In this article, we compare the expressive powers of classes of normal logic programs that are obtained by constraining the number of positive subgoals in the bodies of rules. The comparison is based on the existence/nonexistence of polynomial, faithful, and modular translation functions between the classes. As a result, we obtain a strict ordering among the classes under consideration. Binary programs are shown to be as expressive as unconstrained programs but strictly more expressive than unary programs which, in turn, are (...) strictly more expressive than atomic programs. We also take propositional theories into consideration and prove them to be strictly less expressive than atomic programs. In spite of the gap in expressiveness, we develop a faithful but non-modular translation function from normal programs to propositional theories. We consider this as a breakthrough due to sub-quadratic time complexity |). Furthermore, we present a prototype implementation of the translation function and demonstrate its promising performance with SAT solvers using three benchmark problems. (shrink)

According to Partial Aggregation, a serious harm can be outweighed by a large number of somewhat less serious harms, but can outweigh any number of trivial harms. In this paper, I address the question of how we should extend Partial Aggregation to cases of risk, and especially to cases involving small risks of serious harms. I argue that, contrary to the most popular versions of the ex ante and ex post views, we should sometimes prevent a small risk that a (...) large number of people will suffer serious harms rather than prevent a small number of people from certainly suffering the same harms. Along the way, I object to the ex ante view on the grounds that it gives an implausible degree of priority to preventing identified over statistical harms, and to the ex post view on the grounds that it fails to respect the separateness of persons. An insight about the nature of claims emerges from these arguments: there are three conceptually distinct senses in which a person’s claim can be said to have a certain degree of strength. I make use of the distinction between these three senses in which a claim can be said to have strength in order to set out a new, more plausible, view about the aggregation of people’s claims under risk. (shrink)

François Recanati describes a metarepresentation as a representation of linguistic and mental representations. Two levels of content are involved, that of a metarepresentation dS, and that of the object representation S. According to Recanati’s “iconicity thesis,” dS contains S semantically as well as syntactically, so that one cannot entertain dS without also entertaining S. Iconicity “suggests” the doctrine of semantic innocence, whereby an embedded object-representation has the same content it would have when uttered in isolation—its “normal” semantic value—and one of (...) Recanati’s principal aims is to show how the opacity of oratio obliqua and oratio recta constructions can be explained without sacrificing innocence. His treatment is set firmly within the framework of Kaplan 1989 and is inspired by the account of quotation in Davidson 1968. Though devoid of technical and metaphysical encumbrance, his book is not a lean display of a single vision, since Recanati spends considerable time on proposals that he ends up rejecting or modifying. Some readers might become impatient with the detailed comparisons, but the dedicated student will welcome the learned discussion of alternatives. In all, Recanati has given us an excellent study of metarepresentation, enlivened by state-of-the-art pragmatics and at the forefront of the latest discourse on attitudinal ascriptions. (shrink)

By deliberation we understand practical reasoning with an end in view of choosing some course of action. Integral to it is the agent's sense of alternative possibilities, that is, of two or more courses of action he presumes are open for him to undertake or not. Such acts may not actually be open in the sense that the deliberator would do them were he to so intend, but it is evident that he assumes each to be so. One deliberates only (...) by taking it for granted that both performing and refraining from any of the acts under consideration are possible for one, and that which is to be selected is something entirely up to oneself. What is it for a course of action to be presumed as open, or for several courses of action to present themselves as a range of open alternatives? Answering these questions is essential for an understanding of deliberation and choice and, indeed, for the entire issue of free will and responsibility. According to one common view, a deliberator takes the considered options to be open only by assuming he is free to undertake any of them and, consequently, that whichever he does undertake is, as yet, a wholly undetermined matter. Built into the structure of deliberation, on this theory, is an indeterministic bias relative to which any deliberator with deterministic beliefs is either inconsistent or condemned to a fatalistic limbo. An unmistakable challenge is thereby posed: is there an alternative conception of the presuppositions underlying deliberation more congenial to a deterministic perspective yet adequate to the data? Convinced that there is, I develop a partial account of deliberation that, though highly similar to the aforementioned view, diverges at a critical juncture. (shrink)

The past 25 years have witnessed a vigorous discussion of an argument directed against the compatibilist approach to free will and responsibility. This reasoning, variously called the “consequence argument,” the “incompatibility argument,” and the “unavoidability argument,” may be expressed informally as follows: If determinism is true then whatever happens is a consequence of past events and laws over which we have no control and which we are unable to prevent. But whatever is a consequence of what’s beyond our control is (...) not itself under our control. Therefore, if determinism is true then nothing that happens is under our control, including our own actions and thoughts. Instead, everything we do and think, everything that happens to us and within us, is akin to the vibration of a piano string upon being struck, with the past as pianist, and could not be otherwise than it is. While a number of philosophers take this reasoning to crush the prospects of compatibilism, others challenge its assumption that unavoidability “transfers” from sufficient condition to necessary condition or from cause to effect. The ensuing debate has occasionally been vitriolic— Hume once remarked that the free will issue is “the most contentious question of metaphysics, the most contentious science”—yet undeniably fruitful in generating more detailed examinations of ability and practical freedom. Whether we incline towards compatibilism or 2 incompatibilism, this latter development is likely to be of lasting value. As a compatibilist, I believe that the consequence argument fails to prove incompatibilism, and here I will develop criticisms of it that, for the most part, are already in the existing literature. Although a short essay cannot provide the theoretical account of practical freedom needed to underpin and justify this compatibilist critique, it will clarify the tasks that lie ahead. (shrink)

Essential to Peirce's distinction among three kinds of reasoning, deduction, induction and abduction, is the claim that each is correlated to a unique species of validity irreducible to that of the others. In particular, abductive validity cannot be analyzed in either deductive or inductive terms, a consequence of considerable importance for the logical and epistemological scrutiny of scientific methods. But when the full structure of abductive argumentation — as viewed by the mature Peirce — is clarified, every inferential step in (...) the process can be seen to dissolve into familiar forms of deductive and inductive reasoning. Specifically, the final stage is a special type of practical inference which, if correct, is deductively valid, while the creative phase, surprisingly, is not inferential at all. In neither is abduction a type of inference to the best explanation. The result is a major reassessment of the relevance of Peirce's views to contemporary methodological studies. (shrink)

In “An Intrapersonal Addition Paradox,” Jacob Nebel provides a novel intrapersonal argument for the Repugnant Conclusion. The most controversial premise of Nebel’s argument is the “Probable Addition Principle,” on which it is better for individuals to receive additional chances of existence with a life worth living. I provide an alternative intrapersonal argument for the Repugnant Conclusion which does not assume the Probable Addition Principle. I also show that Pareto principles alone, when conjoined with very minimal principles of prudence, imply a (...) version of the Repugnant Conclusion. (shrink)

In God Emperor of Dune, Leto II explains to Moneo why people destroyed thinking machines in the Butlerian Jihad: "Humans had set those machines to usurp our sense of beauty, our necessary selfdom out of which we make living judgments." The Orange Catholic Bible (OCB), the key religious text in the Dune universe, forbids the creation of machines that imitate human thinking: "Thou shalt not make a machine in the likeness of a man's mind." The OCB focuses on human mental (...) abilities – especially computation, reason, and logic – that have a status that machines should not emulate. In Frank Herbert's universe, divine imitation and creation are presented in conflicting ways: on the one hand, they are strictly prohibited, on the other, they are aspirations for key characters. Mentats replace machines by use of hard, cold, logical thinking and reasoning with machine‐like efficiency. (shrink)

Autonomous systems are machines that can alter their behavior without direct human oversight or control. How ought we to program them to behave? A plausible starting point is given by the Reduction to Acts Thesis, according to which we ought to program autonomous systems to do whatever a human agent ought to do in the same circumstances. Although the Reduction to Acts Thesis is initially appealing, we argue that it is false: it is sometimes permissible to program a machine to (...) do something that it would be wrong for a human to do. We advance two main arguments for this claim. First, the way an autonomous system will behave can be known in advance. This knowledge can indirectly affect the behavior of other agents, while the same may not be true at the time the system actually executes its programming. Second, a lack of knowledge of the identities of the victims and beneficiaries can provide a justification during the programming phase that would be unavailable to an agent at the time the autonomous system executes its programming. (shrink)

According to the Welfare Diffusion Objection, we should reject Prioritarianism because it implies the ‘desirability of welfare diffusion’: the claim that it can be better for there to be less total wellbeing spread thinly between a larger total number of people, rather than for there to be more total wellbeing, spread more generously between a smaller total number of people. I argue that while Prioritarianism does not directly imply the desirability of welfare diffusion, Prioritarians are nevertheless implicitly committed to certain (...) principles for comparing different-number populations which, together with the Prioritarian same-person axiology, imply the desirability of welfare diffusion. (shrink)

As practical beings, we act with a sense of freedom, or, to use Kant’s memorable phrase, “unter der Idee der Freiheit.” This attitude is present whenever we are deciding what to do, and it is most clearly revealed when we reflect on what we take for granted while deliberating. Consider a young man, Imad, who lives under an oppressive military occupation and deliberates about whether to join the resistance, leave the country, or continue quietly in his studies hoping that the (...) occupation will be eliminated through the efforts of others. Taking any of these alternatives is likely to have momentous consequences upon his physical safety, his self-esteem, and realization of his goals. Yet, he can no longer tolerate his indecision and feels that he must commit himself somehow. One thing is apparent; Imad faces alternative courses of action, each of which he regards as open for him to undertake at the time. Were he to come to believe of any of the alternatives that it is no longer a genuine option, he would cease deliberating about whether to take it. An agent’s “sense” or “awareness” of personal freedom is nothing more than a presumption of open alternatives made explicit in reflection. But what exactly is its content? What does one accept in presuming a course of action to be “open”? To fix.. (shrink)

According to Hector-Neri Castañeda, indexical reference is our most basic means of identifying the objects and events we experience and think about. Its tokens reveal our own part in the process by denoting what are "referred to as items present in experience" (Castañeda 1981, 285-6). If you hear me say, "Take that box over there and set it next to this box here," you learn something about my orientation towards the referents in a way that is not conveyed by, "Take (...) the red box and set it next to the blue box." My indexical tokens express what they do not only because they issue from a unique spatio-temporal perspective that I happen to occupy, but also because they reflect my encounter with referents that are differently situated in that perspective. From your perspective, my here might be your there, my you your she, and within my own, a this differs from a that and one this diverges from another. Encounter and orientation within a perspective are the essential ingredients in indexical identification without which particular 'this's, 'that's, 'then's, 'here's, and 'beyond's would be denuded of individuating powess.1 There are several consequences of this description. First, indexical reference is ephemeral because perspective is constantly changing, rendering the indexical status of an entity relative to a given perspective temporary: 1 A this quickly turns into a that, and soon enough it is lost to experience and is not even a remote that; a you goes away and is replaced by another . . . Nothing is really an enduring you -- except God perhaps for the abiding mystic. (Castañeda 1989a, 69) Second, indexical reference is irreducible since non-indexical mechanisms of reference fail to express the subject's involvement or encounter with the referents that indexicals convey. Nor can the various indexicals be reduced to each other.2 Third, because each perspective is unique, indexical reference is essentially subjective.. (shrink)

It is widely agreed that the references of indexical expressions are fixed partly by their relations to contextual parameters such as the author, time, and place of the utterance. Because of this, indexicals are sometimes described as token-reflexive or utterance-reflexive in their semantics. But when we inquire into how indexicals help us to identify items within experience, we find that while utterance-reflexivity is essential to an interpretation of indexical tokens, it is not a factor in a speaker's identificatory use of (...) indexicals. Tokens cannot be interpreted unless they are first produced, and obviously the speaker who produces them does not depend upon utterance parameters in order to identify their referents in the way that hearers do. Consequently, the standard reflexive accounts of indexicals are of little use in explaining the speaker's identificatory use of indexicals, and must be either replaced or complemented by a further theory of the role of indexicals in thought. This paper provides an account of indexical identification that is attentive to a speaker's as well as a hearer's identification and reveals how indexicals are inextricably perspectival. (shrink)

I argue for the principle of Anonymity, according to which two populations are equally good whenever they have the same anonymous distribution of wellbeing. I first show that, given transitivity of the at-least-as-good-as relation, Anonymity is entailed by the ``Non-Identity Principle'', according to which the consequence of bringing better rather than worse lives into existence is, all else equal, better. I then argue for the Non-Identity Principle on the basis that if it were false, it would follow that we fail (...) to improve the world when we make existing people better off, while at the same time replacing worse-off future people with different better-off future people. Since this is implausible, we should accept the Non-Identity Principle, and therefore Anonymity as well. (shrink)

Discussions of free will have frequently centered on principles concerning ability, control, unavoidability and other practical modalities. Some assert the closure of the latter over various propositional operations and relations, for example, that the consequences of what is beyond one's control are themselves beyond one's control.1 This principle has been featured in the unavoidability argument for incompatibilism: if everything we do is determined by factors which are not under our control, then, by the principle, we are unable to act and (...) choose other than we actually did. A second family of principles concerns the fixity of the past and the laws of nature. If no one is able to alter the past or violate the laws it seems but a small step to conclude that no one can do anything such that if they did it then the past would be altered or the laws violated. Accordingly, if an agent's performing an act is necessitated by the past and laws, then the agent is unable to refrain from that act at that time. Generalizing, determinism precludes anyone from doing anything other than what he or she did.2. (shrink)

In 'You and She*' (ANALYSIS 51.3, June 1991) C.J.F. Williams notes the importance of reflexive pronouns in attributions of propositional attitudes, and claims to improve upon an earlier account of Hector-Neri Castaneda's in [1]. However, to the extent which his remarks are accurate, they reveal nothing that Castaneda hasn't already said, while insofar as they are new, they obliterate distinctions vital to Castaneda's theory. Castaneda called these pronouns quasi-indicators and noted that they function as linguistic devices used for attributing indexical (...) reference to others. For example, in hearing Arthur say 'I am wise' we would report his claim in English with, (1) Arthur thinks that he himself is wise. where 'he himself' is a quasi-indicator used to attribute to Arthur reference to himself qua self -- an expression that Castaneda abbreviated with 'he*.' Note that (1) is quite different from, (2) Arthur thinks that I am wise for 'I', functioning here as an indexical term, represents only the speaker's reference. Nor can (1) be identified with, (3) Arthur thinks that Arthur is wise. for this fails to represent the indexical character of Arthur's thought. Thus, (3) falls short of the informational content of (1). Moreover, as Williams, echoing Castaneda, points out, Arthur might not know that he himself is Arthur, or that he is named 'Arthur.' Hence, (3) might be false even if (1) is true. Williams observes that 'she' can also be used in oratio obliqua to report an indexical 1 usage, e.g., in (4) Arthur told Mary that she ought to talk to Shirley Makepeace's.. (shrink)

According to C. S. Peirce, abduction is a rational attempt to locate an explanation for a puzzling phenomenon, where this is a process that includes both generating explanatory hypotheses and selecting certain hypotheses for further scrutiny. Since inference is a controlled process that can be subjected to normative standards, essential to his view of abductive rasoning is that it is correlated to a unique species of correctness that cannot be reduced to deductive validity or inductive strength. This irreducibility claim is (...) of considerable importance for the logical and epistemological scrutiny of scientific methods, but it is not clear that Peirce produced a convicing argument for it. To the contrary, when the full structure of abductive argumentation is clarified, especially as presented in Peirce’s later writings on the topic, a good case can be made for viewing every inferential step in the abductive process as dissolving into familiar forms of deductive and inductive reasoning. Specifically, hypothesis-selection is a special type of practical inference that, if correct, is deductively valid, while the creative phase, hypothesis-generation, is not inferential at all. Once this is understood, it emerges that the familiar descriptions of abduction as “inference to the best explanation” or as a process of “belief revision” are, at best, misleading. (shrink)

Self-awareness is commonly expressed by means of indexical expressions, primarily, first- person pronouns like.

Disputes over territory are among the most contentious in human affairs. Throughout the world, societies view control over land and resources as necessary to ensure their survival and to further their particular life-style, and the very passion with which claims over a region are asserted and defended suggests that difficult normative issues lurk nearby. Questions about rights to territory vary. It is one thing to ask who owns a particular parcel of land, another who has the right to reside within (...) its boundaries and yet another to determine which individuals or groups have political rights of citizenship, sovereignty, and self-determination within it. It must also be asked how these rights—if ‘rights’ is the correct term—are acquired. When attention turns to the territorial rights of communities, national groups or states, sovereignty is the principal concern. Within international law, de facto power over a territory, say, of occupying forces or trustees, is insufficient to possess or acquire sovereignty (Brownlie, 1990, p. 111). The central conceptions underlying modern democratic thought are that sovereignty over a politically demarcated territory is vested in the resident population, and that governmental authority is derived from the consent of that population. It is simple enough to identify the latter with the citizenry of a state, but demographic and political flux makes this a loose criterion. States come and go, and sometimes a territory is stateless. Also, large-scale demographic shifts during upheavals and peacetime immigrations change the assessments of who belongs where. Does everyone residing in a place at a particular time have a right to share in its governance then? What about illegal immigrants? Presumably, sovereignty rests with the established population or.. (shrink)

Corporations today have been engineered by CEOs and other business advocates to look increasingly green and responsible. However, alarming cases such as Enron, Parmalat and Worldcom bear witness that a belief in corporate goodness is still nothing other than naïve. Although many scholars seemingly recognize this, they still avoid touching on the most sensitive and problematic issues, the taboos. As a consequence, discussion of important though problematic topics is often stifled. The article identifies three ‘grand’ taboos of CSR discourse and (...) explicitly raises them for discussion. They are the taboos of amoral business, continuous economic growth, and the political nature of CSR. It is suggested that CSR can only be as advanced as its taboos. The critical potential of the field remains underdeveloped as a consequence of the taboos, and in many cases the CSR discourse merely produces alluring but empty rhetoric about sustainability and responsible business. (shrink)

Tarkastelemme tässä artikkelissa, kuinka ihmisen psykologinen taipumus olemusajatteluun eli niin kutsuttu psykologinen essentialismi voisi näkyä argumentaatiossa. Esittelemme ensin psykologista tutkimusta aiheesta, minkä jälkeen tarkastelemme ilmiön merkitystä argumentaation ja sen tutkimuksen kannalta. Olemusajattelu näkyy julkilausumattomina taustaoletuksina, jotka kuitenkin vaikuttavat ihmisten tapaan tehdä päätelmiä ja rakentaa argumentteja. Argumentaation yhteydessä olemusajattelua tulee tarkastella taipumuksena tietynlaisiin piilopremisseihin. Lopuksi pohdimme, mitä merkitystä tällä voisi olla filosofian näkökulmasta.

Deflationary theories of truth had two different types of responses to the Liar. A first class of deflationists considers that this paradox does not represent a problem for their theories. On the other hand, other deflationists find the Liar to be a serious issue. This article focuses on the first class. Both Grover and Gupta consider that the Liar does not represent a problem for a deflationary theory of truth. For Grover, the paradox is demolished through the construction of the (...) theory and for Gupta, the Liar is not the problem of the deflationist, but rather it concerns a specialist. Dorothy Grover (2005) is an advocate of the prosentential theory of truth. This theory considers that truth works as a prosentence. The sentence resulted by adding the truth predicate to a referring expression has the same content as the sentence picked out by the initial referring expression. A prosentence does not have a meaning by itself; it takes its meaning from its antecedent. Grover considers that the truth predicate used in the Liar fails to pick up an antecedent, thus it does not have operative meaning. The operative meaning comes from using a word in a specific context. Gupta (2005) considers that a specialist – not a deflationist – should give the proper answers to the paradoxes. A deflationist should not be concerned with how the paradoxes can be avoided. His only interest is how the T-schema should be interpreted in order to give the meaning of the truth predicate and how the deflationary conclusions are reached. Paradoxes do not count in as an issue for deflationists, because they are able to answer to their main questions without facing paradoxes. Therefore, the Liar is not a real issue for the deflationist. The main aim of this article is to offer some counterarguments for these two views. Grover’s difference between dictionary and operative meaning seems to make a distinction between accepted and restricted sentences. This distinction is needed in order to escape the problem of paradoxes. If this is the case, the Liar is an issue, but it is solvable. This is quite different from what Grover claims. On the other hand, Gupta’s approach may ease the deflationist’s work but it might destroy his theory. (shrink)

From "word-images' to "chapter-shots: The irnagiuist montage of Anatolij Mariengof. The article discusses the three dominant imaginist principles of Anatolij Mariengofs poetic technique, as they are translated into prose in his first fictional novel Cynics. These principles include the "catalogue of images", a genre introduced by Vadim Shershenevich, i.e. poetry formed of nouns, which Mariengof makes use of in his longer imaginist poems. Another dominant imaginist principle, to which Mariengof referred in his theoretic articles and poetic texts, is similar to (...) the creating of shocking images typical of Russian futurism. Mariengofs application is the juxtaposition of "pure" and "impure", either a conflict between the vehicle and the object within a metaphor or a conflict between metaphors. This is an essential poetic feature in both Mariengofs poetry and prose. The third, maybe the most Mariengofian imaginist principle, relevant to the study of Cynics, is the poetics of transition, i.e. a certain fragmented structure of the text, which is related to Mariengors use of heteroaccentual rhyme. All these principles can be treated as fundamental elements in Mariengofs use of montage technique in his fictional prose. (shrink)

Includes bibliographical references (p. 619-646) and index.

En la parte I de Self-Knowing Agents, Lucy O�Brien expone una teoría de la referencia de primera persona. En lo que sigue describo su teoría y luego planteo dudas en torno a sus logros. Como no estoy seguro de haberla entendido correctamente, tal vez esté yo erigiendo y atacando un muñeco de paja; en todo caso, lo único que espero es que lo que se dice aquí sobre la primera persona sea de interés por sí mismo.

John Searle describes our sense of freedom as an experience of a “gap” between an intentional action and its psychological antecedents, specifically, our reasons.. Since the gap is itself understood as a lack of causation, then no agent can accept the antecedent determination of voluntary action except at the price of “practical inconsistency.” I argue that despite Searle’s insightful discussion, the sense of freedom is not an experience of a gap as he describes it but, instead, is a higher-order attitude (...) concerning one’s limited grasp of causes. As a result, a determinist can engage in voluntary action without falling into inconsistency. (shrink)

Understanding the effect of stress, fatigue, and sleep deprivation on the ability to maintain an alert and attentive state in an ecologically valid setting is of importance as lapsing attention can, in many safety-critical professions, have devastating consequences. Here we studied the effect of close-quarters battle exercise combined with overnight military training with sleep deprivation on cognitive performance, namely sustained attention and response inhibition. In addition, the effect of the CQ battle and overnight training on cardiac activity [heart rate and (...) root mean square of the successive differences ] during the cognitive testing and the relationship between cardiac activity and cognitive performance were examined. Cognitive performance was measured with the psychomotor vigilance task and the sustained attention to response task. Altogether 45 conscripts participated in the study. The conscripts were divided into control and experimental groups. The CON completed the training day after a night of sleep and the EXP after the overnight military training with no sleep. Results showed that the effect of the overnight training on cognitive performance and the between-group difference in heart rate and heart rate variability depended on the cognitive test. Surprisingly, the cognitive performance was not largely affected by the CQ battle. However, as expected, the CQ battle resulted in a significant decrease in RMSSD and an increase in HR measured during the cognitive testing. Similarly, the HR parameters were related to cognitive performance, but the relationship was found only with the PVT. In conclusion, fatigue due to the overnight training impaired the ability to maintain sufficient alertness level. However, this impairment in arousal upregulation was counteracted by the arousing nature of the SART. Hence, the conscripts' cognitive performance was mainly preserved when performing a stimulating task, despite the fatigue from the sleep loss of the preceding night and physical activity. (shrink)

Philip E. Devine has presented insightful proposals for defining religion in his essay “On the Definition of Religion” (Faith and Philosophy, July 1986). But despite his illuminating discussion, particularly the treatment of borderline cases, his account fails to distinguish religion as a process or goal-oriented activity from religion as a body of doctrine, and is mistaken (or perhaps unclear) in its proposal that religion per se is committed to the existence of superhuman agents. These deficiencies are exposed herein, and a (...) sketch of an alternative view of religion, inspired by the views of both William James and Josiah Royce, is set forth. (shrink)

In recent years, compatibilism has been the target of two powerful challenges. According to the consequence argument, if everything we do and think is a consequence of factors beyond our control (past events and the laws of nature), and the consequences of what is beyond our control are themselves beyond our control, then no one has control over what they do or think and no one is responsible for anything. Hence, determinism rules out responsibility. A different challenge--here called the manipulation (...) argument--is that by allowing agents to be fully determined compatibilist accounts of practical freedom and responsibility are unable to preclude those who are subject to global manipulation from being free and responsible. (shrink)

: Frege’s remarks about the first-person pronoun in Der Gedanke have elicited numerous commentaries, but his insight has not been fully appreciated or developed. Commentators have overlooked Frege’s reasons for claiming that there are two distinct first-person senses, and failed to realize that his remarks easily generalize to all indexicals. I present a perspectival theory of indexicals inspired by Frege’s claim that all indexical types have a dual meaning which, in turn, leads to a duality of senses expressed by indexical (...) tokens. Keywords : Indexicals; First Person; Perspective; Senses La doppia natura degli indessicali: una posizione fregeana Riassunto : Le osservazioni di Frege sul pronome di prima persona contenute in Der Gedanke hanno sollevato numerosi commenti, ma le sue intuizioni non sono state pienamente comprese o sviluppate. I commentatori di Frege hanno trascurato le ragioni per le quali egli sosteneva che ci sono due distinti sensi della prima persona e non hanno colto come queste sue osservazioni possono essere facilmente estese a tutti gli indessicali. Intendo presentare qui una posizione prospettivista sugli indessicali, ispirata dall’affermazione di Frege per cui tutti i tipi di indessicali hanno un doppio significato che, a sua volta, porta a una doppia natura dei sensi espressi dalle occorrenze indessicali. Parole chiave : Indessicali; Prima persona; Prospettiva; Sensi. (shrink)