfect, and their axioms were based on objective experience. Despite the importance of the tools of mathematics and experiment, the key innovation of modern physics has become the belief in the hidden fundamental laws of the Universe and in the right of the researcher to invent invisible, “illogical”, “absurd” concepts and postulates, experimentally verifiable only together with the theory based on them. This postulate of fundamental cognitive optimism combines bold ingenuity with a humble need for empirical verification. (shrink)

In 1950, Alan Turing proposed his iconic imitation game, calling it a ‘test’, an ‘experiment’, and the ‘the only really satisfactory support’ for his view that machines can think. Following Turing’s rhetoric, the ‘Turing test’ has been widely received as a kind of crucial experiment to determine machine intelligence. In later sources, however, Turing showed a milder attitude towards what he called his ‘imitation tests’. In 1948, Turing referred to the persuasive power of ‘the actual production of machines’ rather than (...) that of a controlled experiment. Observing this, I propose to distinguish the logical structure from the rhetoric of Turing’s argument. I argue that Turing’s proposal of a crucial experiment may have been a concession to meet the standards of his interlocutors more than his own, while his construction of machine intelligence rather reveals a method of successive idealizations and exploratory experiments. I will draw a parallel with Galileo’s construction of idealized fall in a void and the historiographical controversies over the role of experiment in Galilean science. I suggest that Turing, like Galileo, relied on certain kinds of experiment, but also on rhetoric and propaganda to inspire further research that could lead to convincing scientific and technological progress. (shrink)