Fictional ersatz realism is the metaphysical stance that abstract fictional entities exist and are dependent on fiction and literary practices. Everett tackled the position of ersatz realism by claiming that the ersatz realist cannot provide an identity criterion for fictional entities that does not imply a contradiction. Although Woodward proposed a defense to Everett's argument, I will argue that ersatz realism is no tenable position, as it still cannot provide an adequate identity criterion. To establish this (...) result, I will provide a base frame for identity criteria available to the ersatz realist. Afterwards, I will show that to any identity criterion the ersatz realist may propose there is a story such that a fictional entity corresponding to this story is not self-identical, imposing a contradiction to the metaphysical account of ersatz realism. (shrink)

I propose formulating identity criteria as generic statements of ground, thereby avoiding objections that have been made to the more usual formulations.

Identity criteria are powerful tools for the metaphysician. They tell us when items are identical or distinct. Some varieties of identity criteria also try to explain in virtue of what items are identical or distinct. This Element has two objectives: to discuss formulations of identity criteria and to take a closer look at one notorious criterion of object identity, Leibniz's Law. The first section concerns the form of identity criteria. The second section concerns the (...) better-regarded half of Leibniz's Law, the indiscernibility of identicals. The third section turns to the more controversial half of Leibniz's Law, the identity of indiscernibles. The author considers alternatives to Leibniz's Law as well as the possibility that there are no adequate identity criteria to be found. (shrink)

Available from UMI in association with The British Library. Requires signed TDF. ;In this thesis I argue that we ought to accept some version of the Analysis view--the view that the identity of a person over time can be analysed in terms of physical and/or psychological continuities. I also argue that there is no sense in which we ought to be ontological reductionists about persons--a person is an essentially embodied, irreducible, entity whose identity over time is analysable in (...) terms of physical and psychological continuities. ;I argue that any plausible theory of personal identity over time is a best-candidate theory, which implies that the identity of a person over time can be extrinsically determined. Some philosophers find this consequence absurd; but I claim that they have no good reason to. I also show how reference to the extrinsicness of identity features in a powerful argument for Derek Parfit's thesis that identity is not "what matters". Finally, I argue that there are plausible counter-examples to all versions of the Physical and Psychological Criteria of personal identity, and that we ought to accept a version of the Mixed Criterion which acknowledges the importance of both sorts of continuity, but which assigns greater weight to the relation of psychological continuity. (shrink)

Much of the debate about identity in recent decades has been about personal identity, and specifically about personal identity over time, but identity generally, and the identity of things of other kinds, have also attracted attention. Various interrelated problems have been at the centre of discussion, but it is fair to say that recent work has focussed particularly on the following areas: the notion of a criterion of identity; the correct analysis of (...) class='Hi'>identity over time, and, in particular, the disagreement between advocates of perdurance and advocates of endurance as analyses of identity over time; the notion of identity across possible worlds and the question of its relevance to the correct analysis of de re modal discourse; the notion of contingent identity; the question of whether the identity relation is, or is similar to, the composition relation; and the notion of vague identity. A radical position, advocated by Peter Geach, is that these debates, as usually conducted, are void for lack of a subject matter: the notion of absolute identity they presuppose has no application; there is only relative identity. Another increasingly popular view is the one advocated by Lewis: although the debates make sense they cannot genuinely be debates about identity, since there are no philosophical problems about identity. Identity is an utterly unproblematic notion. What there are, are genuine problems which can be stated using the language of identity. But since these can be restated without the language of identity they are not problems about identity. (For example, it is a puzzle, an aspect of the so-called “problem of personal identity”, whether the same person can have different bodies at different times. But this is just the puzzle whether a person can have different bodies at different times. So since it can be stated without the language of personal “identity”, it is not a problem about identity, but about personhood.) This article provides an overview of the topics indicated above, some assessment of the debates and suggestions for further reading. (shrink)

One of the central problems of personal identity is to determine what we are essentially . In response to this problem, Lynne Rudder Baker espouses a psychological criterion, that is, she claims that persons are essentially psychological. Baker’s theory purports to bypass the problems of other psychological theories such as Dissociative Identity Disorder and the problem of individuating persons synchronically. I argue that the theory’s treatment of Dissociative Identity Disorder leads to untenable results, is invalid, and (...) consequently fails to individuate persons. (shrink)

ABSTRACT In this article, I reply to criticisms of Dean Stretton of the pro‐life argument from substantial identity. When the criterion for the right to life proposed by most proponents of the pro‐life position is rightly understood – being a person, a distinct substance of a rational nature – this position does not lead to the difficulties Stretton claims it does.

In this paper, I attempt to map out the 'logical geography' of the territory in which issues of mental content and of personal identity meet. In particular, I investigate the possibility of combining a psychological criterion of personal identity with an externalist theory of content. I argue that this can be done, but only by accepting an assumption that has been widely accepted but barely argued for, namely that when someone switches linguistic communities, the contents of their (...) thoughts do not change immediately, but only after the person becomes integrated within the new linguistic community. I also suggest that recent work on personal identity, notably by Derek Parfit, has tacitly assumed internalism regarding mental content. I do not intend to argue for either externalism or a psychological criterion. My aim is merely to explicate the issues involved in making them compatible. (shrink)

Locke’s account of personal identity has been highly influential because of its emphasis on a psychological criterion. The same consciousness is required for being the same person. It is not so clear, however, exactly what Locke meant by ‘consciousness’ or by ‘having the same consciousness’. Interpretations vary: consciousness is seen as identical to memory, as identical to a first personal appropriation of mental states, and as identical to a first personal distinctive experience of the qualitative features of one’s (...) own thinking. There is wide agreement, however, that Locke’s theory of personal identity is meant to complement his moral and theological commitments to a system of divine punishment and reward in an afterlife. But these commitments seem to require also a metaphysical criterion, and Locke is insistent that it cannot be substance. The difficulty reconciling the psychological and metaphysical requirements of the theory has led, at worst, to charges of incoherence and, at best, to a slew of interpretations, none of which is widely accepted. (shrink)

Keränen (2001) raises an argument against realistic (ante rem) structuralism: where a mathematical structure has a non-trivial automorphism, distinct indiscernible positions within the structure cannot be shown to be non-identical using only the properties and relations of that structure. Ladyman (2005) responds by allowing our identity criterion to include 'irreflexive two-place relations'. I note that this does not solve the problem for structures with indistinguishable positions, i.e. positions that have all the same properties as each other and exactly (...) the same relations to all objects (including themselves). I conclude that realistic structuralists must compromise and treat some structures eliminativistically. (shrink)

Landscapes are public environments in which different communities and individuals dwell and which matter to them in ways which are not always consistent. As such they are open to strong conflicts about what the future of landscapes ought to be and who has an entitlement to involvement in a decision about that future. How should such conflicts be resolved? One influential approach is that embodied in the practice of cost-benefit analysis: the strength of preferences for different landscapes is measured by (...) individuals' willingness to pay and the potential Pareto improvement efficiency criterion is employed as a rule of choice. This paper contends that this approach is flawed. It examines an economic valuation study of landscapes in the Yorkshire Dales. Drawing on interviews with farmers in the Dales and on in-depth discussion groups with respondents to other economic valuation studies, it argues that landscape conflicts involve issues of identity that cannot be captured in terms of preference satisfaction and conflicts of perceived rights which could not in principle be resolved by cost-benefit analysis. (shrink)

Multiple selves is a conventional assumption in behavioural welfare economics for modelling intrapersonal well-being. Yet an important question is which self has normative authority over others. In this paper, we advance an argument for what we call the ‘ontological approach’ to personal identity in behavioural welfare economics. According to this approach, ethical questions – such as which preference should be granted normative authority over another – can be informed by the ontological criterion of personal persistence, which aims at (...) determining what it takes for an individual to persist from one time to another. (shrink)

The question of whether it is permissible to quantify into a modal context is re-examined from an empiricist perspective. Following Wiggins, it is argued that an ontology of continuants implies essentialism, but it is also argued, against Wiggins, that the only conception of necessity that we need to start out with is that of analyticity. Essentialism, of a limited kind, can then be actually generated from this. An exceptionally fine-grained identity criterion for continuants is defended in this context. (...) The debate between Wiggins and Ayer over the legitimacy of de re modality is then examined in the light of these results, and it is argued that my position is consistent with Ayer’s minimalist assumptions. It is also argued that non-continuants will not sustain the essential/accidental distinction, thus giving some concessions to the sceptics. It is also shown that there are close connections between these issues and the more modern two-dimensionalist way of disentangling the necessary from the a posteriori, and that the latter needs to learn from the former. (shrink)

This paper examines the impact that recent advances in clinical neurology, introspectionist psychology and neuroscience have upon the philosophical psycho?neural Identity Theory. Topics covered include (i) the nature and properties of phenomenal consciousness based on a study of the ?basic? visual field, i.e. that obtained in the complete dark, the Ganzfeld, and during recovery from occipital lobe injuries; (ii) the nature of the ?body?image? of neurology and its relation to the physical body; (iii) Descartes? error in choosing extension in (...) space as the criterion for distinguishing the physical and the mental; (iv) the technical distinction between sensing and perceiving; (v) why phenomenal Direct Realism is incorrect whereas epistemic DR and the representative theory are correct; (vi) the ontological and topological status of phenomenal space and physical space. This leads to considerations of the current ?binding problems? in neuroscience; the role of the brain mechanisms that construct the sensory fields of phenomenal consciousness; the ?homunculus? fallacy; the key difference between epistemic and non?epistemic perception as revealed by brain injury studies; and how the brain codes information, contrasting topological and vectorial coding, with particular reference to the binding problem. My conclusion is that the Identity Theory is incompatible with the scientific evidence from an integrated approach to modern introspectionist psychology, clinical neurology, and neuroscience. However, Cartesian Dualism is even more incompatible with the evidence. This leaves only two viable theories. The first is Bohr's theory of brain?consciousness complementarity. The second is the Broad?Price?Smythies theory of extension, which is a topological theory of the relation between phenomenal space and physical space. (shrink)

John Locke speaks of personal identity and survival of consciousness after death. A criterion of personal identity through time is given. Such a criterion specifies, insofar as that is possible, the necessary and sufficient conditions for the survival of persons. John Locke holds that personal identity is a matter of psychological continuity. He considered personal identity (or the self) to be founded on consciousness (viz. memory), and not on the substance of either the soul (...) or the body. (shrink)

The dissertation is composed of five papers, each of which either deals with a topic in contemporary metaphysics or uses concepts central to contemporary metaphysics as part of the machinery of its argument. Three papers deal with the problem of personal identity. In Hume on Identity: A Defense I argue that Hume, in maintaining that we are always mistaken in ascribing identity to persons, is presenting a fundamental metaphysical problem about identity through change, not trying to (...) analyze the way we talk about change as his contemporary critics charge. I explicate Hume's argument for this alarming conclusion and show it is far more powerful than has been realized. In Parfit on Identity, I criticize recent attempts to reduce persons to series of psychophysical states or stages. I outline a Realist account of persons and argue that identity is what matters in survival. In Memories, Brains, and Identity, I attack John Locke's contention that present identity is a function of present experience. I use counter-instances derived from the literature on split-brains to show that my present experience could have belonged to someone else. A consequence is that the memory criterion of personal identity is essentially incomplete. ;Examples from the literature on personal identity involving fissioning are central to Abortion and The Control of Human Bodies in which I argue that an organism with a strong right to life has a right to the continued use of the biological equipment, the use of which it acquires through the species-typical process of its own creation. A consequence is that if a fetus is a person, he has the right to the continued use of the mother's womb whether she has given it to him or not. ;The papers on Locke and Parfit rely upon the apparatus of possible worlds, which is central to Dreaming and Certainty. If I believe that I am in a world in which I have conclusive evidence that I am awake, and there is a possible world in which I have the same belief and it is false, can I know which is actual on the basis of the evidence I believe is conclusive? I argue that being wide-awake is a self-recognizing state: when I'm not in it I can mistakenly believe that I am in it, but when my belief is true, I know it. I argue that this enables me to recognize that I am not dreaming. (shrink)

The Research Studies The Problem Of Personal Identity, Dealing With The Nature/Source Of The Problem, The Approach Of Traditional/Modern Philosophers And Its Proper Analysis. It Finally Shows That Bodily Continuity Is The Primary Criterion Of Personal Identity.

Nelson Goodman argues against those who, like Carnap, claim extensional identity is the criterion for correct constructional definition. Goodman argues that internal logical difficulties sink such a criterion, thus he proposes his own criterion of extensional isomorphism. We argue that Goodman's criterion itself falls prey to his own arguments or else extensional identity is not shown faulty.

This paper offers a metaphysical explanation of the identity and distinctness of concrete objects. It is tempting to try to distinguish concrete objects on the basis of their possessing different qualitative features, where qualitative features are ones that do not involve identity. Yet, this criterion for object identity faces counterexamples: distinct objects can share all of their qualitative features. This paper suggests that in order to distinguish concrete objects we need to look not only at which (...) properties and relations objects instantiate but also how they instantiate these properties and relations. I propose that objects are identical when they stand in certain qualitative relations in virtue of their existence. And concrete objects are distinct when they do not stand in the same kinds of relations to one another in virtue of their existence. (shrink)

This chapter examines how Spinoza deals with the identity problem by looking at his account of material and mental things. To understand how material things can remain the same over time, it looks at the “Physical Digression” where Spinoza explains the constitution of bodies. By using the structural criterion, Spinoza can solve a number of problems concerning identity and change. Spinoza would say that there is no identity between the body before and after the accident because (...) the proportion between its moving and non‐moving parts is no longer the same. Memory plays no decisive role, and can therefore be disregarded in the account of diachronic identity. Spinoza goes far beyond the Aristotelian conception by spelling out the form in kinetic terms for material things, and in representational terms for mental things. (shrink)

Plural identity—the relation of identity between some things xx and some things yy—has been standardly defined in terms of the plural relation one of (or among). This paper challenges that standard view. To that end, it will be argued, first, that the identity relation, singular or plural, can only be defined in a higher-order language, second, that the standard definition of plural identity in terms of the one of (or among) relation should be regarded instead as (...) providing a criterion of identity for pluralities of some particular kind, and third, that there are pluralities of another kind with which a different criterion of identity is associated. The upshot will be that plural identity as standardly defined cannot be the plural counterpart of singular identity. (shrink)

Discussion of the human soul has bulked large in the literature of philosophy and religion. I defend the possibility of disembodied Cartesian minds by examining the criticisms of three philosophers who argue that there are serious difficulties about any attempt to account for the identity of such Cartesian minds through time. I argue that their criticisms of the possibility of disembodied minds are damaging but not fatal. I hold that the central issue behind their criticisms of Cartesian minds is (...) whether any nonphysical mental criterion can be formulated for the identity of such entities. Even though no such criterion can be given, disembodied minds that persist through time remain logical possibilities. (shrink)

I discuss donald davidson's argument for the psycho-Physical identity theory and contend that it fails: it relies on an implausible account of mental and physical events. Davidson proposes a linguistic test for determining whether a given event is mental or physical. I argue that the assumptions that are necessary for employing such a criterion of the mental are either false or presuppose the truth of the identity theory.

Many contemporary authors argue that since certain Hindu texts and traditions claim that all living beings are fundamentally the same as Brahman (God), these texts and traditions provide the basis for an environmental ethic. I outline three common versions of this argument, and argue that each fails to meet at least one criterion for an environmental ethic. This doesn’t mean, however, that certain Hindu texts and traditions do not provide the basis for an environmental ethic. In the last section (...) of the paper I briefly outline and defend an alternative, according to which all plants and animals have intrinsic value and direct moral standing in virtue of having a good. (shrink)

Putnam raises two objections against the token-identity theory in his _Dewey Lectures. (1) Token-physicalism invokes a mysterious or _sui generis concept of identity between mental and physical event tokens; (2) The theory suffers from explanatory failure because it cannot individuate mental events using physical criteria. I argue that the first claim is false, since Davidson adopts the same criterion of identity Quine employs for ordinary objects which invokes a concept of identity we understand clearly enough. (...) I then show that Putnam's second complaint is an extravagant demand that needs not be answered and is at odds with his own direct realism. (shrink)

W.V.O. Quine has famously objected that (1) properties are philosophically suspect because (2) there is no entity without identity and (3) the synonymy criterion for property identity won't do because there's no such concept as synonymy. (2) and (3) may or may not be right but do not prove (1). I reply that Leiniz's Law handles property identity, as it does for everything else, then respond to a variety of objections and confusions.

We study here equiformity, the standard identity criterion for sentences. This notion was put forward by Lesniewski, mentioned by Tarski and defined explicitly by Presburger. At the practical level this criterion seems workable but if the notion of sentence is taken as a fundamental basis for logic and mathematics, it seems that this principle cannot be maintained without vicious circle. It seems also that equiformity has some semantical features ; maybe this is not so clear for individual (...) signs but sentences are often considered as meaningful combinations of signs. If meaning has to play a role, we are thus maybe in no better position than when dealing with identity criterion for propositions. In formal logic, one speaks rather about well-formed formulas, but closed formulas are called sentences because they are meaningful in the sense that they can be true or false. Formulas look better like mathematical objects than material inscriptions and equiformity does not seem to apply to them. Various congruencies can be considered as identities between formulas and in particular "to have the same logical form". One can say that the objects of study of logic are rather logical forms than sentences conceived as material inscriptions. (shrink)

Four-dimensionalism, the stage theory version in particular, has been defended as the best solution for avoiding vagueness in regards to composition, persistence and identity. Stage theory is highly problematic by itself, and the two views usually packed with it, unrestricted composition and counterpart theory, are a heavy burden. However, dispensing with these two views, four-dimensionalism could avoid vague persistence by issuing a criterion that would establish sharp temporal boundaries for the existence of genuine entities (simples, molecules and living (...) organisms). This would avoid vague existence and vague identity, but in a way that is still compatible with endurantism. Nevertheless, a minimal (substantialist) four-dimensionalism, a worm perdurantist ontology, would fit better with the unique way in which organisms persist: by retaining both identity and intrinsic change. (shrink)

Ethical theories must include an account of the concept of a person. They also need a criterion of personal identity over time. This requirement is most needed in theories involving distributions of resources or questions of moral responsibility. For instance, in using ethical theories involving compensations of burdens, we must be able to keep track of the identities of persons earlier burdened in order to ensure that they are the same people who now are to receive the compensatory (...) benefits. Similarly, in order to attribute moral responsibility to someone for an act, we must be able to determine that that person is the same person as the person who performed the act. Unfortunately, ethical theories generally include a concept of a person and criteria of personal identity either as notions implied or presupposed by the already worked out theory, with little or no argument given in support of them. But both approaches are unsatisfactory, for each runs the risk of ignoring certain fundamental features of the way persons actually are. What is needed first is a plausible metaphysical account of persons and personal identity to which an ethical theory might then conform and apply. Derek Parfit has attempted to provide such an account in Reasons and Persons, where he argues for what he calls the reductionist view of persons and personal identity and then attempts to show how such a conception provides a metaphysical background that lends important partial support to utilitarianism. 1 But Parfit’s metaphysical view is neutral between two possible conceptions of personhood, and utilitarianism presupposes the truth of the more radical of the two conceptions, which precludes the possibility of there being a class of goods crucial to any plausible ethical theory. Utilitarianism thus presupposes a wildly implausible conception of persons, and so is itself implausible. (shrink)

In Towards Non-Being Graham Priest proposes an informative criterion of identity across possible worlds. Roughly, the criterion says that whenever two objects satisfy the very same qualitative characteristics in every possible world they are identical. But Priest also maintains that there are qualitatively indiscernible possible worlds. It is argued in the paper that for this reason he should allow the existence of two numerically different but qualitatively identical objects, and that is in tension with the criterion (...) of transworld identity he has proposed. Thus Priest should reject either his criterion of transworld identity, or the thesis of possibleexistence of qualitatively indiscernible worlds. (shrink)

Should Christians support the view that one’s psychological continuity is the main criterion of personal identity? Is the continuity of one’s brain or memory states necessary and sufficient for the identicalness of the person? This paper investigates the plausibility of the psychological continuity theory of personal identity, which holds that the criterion of personal identity is certain psychological continuity between persons existing at different times. I argue that the psychological continuity theory in its various forms (...) suffers from interminable problems. Then, I introduce an alternate account of personal identity, according to which personal identity is not further analyzable in terms of qualitative properties of persons. Rather, persons are individuated by their primitive thisnesses, which are nonqualitative properties of immaterial substances. This alternate conception of personal identity would be of particular relevance to those who believe in the immortality of the soul and are looking for a nonphysicalist account of personal identity. (shrink)

It is not the case that there is only one literal sense of “same person.” When presented in different contexts, “she is/is not the same person” can have different answers concerning the same entity or set of entities across the same period of time. This is because: Persons are composed of many parts, and different parts have different persistence conditions. This follows from a reductionist view of the self. When we ask about sameness of persons, or “personal identity,” we (...) are asking because of certain practical concerns. Different concerns will look to the persistence of different parts of the person for criteria of sameness. No single criterion of sameness tracks all concerns. By combining reductionism with contextualism, the disparate answers to the personal identity question can be clarified without losing the practical concerns motivating them. (shrink)

Following insights from the New Theory of Reference, it has become widely accepted that theoretical identities like ‘water = H2O' are necessary. However, some have challenged this claim. I propose yet another challenge in the form of a sceptical argument. The argument is based on the contention that the necessity of theoretical identities is dependent upon criteria of identity. Thus, a theoretical identity is necessary given one criterion of identity but contingent given another. Since we do (...) not know which criteria of identity in fact obtain, it follows that, for all we know, theoretical identities may not be necessary. (shrink)

After motivating the general problem of personal identity and considering several possible accounts, this entry reviews a variety of arguments for and against the animalist criterion of personal identity.

In this paper, a general perspective on criteria of identity of kinds of objects is developed. The question of the admissibility of impredicative or circular identity criteria is investigated in the light of the view that is articulated. It is argued that in and of itself impredicativity does not constitute sufficient grounds for rejecting a putative identity criterion. The view that is presented is applied to Davidson’s criterion of identity for events and to the (...) structuralist criterion of identity of places in a structure. (shrink)

I am now typing on a computer I bought two years ago. The computer I bought is identical to the computer on which I type. My computer persists over time. Let us divide our subject matter in two. There is first the question of criteria of identity, the conditions governing when an object of a certain kind, a computer for instance, persists until some later time. There are secondly very general questions about the nature of persistence itself. Here I (...) include the question of temporal parts, as well as certain familiar paradoxes (e.g., the statue and the lump). Following John Perry (1975, Introduction), let us characterize a criterion of identity over time for F s as a way of filling in φ in the following schema: Stages S1 and S2 belong to some continuing F iff φ Defenders of temporal parts (see below) regard S1 and S2 as being temporal parts of the continuing F ; others regard S1 and S2 as different stages in the life history of the continuing F . Thus each camp can make use of Perry’s formula. It is traditional to divide such criteria into those governing persons and those governing anything else. It is further traditional to say that the criterion of identity over time for non-persons involves spatiotemporal continuity. An excellent discussion is Eli Hirsch’s The Concept of Identity1, which utilizes the notion of continuity under a sortal. Kind-terms, or sortals, are terms that specify what kind of or sort of thing an object is. Examples include ‘tree’, ‘car’, and ‘mountain’. Where F is a sortal, Hirsch’s analysis is roughly that stages belong to the same F iff they are connected by a spatiotemporally and qualitatively continuous sequence of F -stages. Unmodified, this analysis prohibits temporally discontinuous entities, such as a watch that is taken apart and then reassembled. Hirsch discusses the necessary modifications. Spatiotemporal continuity analyses face a problem when applied to the persistence of matter. The literature here has been dominated by discussion of examples provided by David Armstrong (1980) and Saul Kripke (unpublished.... (shrink)

Lockean views of personal identity maintain that we are essentially persons who persist diachronically by virtue of being psychologically continuous with our former selves. In this article, I present a novel objection to this variant of psychological accounts, which is based on neurophysiological characteristics of the brain. While the mental states that constitute said psychological continuity reside in the cerebral hemispheres, so that for the former to persist only the upper brain must remain intact, being conscious additionally requires that (...) a structure originating in the brainstem—the ascending reticular activating system—be functional. Hence, there can be situations in which even small brainstem lesions render individuals irreversibly comatose and thus forever preclude access to their mental states, while the neural correlates of the states themselves are retained. In these situations, Lockeans are forced to regard as fulfilled their criterion of diachronic persistence since psychological continuity, as they construe it, is not disrupted. Deeming an entity that is never again going to have any mental experiences to be a person, however, is an untenable position for a psychological account to adopt. In their current form, Lockean views of personal identity are therefore incompatible with human neurophysiology. (shrink)

In ‘The Concept of a Person’ Ayer presents a theory of personal identity which has never, to my knowledge, attracted the close attention which it deserves. The theory puts forward bodily continuity as the central criterion of personal identity. In this, of course, Ayer does not differ from many other philosophers who have written on this subject. The real interest of Ayer's view is that it is quite explicit that the body is taken as the principle of (...) unity underlying one's experiences, as that in virtue of which a series of experiences are the experiences of one person. Without the body, ‘not only is it not clear how the individual experiences are to be identified, but there appears to be no principle according to which they can be grouped together; there is no answer to the question what makes two experiences which are separate in time the experiences of the same self’ . Some link between experiences there must be. Memory cannot serve as this link, since remembering an experience already implies thinking of it as one's own. The only acceptable candidate is the body. (shrink)

Since Geach did not give any account of what is to be considered the same form of relative identity, I assumed that 'x is the same A as y' expresses the same form of relative identity as 'x is the same B as y' if and only if 'A' means the same as 'B'. If this is an incorrect assumption, then I must ask what is the criterion of identity for forms of relative identity?

This article is a return to a theme I first tackled in “The Stoic criterion of identity” : the Academics’ ‘Growing Argument’ and the Stoic response to its attack on diachronic identity. This time my aim is to separate out approximately five different stages of the debate between the two schools. This will be done by shifting more of the focus onto developments that seem likely to belong to the late second and/or early first century BC.

The notion of identity is investigated through Aristotle and Hegel as supporters of two different ontological conceptions: pluralism of substances and relational holism. Through Aristotle, I examine both the thesis according to which the identity of an object is constituted by its properties and the difficulties which this thesis encounters. Aristotle easily defines the identity in species, in genus, and in number; some problems arise regarding the identity of individuals: for these, it is not enough to (...) indicate the definition and the proper qualities, but matter is needed. Matter cannot, however, be a criterion for identifying duplicate objects: in this case, it plays at most the role of a “weak individuator.” A weak individuator involves relations with other entities. The use of relations in determining the identity of an entity is extensively treated by Hegel, according to whom, in order to define the identity of an object a multiplicity of particular objects is required and, therefore, relations among entities. I conclude by proposing a notion of the object understood not as an independent, separate, and autonomous item, but as a portion of the world, which is given in a phenomenological context and identifies a dialectical context. (shrink)

Theories of personal identity in the tradition of John Locke and Derek Parfit emphasize the importance of psychological continuity and the abilities to think, to remember and to make rational choices as a basic criterion for personhood. As a consequence, persons with severe dementia are threatened to lose the status of persons. Such concepts, however, are situated within a dualistic framework, in which the body is regarded as a mere vehicle of the person, or a carrier of the (...) brain as the organ of mental faculties. Based on the phenomenology of embodiment, this paper elaborates a different approach to personal identity in dementia. In this perspective, selfhood is primarily constituted by pre-reflective self-awareness and the body memory of an individual, which consists in the embodiment and enactment of familiar habits, practices and preferences. After describing the different types of body memory, the paper develops a phenomenology of dementia as a loss of reflexivity and meta-perspective. This is contrasted with the preservation of individual forms of body memory even in the later stages of the illness. The ethical consequences of an embodied approach to dementia are outlined. A final look is given to narrativistic and constructionist concepts of the self in dementia. (shrink)

Richard Popkin gives the frame into which the topics of the colloquium fit: Cartesian skepticism about our knowledge of the existence of the self and the external world. Robert Fogelin sketches a prescriptive model for human action, using classical and contemporary ideas on the grammar of act descriptions. Following these individual papers, there are three symposia, consisting of a paper, comments, and author's reply. In the first, with Philip Hugly as commentator, Fred Dretske attempts to undercut skeptical attack on the (...) validity of ordinary perceptual claims. He holds that an epistemic perceptual report conveys two items: a description, and a justification of the increment in knowledge which is the crux of each particular claim. The second symposiast is Roderick Chisholm, writing with historical fluency and analytic skill on the loose and strict senses of identity. In his comments, S. Shoemaker offers a "special concern" criterion for personal identity. In the third symposium, Jaakko Hintikka argues that the logic of perceptual terms is modal, in the extended sense that most of the words used to express propositional attitudes, words like 'knows', 'believes', 'strives', serve as modal operators. Romane Clark is Hintikka's commentator. Again, the comments seem genuinely helpful in clarifying or emphasizing the issues for the reader. Hintikka tells us that he finds that traditional problems in perception are closely related to difficulties logicians have met as they try to understand the interplay between modal notions and the basic logical concepts of identity and existence. His comment expresses the sense of discovery and promise which pervades these papers. It strikes one that this Colloquium achieved a felicitous combination of high-level technique and creative scholarship.--M. B. M. (shrink)

Criticism of Locke's account of personal identity has proceeded cumulatively. Three years after the publication of the chapter “Of Identity and Diversity”, John Sergeant raised an objection which, in Bishop Butler's hands, was to become famous as the dictum that “one should really think it self-evident that consciousness of personal identity presupposes, and therefore cannot constitute, personal identity: any more than knowledge, in any other case, can constitute truth, which it presupposes”. Berkeley added, in effect, that (...) when consciousness is taken to be the criterion of personal identity, one must admit that a man conscious of segments of his life at some times and not at others both is — because “conscious of” states a transitive relation — and is not — because of lack of consciousness—the same person. (shrink)

This paper examines Parfit's argument that personal identity is not what matters, focusing on his case against reductionist theories of personal identity. I argue that Parfit's reasons for rejecting reductionist views do not take the physical criterion for personal identity seriously enough. I outline a thoroughly naturalistic version of the reductionist theory that, if true, would escape Parfit's criticism. Such a view would be a plausible candidate for a relation that would matter as much as, if (...) not more than, the non identity relation advocated by Parfit. (shrink)

1. What is the Problem of Personal Identity?Locke posed the problem of personal identity in one brief question, “What makes the same person?” This formulation is deceptively simple. My aim is to offer a new interpretation of the problem and to suggest a method for finding a solution.Investigations of personal identity are usually cast in terms of finding the criterion for personal identity. Yet talk of criteria is ambiguous. In one sense of the term, the (...) criterion of personal identity would be special evidence for personal identity. According to the second usage, the criterion of personal identity would be that state of affairs for which evidence for personal identity is evidence. We will not be concerned with the first construal. On that reading, the problem of personal identity would be an epistemological issue. But the basic question concerning personal identity, “What is one person?” does not appear to be an epistemological question. (shrink)

This paper is a modification of Nicola Guarino and Christopher Welty's conception of the subsumption relation. Guarino and Welty require that that whether one property may subsume the other should depend on the modal metaproperties of those properties. I argue that the part of their account that concerns the metaproperty carrying a criterion of identity is essentially flawed. Subsequently, I propose to constrain the subsumption relation not, as Guarino and Welty require, by means of incompatible criteria of absolute (...) identity but by means of incompatible criteria of relative identity. After discussing the benefits of applying relative identity in ontological investigations I provide a formal framework in which to prove a counterpart of the identity criteria constraint. (shrink)

In this essay, I first solve solve a conundrum and then deal with criteria of identity, Leibniz's definition of identity and Frege's adoption of it in his (failed) attempt to define the cardinality operator contextually in terms of Hume's Principle in Die Grundlagen der Arithmetik. I argue that Frege could have omitted the intermediate step of tentatively defining the cardinality operator in the context of an equation of the form ‘NxF(x) = NxG(x)'. Frege considers Leibniz's definition of (...) class='Hi'>identity to be purely logical, although without saying why it is in line with his logicist project. I argue that the universal criterion of identity that Frege takes from Leibniz's definition and the specific criterion of identity for cardinal numbers embodied in Hume’s Principle (namely equinumerosity) work hand in hand in the tentative contextual definition of the cardinality operator. Yet the interplay between the two criteria is powerless to prevent the emergence of the Julius Caesar problem, let alone suggests how it could be solved. The final explicit definition of the cardinality operator that Frege sets up still rests on the identity criterion of equinumerosity since cardinal numbers are defined as equivalence classes of that relation. (shrink)

We develop a criterion for telling when integrating two pieces of information, e.g. two pictures or statements requires an understanding of perspective. Problems that require such an understanding are perspective problems. With this criterion we can show that understanding false beliefs vis-à-vis reality pose a perspective problem, so does understanding spatial descriptions given from different viewing points (a classical example of what is commonly seen as a problem of perspective) and individuating objects with different sortals (naming objects). We (...) use the result that understanding false belief as well as alternative naming of objects are both perspective problems to explain the otherwise inexplicable developmental finding that children master these two tasks at about the same time, around the age of 4 years. (shrink)