New methods of calculating indices from the dot-probe task measure temporal dynamics in attention bias or fluctuations in attention bias towards and away from emotional stimuli over time. H...

This dissertation is a critique of synthetic ethical naturalism (SEN). SEN is a view in metaethics that comprises three key theses: first, there are moral properties and facts that are independent of the beliefs and attitudes of moral appraisers (moral realism); second, moral properties and facts are identical to (or constituted only by) natural properties and facts (ethical naturalism); and third, sentences used to assert identity or constitution relations between moral and natural properties are expressions of synthetic, a posteriori necessities. (...) The last of these theses, which distinguishes SEN from other forms of ethical naturalism, is supported by a fourth: the semantic contents of the central moral predicates such as 'morally right' and 'morally good' are fixed in part by features external to the minds of speakers (moral semantic externalism). Chapter 1 introduces SEN and discusses the most common motivations for accepting it. The next three chapters discuss the influential "Moral Twin Earth" argument against moral semantic externalism. In Chapter 2, I defend this argument from the charge that the thought experiment upon which it depends is defective. In Chapters 3 and 4, I consider two attempts to amend SEN so as to render it immune to the Moral Twin Earth argument. I show that each of these proposed amendments amounts to an abandonment of SEN. Chapter Five explores Richard Boyd's proposal that moral goodness is a "homeostatic property cluster." If true, Boyd's hypothesis could be used to support several metaphysical, epistemological, and semantic claims made on behalf of SEN. I advance three arguments against this account of moral goodness. In the sixth chapter, I argue that moral facts are not needed in the best a posteriori explanations of our moral beliefs and moral sensibility. Because of this, those who accept a metaphysical naturalism ought to deny the existence of such facts or else accept skepticism about moral knowledge. In Chapter 7, I consider a counterargument on behalf of SEN to the effect that moral facts are needed in order to explain the predictive success of our best moral theories. I show that this argument fails. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Philosophy and Literature 27.1 (2003) 241-254 [Access article in PDF] Darwin and Political Theory Denis Dutton [Erratum]IN THE 1970s, during the oil crisis, B. F. Skinner suggested a way that the United States's energy shortage could be alleviated. People should be rewarded, he argued, for coming together to eat in large communal dining halls, rather than cooking and eating at home with their families. His reasoning was irresistible: (...) large cooking pots have a lower ratio of surface area to volume. There would be therefore a considerable saving in energy in massive public kitchens, compared with numberless small individual pots cooking in private kitchen stoves across the nation.Of course, Skinner must have known his idea would have to overcome objections based on ingrained middle-class prejudices. Some parents would feel aggrieved: placing children before big communal pots would rob mothers of the pleasures of preparing foods and feeding their own offspring. Others might object that the only foods adequate to a big, round energy-efficient vessels are stews or soups; they might complain about endless boiled fare. Families of one ethnic background or another might dislike the relatively uniform diet, despite the hearty, nutritious goodness of stew. I can imagine Skinner's frustration: Why are people so stubborn? Why can't they look beyond minor details and see the sheer reasonableness of the proposal?The story is cited by Steven Pinker in The Blank Slate as yet another dream of a better-engineered world shattered by the ornery persistence of human nature. Based on his work with rats and pigeons, Skinner was sure that the proper conditioning applied to human beings could eliminate aggression, overpopulation, pollution, and inequality. In Skinner's utopia, Pinker wisecracks, "The noble savage became the noble pigeon." [End Page 241]B. F. Skinner was just another daft step on a long utopian road that stretches back through Marx, Rousseau, Hobbes, and St. Thomas to Plato. These political philosophers, as well as those who, like Aristotle, are skeptical of utopianism, base their visions on some understanding, argued or merely implied, of human nature. All political systems—free or totalitarian, monarchist or republican—tend to posit some notion of the natural human being. In recent generations many thinkers have been inclined to regard competing conceptions of human nature as stuck in eternal conflict, embodying basic commitments about the human condition that are independent of evidence, originating instead in the religion, culture, or individual temperament of the political philosopher.Evolutionary psychology gives hope against this pessimism. Political philosophers are right to posit a natural background that underlies construction of political systems, evolutionary psychologists say, but it required Darwin finally to explain that background to us. A lucid attempt to spell out the implications evolution for politics has now been published by Paul H. Rubin, a professor of economics and law at Emory University, in the form of Darwinian Politics: The Evolutionary Origin of Freedom (Rutgers University Press, $25.00, paperback). Some of his conclusions are what anyone familiar with evolutionary psychology might suppose even without picking up the book. Others come as a surprise, and were unexpected even by Rubin himself. The book is both fascinating and unpredictable.The scene of evolution is the Environment of Evolutionary Adaptedness, the EEA, essentially the Pleistocene, the whole, long period lasting from 1.6 million years ago up until the shift to the Holocene with the invention of agriculture and large settlements 10,000 years ago. Our present intellectual constitution was achieved by about 50,000 years ago, or 40,000 before the Holocene. Keep in mind the immensity of this time scale: calculating at twenty years for a generation, there were 800,000 generations of humans and proto-humans in the Pleistocene, while there have been a mere 500 generations since agriculture and the first cities. It was in the earlier, much longer period that selective pressures created genetically modern humans. These pressures might have pushed only very slightly in one direction over another. But a slight pressure over hundreds of thousands of generations—toward a taste for sweet, say, or a wariness of snakes—... (shrink)

The problem of God's subordination to laws of logic and mathematics in jewish philosophy and theology.

本書為漢語世界第一部探討「自然」概念在中國文化史上流變的著作， 從概念史角度出發，探究「自然」概念的多重淵源與多元脈絡。 「自然」是當代漢語學術詞彙中語義極多源也極多元的重要概念。自《老子》提出「道法自然」以來，「自然」概念的流變始終與中國思想史的發展脈絡並行，而如同「道」、「太極」、「涅槃」一般，是極為重要的理論概念， 在中國文化史各領域亦扮演關鍵性的角色。 本書是漢語世界第一部從概念史的觀點出發，探討「自然」概念在中國文化史上流變的著作。全書由十二個單元組成，撰述的角度是對「自然」一詞的後設反省，內容跨越的年代由先秦直至20世紀，作者分別來自臺灣、香港、 美國的人文學者，議題新穎，觀點多元，一編在手，可大致瀏覽「自然」在中國文化史上的流變過程。.

In lieu of an abstract, here is a brief excerpt of the content:Managed Health Care: New Ethical Issues for All*Martina Darragh (bio) and Pat Milmoe McCarrick (bio)Changes in the way that health care is perceived, delivered, and financed have occurred rapidly in a relatively short time span. The 50-year period since World War II encompasses enormous growth in medical technology, soaring health care costs, and significant fragmentation of the two-party patient- physician relationship. This relationship first grew to include the third-party (...) payer, the health insurance industry, and now “with great speed and relatively little public awareness, a significant change has occurred in the way some decisions are made about a patient’s medical care” (III, Institute of Medicine 1989).The new means of providing health care bring an increasing number of parties into clinical decision-making processes. With this change, ethical issues that once concerned only health care professionals, the physician or the nurse, have expanded to include the patient and the groups who “manage” care—e.g., health maintenance organizations (HMOs), preferred provider organizations (PPOs), point of service groups (POSs), independent practice associations (IPAs), insurance reviewers, hospital administrators, institutional managers, and, the most recent players, purchasers of group health care who base their decisions on competitive pricing.The term “managed care” refers to a variety of continually adapting and developing arrangements that involve four groups. These groups, which have been labeled by the world of business, not health, are the “consumer” (once the patient), the “provider” (the physician and other health care professionals), the “insurer” (the reimburser for any care), and the “purchaser of care” or the primary buyer of health services (the large employer organization). Capitation is a common way to pay for health services in managed care systems. A certain dollar amount is negotiated for health services for a specified number of patients whether the care is delivered or not; the provider shares with the [End Page 189] insurer any financial risk for the actual cost of care (III, Centers for Disease Control 1995).When the Clinton administration’s health care reform movement failed to gain support in the U.S. Congress, the use of managed care to control rising health care costs accelerated. The literature on managed care and its effect on the patient-physician relationship reflects this shift. During the era of health care reform, “debate centered on how managed care could control costs, on the use of technology and patient satisfaction, [and] on access and barriers to care” (IV, Emanuel and Dubler 1995). When managed care organizations began contracting with physicians to provide health care services subject to the plans’ provisions, these plans became agents in clinical decision making on a wide-spread basis. HMO enrollment grew to 51 million persons by 1994 (III, Centers for Disease Control 1995). This “corporatization” of health care has sparked a plethora of articles about the effects of the marketplace on the physician’s ability to do what is best for the patient, and on the patient’s ability to trust the physician to do so.Many authors make it clear that managed care itself is not the problem, but rather the development of for-profit managed care plans by “corporate conglomerates with billions of dollars in assets that compensate their executives as grandly as basketball players” (V, Kassirer 1995) “in a marketplace that is largely unregulated” (I, Zoloth-Dorfman and Rubin 1995). “Some, mostly older plans that were created when cost containment was an unexpected benefit rather than their central purpose, deliver high-quality care economically. Unfortunately, others cut costs by recruiting the healthiest patients, excluding the sickest, rationing care by making it inconvenient to obtain, and denying care by a variety of mechanisms” (V, Kassirer 1995).These cost-containment features now play an intimate role in clinical practice. When a managed care plan contracts with a physician, the doctor becomes a “double agent” with contractual obligations to the plan to provide a preset amount of services and professional responsibilities to each patient to authorize necessary treatment (V, Angell 1993). This duality can undermine the physician’s fiduciary responsibility to the patient wherein the physician “has power over the affairs of [the patient]...and is required by law to act on that person’s... (shrink)

One of the most influential and radical French antislavery texts of the eighteenth century is the History of the Two Indies (Histoire des deux Indes). Guillaume-Thomas Raynal, or abbé Raynal (1713–1796), was the work’s official author, but large portions were composed by other people. The most explicit antislavery portions of the third edition (1780) were composed by Denis Diderot, who incorporated some of Jean-Joseph de Pechméja’s contributions to the first (1770) and second (1774) editions. Diderot (1713–1784) and Pechméja (1741–1785) (...) were White French writers. This chapter is an excerpt from a chapter of the 1780 edition titled “The Origins and Development of Slavery.” The text is astonishingly radical: it not only predicts that colonial slavery will end in a violent revolution but also endorses violence against enslavers. It also discusses and rebuts many common proslavery arguments before asking whether these arguments are even worth serious engagement. (shrink)

Denis Edwards was a theoloian concerned with the science and religion discourse and eco-theology. He died in March 2019. This book is a collection of his till now unpublished talks and essays.

Preregistration has been proposed as a useful method for making a publicly verifiable distinction between confirmatory hypothesis tests, which involve planned tests of ante hoc hypotheses, and exploratory hypothesis tests, which involve unplanned tests of post hoc hypotheses. This distinction is thought to be important because it has been proposed that confirmatory hypothesis tests provide more compelling results (less uncertain, less tentative, less open to bias) than exploratory hypothesis tests. In this article, we challenge this proposition and argue that there (...) are several advantages of exploratory hypothesis tests that can make their results more compelling than those of confirmatory hypothesis tests. We also consider some potential disadvantages of exploratory hypothesis tests and conclude that their advantages can outweigh the disadvantages. We conclude that exploratory hypothesis tests avoid researcher commitment and researcher prophecy biases, reduce the probability of data fraud, are more appropriate in the context of unplanned deviations, facilitate inference to the best explanation, and allow peer reviewers to make additional contributions at the data analysis stage. In contrast, confirmatory hypothesis tests may lead to an inappropriate level of confidence in research conclusions, less appropriate analyses in the context of unplanned deviations, and greater bias and errors in theoretical inferences. (shrink)

We use game theoretic models to take an in-depth look at the dynamics of discrimination and academic collaboration. We find that in collaboration networks, small minority groups may be more likely to end up being discriminated against while collaborating. We also find that discrimination can lead members of different social groups to mostly collaborate with in-group members, decreasing the effective diversity of the social network. Drawing on previous work, we discuss how decreases in the diversity of scientific collaborations might negatively (...) affect the progress of epistemic communities. (shrink)

Kerr coined the term ‘HARKing’ to refer to the practice of ‘hypothesizing after the results are known’. This questionable research practice has received increased attention in recent years because it is thought to have contributed to low replication rates in science. The present article discusses the concept of HARKing from a philosophical standpoint and then undertakes a critical review of Kerr’s twelve potential costs of HARKing. It is argued that these potential costs are either misconceived, misattributed to HARKing, lacking evidence, (...) or that they do not take into account pre- and post-publication peer review and public availability to research materials and data. It is concluded that it is premature to conclude that HARKing has led to low replication rates. (shrink)

Who should decide? In When Doctors Say No, philosopher and bioethicist Rubin examines this controversial issue.

First Published in 1970. Routledge is an imprint of Taylor & Francis, an informa company.

Scientists often adjust their significance threshold during null hypothesis significance testing in order to take into account multiple testing and multiple comparisons. This alpha adjustment has become particularly relevant in the context of the replication crisis in science. The present article considers the conditions in which this alpha adjustment is appropriate and the conditions in which it is inappropriate. A distinction is drawn between three types of multiple testing: disjunction testing, conjunction testing, and individual testing. It is argued that alpha (...) adjustment is only appropriate in the case of disjunction testing, in which at least one test result must be significant in order to reject the associated joint null hypothesis. Alpha adjustment is inappropriate in the case of conjunction testing, in which all relevant results must be significant in order to reject the joint null hypothesis. Alpha adjustment is also inappropriate in the case of individual testing, in which each individual result must be significant in order to reject each associated individual null hypothesis. The conditions under which each of these three types of multiple testing is warranted are examined. It is concluded that researchers should not automatically assume that alpha adjustment is necessary during multiple testing. Illustrations are provided in relation to joint studywise hypotheses and joint multiway ANOVAwise hypotheses. (shrink)

The replication crisis has caused researchers to distinguish between exact replications, which duplicate all aspects of a study that could potentially affect the results, and direct replications, which duplicate only those aspects of the study that are thought to be theoretically essential to reproduce the original effect. The replication crisis has also prompted researchers to think more carefully about the possibility of making Type I errors when rejecting null hypotheses. In this context, the present article considers the utility of two (...) types of Type I error probability: the Neyman–Pearson long run Type I error rate and the Fisherian sample-specific Type I error probability. It is argued that the Neyman–Pearson Type I error rate is inapplicable in social science because it refers to a long run of exact replications, and social science deals with irreversible units that make exact replications impossible. Instead, the Fisherian sample-specific Type I error probability is recommended as a more meaningful way to conceptualize false positive results in social science because it can be applied to each sample-specific decision about rejecting the same substantive null hypothesis in a series of direct replications. It is concluded that the replication crisis may be partly due to researchers’ unrealistic expectations about replicability based on their consideration of the Neyman–Pearson Type I error rate across a long run of exact replications. (shrink)

Several researchers have recently argued that p values lose their meaning in exploratory analyses due to an unknown inflation of the alpha level (e.g., Nosek & Lakens, 2014; Wagenmakers, 2016). For this argument to be tenable, the familywise error rate must be defined in relation to the number of hypotheses that are tested in the same study or article. Under this conceptualization, the familywise error rate is usually unknowable in exploratory analyses because it is usually unclear how many hypotheses have (...) been tested on a spontaneous basis and then omitted from the final research report. In the present article, I argue that it is inappropriate to conceptualize the familywise error rate in relation to the number of hypotheses that are tested. Instead, it is more appropriate to conceptualize familywise error in relation to the number of different tests that are conducted on the same null hypothesis in the same study. Under this conceptualization, alpha level adjustments in exploratory analyses are (a) less necessary and (b) objectively verifiable. As a result, p values do not lose their meaning in exploratory analyses. (shrink)

Hypothesizing after the results are known, or HARKing, occurs when researchers check their research results and then add or remove hypotheses on the basis of those results without acknowledging this process in their research report (Kerr, 1998). In the present article, I discuss three forms of HARKing: (1) using current results to construct post hoc hypotheses that are then reported as if they were a priori hypotheses; (2) retrieving hypotheses from a post hoc literature search and reporting them as a (...) priori hypotheses; and (3) failing to report a priori hypotheses that are unsupported by the current results. These three types of HARKing are often characterized as being bad for science and a potential cause of the current replication crisis. In the present article, I use insights from the philosophy of science to present a more nuanced view. Specifically, I identify the conditions under which each of these three types of HARKing is most and least likely to be bad for science. I conclude with a brief discussion about the ethics of each type of HARKing. (shrink)

The social identity of a researcher can affect their position in a community, as well as the uptake of their ideas. In many fields, members of underrepresented or minority groups are less likely to be cited, leading to citation gaps. Though this empirical phenomenon has been well-studied, empirical work generally does not provide insight into the causes of citation gaps. I will argue, using mathematical models, that citation gaps are likely due in part to the structure of academic communities. The (...) existence of these ‘structural causes’ has implications for attempts to lessen citation gaps, and for proposals to make academic communities more efficient. These proposals have the potential to create feedback loops, amplifying current structural inequities. (shrink)

This article explores the relationship between pragmatic encroachment and epistemic permissiveness. If the suggestion that all epistemic notions are interest-relative is viable , then it seems that a certain species of epistemic permissivism must be viable as well. For, if all epistemic notions are interest relative then, sometimes, parties in paradigmatic cases of shared evidence can be maximally rational in forming competing basic doxastic attitudes towards the same proposition. However, I argue that this total pragmatic encroachment is not tenable, and, (...) thus, epistemic permissivism cannot be vindicated in this way. (shrink)

Fisher criticised the Neyman-Pearson approach to hypothesis testing by arguing that it relies on the assumption of “repeated sampling from the same population.” The present article considers the responses to this criticism provided by Pearson and Neyman. Pearson interpreted alpha levels in relation to imaginary replications of the original test. This interpretation is appropriate when test users are sure that their replications will be equivalent to one another. However, by definition, scientific researchers do not possess sufficient knowledge about the relevant (...) and irrelevant aspects of their tests and populations to be sure that their replications will be equivalent to one another. Pearson also interpreted the alpha level as a personal rule that guides researchers’ behavior during hypothesis testing. However, this interpretation fails to acknowledge that the same researcher may use different alpha levels in different testing situations. Addressing this problem, Neyman proposed that the average alpha level adopted by a particular researcher can be viewed as an indicator of that researcher’s typical Type I error rate. Researchers’ average alpha levels may be informative from a metascientific perspective. However, they are not useful from a scientific perspective. Scientists are more concerned with the error rates of specific tests of specific hypotheses, rather than the error rates of their colleagues. It is concluded that neither Neyman nor Pearson adequately rebutted Fisher’s “repeated sampling” criticism. Fisher’s significance testing approach is briefly considered as an alternative to the Neyman-Pearson approach. (shrink)

Gelman and Loken (2013, 2014) proposed that when researchers base their statistical analyses on the idiosyncratic characteristics of a specific sample (e.g., a nonlinear transformation of a variable because it is skewed), they open up alternative analysis paths in potential replications of their study that are based on different samples (i.e., no transformation of the variable because it is not skewed). These alternative analysis paths count as additional (multiple) tests and, consequently, they increase the probability of making a Type I (...) error during hypothesis testing. The present article considers this forking paths problem and evaluates four potential solutions that might be used in psychology and other fields: (a) adjusting the prespecified alpha level, (b) preregistration, (c) sensitivity analyses, and (d) abandoning the Neyman-Pearson approach. It is concluded that although preregistration and sensitivity analyses are effective solutions to p-hacking, they are ineffective against result-neutral forking paths, such as those caused by transforming data. Conversely, although adjusting the alpha level cannot address p-hacking, it can be effective for result-neutral forking paths. Finally, abandoning the Neyman-Pearson approach represents a further solution to the forking paths problem. (shrink)

"Dr. Rubin has brought cognitive psychology into a wholly unprecedented dialogue with studies in oral tradition. The result is a truly new perspective on memory and the processes of oral tradition." --John Miles Foley, University of Missouri.

Despite sustained attention to ethical leadership in organizations, scholarship remains largely descriptive. This study employs an empirical approach to examine the consequences of ethical leadership on leader promotability. From a sample of ninety-six managers from two independent organizations, we found that ethical leaders were increasingly likely to be rated by their superior as exhibiting potential to reach senior leadership positions. However, leaders who displayed increased ethical leadership were no more likely to be viewed as promotable in the near-term compared to (...) those who displayed less ethical leadership. Our findings also show ethical culture and pressure to achieve results are important contextual factors that moderate the relationships between ethical leadership and leader promotability to senior leadership roles. (shrink)

This article analyzes the recent debate surrounding inclusive fitness and argues that certain limitations ascribed to it by critics—such as requiring weak selection or providing dynamically insufficient models—are better thought of as limitations of the methodological framework most often used with inclusive fitness. In support of this, I show how inclusive fitness can be used with the replicator dynamics. I conclude that much of the debate is best understood as being about the orthogonal issue of using abstract versus idealized models.

To provide the three-way comparisons needed to test existing theories, we compared (1) most-stressful memories to other memories and (2) involuntary to voluntary memories (3) in 75 community dwelling adults with and 42 without a current diagnosis of posttraumatic stress disorder (PTSD). Each rated their three most-stressful, three most-positive, seven most-important and 15 word-cued autobiographical memories, and completed tests of personality and mood. Involuntary memories were then recorded and rated as they occurred for 2 weeks. Standard mechanisms of cognition and (...) affect applied to extreme events accounted for the properties of stressful memories. Involuntary memories had greater emotional intensity than voluntary memories, but were not more frequently related to traumatic events. The emotional intensity, rehearsal, and centrality to the life story of both voluntary and involuntary memories, rather than incoherence of voluntary traumatic memories and enhanced availability of involuntary traumatic memories, were the properties of autobiographical memories associated with PTSD. (shrink)

Successful behavior requires actively acquiring and representing information about the environment and people, and manipulating and using those acquired representations flexibly to optimally act in and on the world. The frontal lobes have figured prominently in most accounts of flexible or goal-directed behavior, as evidenced by often-reported behavioral inflexibility in individuals with frontal lobe dysfunction. Here, we propose that the hippocampus also plays a critical role by forming and reconstructing relational memory representations that underlie flexible cognition and social behavior. There (...) is mounting evidence that damage to the hippocampus can produce inflexible and maladaptive behavior when such behavior places high demands on the generation, recombination, and flexible use of information. This is seen in abilities as diverse as memory, navigation, exploration, imagination, creativity, decision-making, character judgments, establishing and maintaining social bonds, empathy, social discourse, and language use. Thus, the hippocampus, together with its extensive interconnections with other neural systems, supports the flexible use of information in general. Further, we suggest that this understanding has important clinical implications. Hippocampal abnormalities can produce profound deficits in real-world situations, which typically place high demands on the flexible use of information, but are not always obvious on diagnostic tools tuned to frontal lobe function. This review documents the role of the hippocampus in supporting flexible representations and aims to expand our understanding of the dynamic networks that operate as we move through and create meaning of our world. (shrink)

Rubin examines the central role of the imagination in Santayana’s life and works. He shows how the imagination is fundamental to Santayana’s sceptical inquiry in SAF and a necessary condition for knowledge about the material world and the mind. The imagination is a predominant theme in Santayana’s life and work. Even as a boy, he found himself solitary and unhappy in America and “attached only to a persistent dream life.” He published several literary works, including three plays, a novel, (...) and many poems. In his philosophic work, he repeatedly insisted on the continuity between the imaginative nature of ordinary perception and the great accomplishments of the human imagination. Santayana’s idea that all perception consists of the intuition of non-existent essences means that for you to experience anything that exists you must imaginatively connect the data given to consciousness with things and events in the world. In Scepticism and Animal Faith, references to imagination appear throughout the book. Santayana argues that to truly understand something observations alone, even ones repeated many times from different angles, are not sufficient, because knowing how things actually are requires “sympathetic imagination.” Imagination leads to the most “complete and adequate” knowledge when the object is another mind. But knowledge of the material world is also a product of the imagination. Taking non-existent essences to signify existing things enables us to know what exists and what doesn’t. This knowledge frees the imagination to peruse the unbounded realm of essence without penalty. This freedom is possible because “poetic, creative, original fancy” is the primary form of sensibility. This freedom is necessary because for a living creature “his play-life is his true life.” This freedom makes possible the comprehensive visions of great art, literature, philosophic systems, and scientific theories. These works are continuous with everyday moments of experience, which are also fundamentally imaginative. Philosophy is successful when it enables us to creatively adjust to the world by probing our desires and finding each intuition a possible source of imaginative reflection. (shrink)

A number of philosophers defend naturalistic moral realism by appeal to an externalist semantics for moral predicates. The application of semantic externalism to moral predicates has been attacked by Terence Horgan and Mark Timmons in a series of papers that make use of their “ Moral Twin Earth ” thought experiment. In response, several defenders of naturalistic moral realism have claimed that the Moral Twin Earth thought experiment is misleading and yields distorted and inaccurate semantic intuitions. If they are right, (...) the intuitions generated by Moral Twin Earth cannot be appealed to in arguments against externalist moral semantics. The most developed case against the Moral Twin Earth argument that follows this strategy is found in a paper by Stephen Laurence, Eric Margolis and Angus Dawson. Here I argue that their attack on the Moral Twin Earth thought experiment fails. Laurence, Margolis and Dawson have not shown that we have reason to distrust the semantic intuitions it generates. (shrink)