Puzzle Cases in Personal Identity

The paper criticizes pessimistic views on survival into teletransporter. It is considered, in particular, the recent attempt of Alexey Kardash and Konstantin Morozov to defend the pessimists’ views by means of the criterion of mereorganic continuity. This defence faces two serious problems. Firstly, it is based on a fundamentally flawed description of the mechanics of teleportation. Under the guise of teletransportation, the procedure discussed is quite different — replication (creation of a perfect copy for some original object from suitable matter). (...) Secondly, the prohibition on the survival of objects by instantaneous replacement of all their parts derived from the criterion of mereorganic continuity cannot be component of any consistent (yet plausible) mereology. (shrink)

Since its proposal in 1984, Derek Parfit’s ‘Non-Identity Problem’ has significantly influenced how social choice theorists understand existential harms and benefits. The ‘problem’ raises the question of whether parents act wrongly when they choose to create a child with a life barely worth living. It suggests that if the alternatives would have either resulted in a life not worth living or non-existence, then the parents are not liable for moral criticism. This article challenges Parfit’s premise by advocating for a Minimal (...) Concern Clause that is generated through the parental relation. The Clause operates under the assumption that non-existence is not a valanced experiential state and is thus not comparable to any positive state of existence. The argument unfolds in two main steps: firstly, it disputes the premise in Same-Number Cases by proposing an alternative semantic distinction between objects of reference, particularly, the status of a merely possible person. Secondly, it contends that in Different-Number Cases, parents are obligated to exercise minimal prudence under conditions of uncertainty, and that the moral weight of the Minimal Concern Clause must be compounded to reflect the replicable nature of procreation. (shrink)

In an earlier paper in Theoria, I discussed an argument based on the idea of “soul-switching” that attempted to undermine the immaterialist account of human beings. The present paper deals with a parity argument against that argument in which the idea of “body-switching” plays a pivotal role. I call these two arguments, that have been reported by Razi (d. 1210), respectively “the soul-switching argument” and “the body-switching argument”. After some introductory remarks, section 2 of the paper describes the structure of (...) the latter argument. Section 3 considers some philosophical discussions in the ancient, modern, and contemporary eras in which the idea of body-switching (or some similar conception) plays a major role. In the following section 4, some criticisms of the argument are discussed and a general response that is meant to cover a broad range of objections is considered. This paper shows that the body-switching argument reported by Razi is a methodological antecedent of several contemporary arguments in defence of substance dualism. (shrink)

Abstract: This working paper focuses on the question whether there is a therapeutic imperative that, in specific situations, would oblige us to perform genome editing at the germline level in the context of assisted reproduction. The answer to this central question is discussed primarily with reference to specific scenarios where preimplantation genetic diagnosis (PGD) does not represent an acceptable alternative to germline genome editing based on either medical, or ethical, or – from the perspective of the potential parents – moral (...) or religious grounds. This article deals with four different types of case constellations that result from these possible reasons against PGD as well as from the necessity or dispensability of a subsequent “control PGD.” These cases are discussed based on hypotheses concerning contextual factors and theoretical assumptions. In conclusion, we point out that if our assumptions are correct, there is probably no therapeutic imperative for genome editing at the germline level. We draw this rationale from the fact that germline interventions are likely not person-affecting. However, we caution the reader that our result is preliminary and needs to be more carefully examined in future work in light of the bioethical debate and potential objections. -/- // Abstract: Im Zentrum dieses Working Papers steht die Frage, ob es einen therapeutischen Imperativ geben kann, der uns, in bestimmten Situationen, verpflichten würde, eine Genomeditierung (genome editing) auf Keimbahnebene im Rahmen der assistierten Befruchtung vorzunehmen. Die Antwort auf diese zentrale Frage wird insbesondere mit Bezug auf Fälle diskutiert, in denen das Verfahren der Präimplantationsdiagnostik (PID) keine aus entweder medizinischen oder ethischen oder – aus Sicht der potentiellen Eltern – moralischen bzw. religiösen Gründen akzeptable Alternative zu einem Keimbahneingriff darstellt. Die möglichen Gründe gegen die PID sowie die Erforderlichkeit oder Verzichtbarkeit einer nachfolgenden «Kontroll-PID» ergeben vier verschiedene Fallkonstellationen, denen sich der Beitrag zuwendet. Auf Grundlage von Hypothesen zu kontextuellen Faktoren und theoretischen Annahmen diskutieren wir diese Fälle. Im Ergebnis verweisen wir darauf, dass es, wenn unsere Annahmen zutreffen, vermutlich keinen therapeutischen Imperativ zum genome editing auf Keimbahnebene gibt. Dies begründet sich daraus, dass der Keimbahneingriff vermutlich nicht als personenbezogen (person-affecting) zu bezeichnen ist. Wir weisen jedoch darauf hin, dass unser Ergebnis vorläufig ist und unter Berücksichtigung der bioethischen Debatte und möglicher Einwände genauer geprüft werden muss. -/- // Résumé: Ce Working Paper se concentre sur la question de l’existence d’un impératif thérapeutique qui, dans des situations spécifiques, nous obligerait à réaliser une édition du génome au niveau de la lignée germinale dans le cadre de la procréation assistée. Afin de répondre à cette question centrale nous développons quatre scénarios spécifiques dans lesquels le diagnostic préimplantatoire (DPI) ne représente pas une alternative acceptable à l’édition du génome germinal pour des raisons médicales, éthiques ou – du point de vue des futurs parents – morales ou religieuses. Cet article traite de quatre constellations différentes de cas résultant des raisons mises en avant pour s'opposer au DPI ainsi que de la nécessité ou de l’inutilité d’un ultérieur « DPI de contrôle » Ces cas sont discutés sur la base d’hypothèses portant sur les facteurs contextuels et sur les présupposés théoriques. En conclusion, nous soulignons que si nos hypothèses sont correctes, il n’y a probablement aucun impératif thérapeutique justifiant l’édition du génome au niveau de la lignée germinale. Nous arrivons à cette conclusion parce qu’une intervention au niveau de la lignée germinale n’est probablement pas susceptible d’affecter la personne. Cependant, nous mettons en garde le lecteur sur le fait que notre conclusion est préliminaire et qu’elle doit être examinée avec soin dans des futurs travaux instruits par le débat bioéthique et par les éventuelles objections. (shrink)

Thought experiments that concoct bizarre possible world modalities are standard fare in debates on personal identity. Appealing to intuitions raised by such evocations is often taken to settle differences between conflicting theoretical views that, albeit, have practical implications for ethical controversies of personal identity in health care. Employing thought experiments that way is inadequate, I argue, since personhood is intrinsically linked to constraining facts about the actual world. I defend a moderate modal skepticism according to which intuiting across conceptually incongruent (...) worlds constitutes ‘invalid intuitioninferences’—i.e., carrying over intuitions gathered from facts about possible worlds that are at odds with facts about the actual world, for the purpose of making claims about real-life persons and their identity, leads to conceptual incongruences. Such a methodological fallout precludes accurate, informative judgments about personal identity in the actual world, calling into question the adequacy of thought experimental considerations for potential real world applications in medical ethics. (shrink)

A main element in Richard Swinburne’s (2019) argument for substance dualism concerns the conditions of a person’s continued existence over time. In this commentary I aim to question two things: first, whether the kind of imaginary cases that Swinburne relies on to make his case should be accorded the kind of weight he supposes; and second, whether philosophers should be concerned to give any substantial theory, of the sort that dualism and its competitors are apparently meant to provide, to explain (...) the conditions of personal identity after all. My suggestion, instead, will be that the concept of a person’s continued existence is better taken as philosophically unanalyzable. (shrink)

The epistemology of self-locating belief concerns itself with how rational agents ought to respond to certain kinds of indexical information. I argue that those who endorse the thesis of Time-Slice Rationality ought to endorse a particular view about the epistemology of self-locating belief, according to which ‘essentially indexical’ information is never evidentially relevant to non-indexical matters. I close by offering some independent motivations for endorsing Time-Slice Rationality in the context of the epistemology of self-locating belief.

This essay explores the topic of Dissociative Identity Disorder (formerly called “Multiple Personality Disorder”) with special attention to such Quadrophenia masterpieces as “Dr. Jimmy” and “The Real Me.” A number of major philosophical questions arise: Can two or more “persons” really inhabit the same body? How can we hold Dr. Jimmy morally responsible for the reprehensible actions of Mr. Jim? Wouldn’t it be wrong to do so if they are really different people? What is it to be the “same” person (...) over time? Does Dr. Jimmy really have free will? The focus is on the much discussed and important notions of personal identity, free will, and moral responsibility. (shrink)

Suppose that you're lying in bed. You just woke up. But you're alert. Your mind is clear and you have no distractions. As you lie there, you think to yourself, ‘2 + 2 = 4.’ The thought just pops into your head. But, wanting to be sure of your mathematical insight, you once again think ‘2 + 2 = 4’, this time really meditating on your thought. Now suppose that you're sitting in an empty movie theatre. The lighting is normal (...) and the screen in front of you is blank. Then at some point an image of a peach is flashed on the screen. The image isn't up there for long. In fact, it's only on the screen for what seems like an instant—just long enough for you to see it. These two scenarios are a bit mundane. But, as I will show, reflection on them can yield significant results concerning the nature of persons and their persistence through time. First I will show that thought and perception have temporal constraints whereby your thinking or perceiving in the above scenarios implies that you exist through a temporally.. (shrink)

Personal identity is one of the important and complex issues in the field of the philosophy of the soul. It is also related to the philosophy of ethics and metaphysics in different respects and has given rise to some problems in these two areas. The justification of ethical responsibility and man's eternity in the posthumous state have attracted psychologist-philosophers' attention to the significance and necessity of explaining personal identity. This paper examines the issue from the view point of Mulla Sadra. (...) Here, the writer initially refers to some of the most important contemporary theories about personal identity which can generally be divided into two reductionist and non-reductionist branches. Reductionists intend to reduce the human identity to elements such as memory, biological specifications, or continuous psychological states, while non-reductionists are against this. Mulla Sadra's theory in this regard is not in conformity with any of the above theories; however, it is more consistent with the non-reductionist approach from certain aspects. Though relying on the fundamental ontological and psychological principles of his own philosophy, Mulla Sadra tries to present a picture of human identity that, while depending on human nature, reveals personal identity, too. This is an identity in whose process of formation the three elements of habits, intentions, and acts play major roles. The extent of the consistency of these three elements with rationality is the reason behind having people with different identities. It should also be added that no human being enjoys a single and fixed identity; rather, identity is a continuous reality that, while being one, is a plural truth. (shrink)

It is hard to see why the head and other brain-containing parts of a person are not themselves persons, or at least thinking, conscious beings. Some theorists have sought to reconcile us to the existence of thinking person-parts. Others have sought to avoid them but have relied on radical theories at odds with the metaphysic implicit in ordinary ways of thinking. This paper offers a novel, conservative solution, one on which the heads and other brain-containing parts of persons do exist (...) but are neither persons, thinkers, nor conscious beings. A much briefer statement of the solution is found in section 5 of Burke 2004. (shrink)

The central claim of the Parfitian psychological approach to personal identity is that the fact about personal identity is underpinned by a non-branching psychological continuity relation. Hence, for the advocates of the Parfitian view, it is important to understand what it is for a relation to take or not take a branching form. Nonetheless, very few attempts have been made in the literature of personal identity to define the non-branching clause. This paper undertakes this task. Drawing upon a recent debate (...) between Anthony Brueckner and Harold Noonan on the issue, I present three candidates for the non-branching clause. (shrink)

Dion is a full-bodied man. Theon is that part of him which consists of all of him except his left foot. What becomes of Dion and Theon when Dion’s left foot is amputated? In Burke 1994, employing the doctrine of sortal essentialism, I defended a surprising position last defended by Chrysippus: that Dion survives while the seemingly unscathed Theon perishes. This paper defends that position against objections by Stone, Carter, Olson, and others. Most notably, it offers a novel, conservative solution (...) to the many-thinkers problem, a solution that enables us to accept the existence of brain-containing person-parts while denying that those person-parts are thinking, conscious beings. (shrink)

Those who endorse the Psychological Continuity Approach (PCA) to analyzing personal identity need to impose a non-branching constraint to get the intuitively correct result that in the case of fission, one person becomes two. With the help of Brueckner's (2005) discussion, it is shown here that the sort of non-branching clause that allows proponents of PCA to provide sufficient conditions for being the same person actually runs contrary to the very spirit of their theory. The problem is first presented in (...) connection with perdurantist versions of PCA. The difficulty is then shown to apply to endurantist versions as well. (shrink)

Could we transfer you from your biological substrate to an electronic hardware by simulating your brain on a computer? The answer to this question divides optimists and pessimists about mind uploading. Optimists believe that you can genuinely survive the transition; pessimists think that surviving mind uploading is impossible. An influential argument against uploading optimism is the multiplicity objection. In a nutshell, the objection is as follows: If uploading optimism were true, it should be possible to create not only one, but (...) multiple digital versions of you. However, you cannot literally become many. Hence, you cannot survive even a single instance of uploading, and optimism about uploading is misguided. In this paper, I will first spell out the multiplicity objection in detail and then provide a two-pronged defence against the objection. First, uploading pessimists cannot establish that uploading optimism has the contentious implication. Second, it is in fact plausible to think that we could become multiple distinct persons. Optimists’ hope for a digital afterlife is therefore not thwarted by the prospect of multiplicity. (shrink)

We need to understand personal identity to develop radical life extension technologies: mind uploading, cryonics, digital immortality, and quantum (big world) immortality. A tentative solution is needed now, due to the opportunity cost of delaying indirect digital immortality and cryonics. However, solving the problem of personal identity is not easy. Human personal identity is a complex thing, not similar to other types of identity, such as that of Theseus ship. First of all, human identity consists of two intertwined types of (...) identity: informational identity, which predicts sameness, and identity of consciousness, which predicts what I will experience in the next moment of time. The identity of consciousness is called "hard problem of identity", and it is because it supervenes on the nature of consciousness. The second feature of human personal identity is that it is observed and measured internally, by identity subject himself. The third is that it evolves in time. -/- The main dichotomy in the views on personal identity and copies can be presented as: either my copy=original or a soul exists. In other words, some non-informational identity carrier (NIIC) may exist that distinguishes the original from its exact copy. Typically, it is often claimed that NIIC is either continuity of consciousness, or soul, or perspective, or the sameness of atoms, or position in space. We create an exhaustive map of identity theories. -/- We demonstrate here that the idea of continuity of consciousness is very similar to the idea of soul, but also has several problems: - Is it the continuity of qualia, of causal processes, of computations or of underlying substrate? - We also show that continuity doesn't prevent the emergence of two future copies if they split smoothly, so continuity does not preserve identity as uniqueness. - Also, continuity doesn't ensure uniqueness as I can continually become someone else. - Continuity + MWI means that I will eventually become anyone, that is, open individualism. - Continuity also can be paradoxically preserved without preserving body and mind as a separate process like flame. - Humans also seems to survive discontinuity during sleep without problems. Nevertheless, continuity appears to be inherent to qualia, emerging after observation but before action, and in planning. Only if continuity of consciousness is an ontological necessity, it can be a valid NIIC, but this is true only in a specific version of solipsism (qualia dust theory). In that case, a specific set of personal qualia becomes the personality carrier. -/- If copy=original then even imperfect copies suffice for personal immortality, as self-recognition becomes the main criterion of identity. -/- Open and closed individualism deny the existence of identity but must reinvent it as "practical identity" and therefore revert to copy=original. -/- To resolve the main dichotomy, we must recognize that personal identity requires an overarching system: God, qualia world, social agreement, or evolutionary fitness. This means that we cannot solve identity without solving metaphysics (and the nature of time). Unlikely we'll solve this, before creating superintelligent AI. -/- Therefore, a conservative approach to personal identity is preferable: as we don't know the nature of identity, we should preserve as much as possible and avoid Mars Teleporting unless necessary for survival. We can solve the Mars Transporter (even broken) by incorporating mind merging later, which is another conservative approach. -/- We can solve the "I don't care about my copy" problem through indexical uncertainty and by dividing "copy" into "mirror copy", "personality-copy" and "future copy". If both cyclic universe and continuity as identity are true, I will eventually become any my copy. MWI is functionally equivalent to cyclic universe, so I will become any copy in different timesteps. Therefore, we should care about parallel copies only if future copies don't exist (though in MWI future copies always exist, plus the chance to become someone else). (shrink)

I introduce a new approach to fission puzzles called the Diversified Approach that proceeds by distinguishing different kinds of fission and assimilating each kind to a different ordinary phenomenon, such as breaking apart, replication, or part loss. To illustrate this approach, I apply it to the case of amoebic fission. The upshot is a novel account of amoebic fission according to which the dividing amoeba ceases to exist because it breaks apart. After developing this solution and highlighting some of its (...) advantages, I discuss briefly how the Diversified Approach can be extended to other varieties of fission. (shrink)

The Problem of Too Many Thinkers is the result, implied by several “permissive” ontologies, that we spatiotemporally overlap with a number of intrinsically person-like entities. The problem, as usually formulated, leaves open a much-neglected question: do we literally share our mental lives, i.e. each of our mental states, with these person-like entities, or do we instead enjoy mental lives that are qualitatively indistinguishable but numerically distinct from theirs? The latter option raises the worry that there is an additional Problem of (...) Too Many Mental Tokens. This paper argues that there is indeed such a problem, at least in fission cases. In the course of articulating this problem, we will make a number of surprising discoveries about the relationship between personal persistence and the metaphysics of mental entities. We will also see that the Problem of Too Many Mental Tokens has significant epistemological and ethical implications, which will haunt us even once we have addressed the Problem of Too Many Thinkers. (shrink)

Derek Parfit argues that fission is prudentially better for you than ordinary death. But is having more fission products with good lives prudentially better for you than having just one? In this paper, we argue that it is. We argue that, if your brain is split and the halves are transplanted into two recipients (who both have good lives), then it is prudentially better for you if both transplants succeed than if only one of them does (other things being equal). (...) This upshot rules out, among other things, that the prudential value of standing in the relation that matters in survival to multiple people is equal to their average well-being. (shrink)

According to a traditional conception, romantic love is both constant - if someone loves another, they continue to love them - and exclusive - if someone loves another, they love only the other. In this paper, we argue that the essentiality of constancy and exclusivity is incompatible with the possibilities of fission - roughly speaking, of one person becoming two - and fusion - roughly speaking, of two people becoming one. Moreover, if fission or fusion are possible, then constancy and (...) exclusivity are obligatory features of love only if there are moral dilemmas. We conclude by suggesting this casts doubt on the constancy and especially the exclusivity of love. (shrink)

This is an extension of my earlier work, How in the World Are There Many Worlds and it's a lot more interesting! This paper explores personal identity and persistence through time in the many-worlds framework, governed by the Many Worlds Interpretation (MWI) of quantum mechanics (QM). First, I will motivate our consideration of the MWI in this context. Second, I will introduce endurantism, which is one answer to the puzzle concerning persistence through time. Third, I will explain the foundational physics (...) underlying the MWI that lends itself to branching worlds. In turn, I will explain what exactly a world amounts to in this picture. Then, I will present three views on personal identity and persistence through time: the bye-bye Betty view, the every-branch view, and the privileged branch view. I will argue that the privileged branch view is the most attractive of the bunch for determining the best candidate among close continuers. Finally, I will discuss knowledge, attitudes, and moral responsibility within the privileged branch view. (shrink)

According to Longtermism, our acts’ expected influence on the expected value of the world is mainly determined by their effects in the far future. There is, given total utilitarianism, a straightforward argument for Longtermism due to the enormous number of people that might exist in the future, but this argument does not work on person-affecting views. In this paper, we will argue that these views might also lead to Longtermism if Prudential Longtermism is true. Prudential Longtermism holds for a person (...) if and only if our acts’ overall influence on that person’s expected well-being is mainly determined by the acts’ effects in the far future. We argue that (due to a small chance of anti-ageing and uploading) there could be an enormous amount of prudential value for some contemporary person in the far future and that value may be so large that it dominates their overall expectation of lifetime well-being. (shrink)

If we were to connect two individuals’ brains together, how would this affect the individuals’ conscious experiences? In particular, it is possible for two people to share any of their conscious experiences; to simultaneously enjoy some token experiences while remaining distinct subjects? The case of the Hogan twins—craniopagus conjoined twins whose brains are connected at the thalamus—seems to show that this can happen. I argue that while practical empirical methods cannot tell us directly whether or not the twins share conscious (...) experiences, considerations about the locality of content processing in the brain entails that they most likely do so. (shrink)

In der Diskussion um personale Identität nehmen die einflussreichen Arbeiten Derek Parfits eine Sonderstellung ein, insofern Parfit nicht bestrebt ist, eines der gängigen Identitätskriterien zu verteidigen, sondern vielmehr behauptet, dass unsere alltäglichen wie philosophischen Vorstellungen von personaler Identität unrettbar inkohärent sind und deshalb aufgegeben werden sollten. In seinem Beitrag beleuchtet Sascha Settegast die verschiedenen Argumente, die Parfit für diese provokante These vorbringt, und unternimmt insbesondere den Versuch einer systematischen Dekonstruktion der wichtigsten Gedankenexperimente Parfits, die zeigen soll, dass sich diese Gedankenexperimente (...) auf eine Weise auflösen lassen, die unsere alltäglichen Intuitionen über personale Identität intakt belässt. Settegast entwickelt dabei die Grundzüge einer Konzeption personaler Identität, die sich einerseits von den gängigen neo-lockeanischen und animalistischen Ansätzen abgrenzt und andererseits bewusst an den zeitgenössischen Neo-Aristotelismus in der Ethik anknüpft, wie er etwa bei Philippa Foot und Michael Thomp-son anzutreffen ist. Die diachrone numerische Identität menschlicher Personen gründet nach Settegasts Auffassung darin, dass der Verlauf ihres Lebens eine zeitliche Einheit aufweist, die dadurch bedingt ist, dass ihre Lebensführung die menschliche Lebensform auf eine individuell charakteristische Weise exemplifiziert. Insofern dies aber nur durch Kultivierung der Tugen-den zu erreichen ist, handelt es sich laut Settegast bei personaler Identität letztlich nicht um eine Tatsache, die einfach vorliegt oder nicht, sondern um eine Aufgabe, die uns als Menschen gegeben ist und wesentlich darin besteht, in bewusster Orientierung auf das gute Leben hin ein stabiles, sich zeitlich durchhaltendes Selbst allererst auszubilden. (shrink)

Jason Bowers and Meg Wallace have recently argued that those who hold that every individual instantiates a ‘haecceity’ are caught up in a Euthyphro-style dilemma when confronted with familiar cases of fission and fusion. Key to Bowers and Wallace’s dilemma are certain assumptions about the nature of metaphysical explanation and the explanatory commitments of belief in haecceities. However, I argue that the dilemma only arises due to a failure to distinguish between providing a metaphysical explanation of why a fact holds (...) vs. a metaphysical explanation of what it is for a fact to hold. In the process, I also shed light on the explanatory commitments of belief in haecceities. (shrink)

Given reductionism about people, personal persistence must fundamentally consist in some kind of impersonal continuity relation. Typically, these continuity relations can hold from one to many. And, if they can, the analysis of personal persistence must include a non-branching clause to avoid non-transitive identities or multiple occupancy. It is far from obvious, however, what form this clause should take. This paper argues that previous accounts are inadequate and develops a new proposal.

Lynne Baker's concept of a first-person perspective is not as clear and straightforward as it might seem at first glance. There is a discrepancy between her argumentation that we have first-person perspectives and some characteristics she takes first-person perspectives to have, namely, that the instances of this capacity necessarily persist through time and are indivisible and unduplicable. Moreover, these characteristics cause serious problems concerning personal identity.

Elizabeth Schechter explores the implications of the experience of people who have had the pathway between the two hemispheres of their brain severed, and argues that there are in fact two minds, subjects of experience, and intentional agents inside each split-brain human being: right and left. But each split-brain subject is still one of us.

Derek Parfit’s argument against the platitude that identity is what matters in survival does not work given his intended reading of the platitude, namely, that what matters in survival to some future time is being identical with someone who is alive at that time. I develop Parfit’s argument so that it works against the platitude on this intended reading.

In “The Argument for Subject Body Dualism from Transtemporal Identity Defended” (PPR 2013), Martine Nida-Rümelin (NR) responded to my (PPR 2013) criticism of her (2010) argument for subject-body dualism. The crucial premise of her (2010) argument was that there is a factual difference between the claims that in a fission case the original person is identical with one, or the other, of the successors. I argued that, on the three most plausible interpretations of ‘factual difference’, the argument fails. NR responds (...) that I missed the intended, fourth interpretation, and that, in any case, with an additional assumption, the argument on the third interpretation goes through. I argue that the fourth interpretation, while insufficient as stated, reveals an assumption that provides an independent argument, namely, that in first person thought about future properties we have a positive conception of the self that rules out having empirical criteria of transtemporal identity. I argue that the considerations offered for this thesis fail to establish it, and that we do not bring ourselves under any positive conception in first person thought. I argue also that on the third interpretation, the first premise of the argument is inconsistent with the necessity of identity. (shrink)

David Lewis defends the following "non-circular definition of personhood": "something is a continuant person if and only if it is a maximal R-interrelated aggregate of person-stages. That is: if and only if it is an aggregate of person-stages, each of which is R-related to all the rest (and to itself), and it is a proper part of no other such aggregate." I give a counterexample, involving a person who is a part of another, much larger person, with a separate mental (...) life. I then offer an easy repair, which preserves the virtues of Lewis's definition without introducing any new vices. (shrink)

When one considers one's own persistence over time from the first-person perspective, it seems as if facts about one's persistence are "further facts," over and above facts about physical and psychological continuity. But the idea that facts about one's persistence are further facts is objectionable on independent theoretical grounds: it conflicts with physicalism and requires us to posit hidden facts about our persistence. This essay shows how to resolve this conflict using the idea that imagining from the first-person point of (...) view is a guide to centered possibility, a type of possibility analyzed in terms of centered worlds. (shrink)

It seems plausible that (i) how much punishment a person deserves cannot be affected by the mere existence or nonexistence of another person. We might have also thought that (ii) how much punishment is deserved cannot increase merely in virtue of personal division. I argue that (i) and (ii) are inconsistent with the popular belief that, other things being equal, when people culpably do very wrong or bad acts, they ought to be punished for this—even if they have repented, are (...) now virtuous, and punishing them would benefit no one. Insofar as we cannot deny (i), we are either forced to abandon the popular belief in desert, or else allow that personal division could, as I put it, “multiply desert.” Some may not find the latter, considered by itself, troubling. But I argue that the thesis that division multiplies desert faces a potentially serious problem, which arises in the context of personal fusion. It is difficult to see how to maintain a particular family of desert views in light of the cases here presented. (shrink)

Martine Nida-Rümelin has argued recently for subject-body dualism on the basis of reflections on the possibility of survival in fission cases from the literature on personal identity. The argument focuses on the claim that there is a factual difference between the claims that one or the other of two equally good continuers of a person in a fission case is identical with her. I consider three interpretations of the notion of a factual difference that the argument employs, and I argue (...) that on each of them the argument either begs the question or is unsound. (shrink)

Abstract: Those who endorse the Psychological Continuity Approach (PCA) to analyzing personal identity need to impose a non-branching constraint to get the intuitively correct result that in the case of fission, one person becomes two. With the help of Brueckner's (2005) discussion, it is shown here that the sort of non-branching clause that allows proponents of PCA to provide sufficient conditions for being the same person actually runs contrary to the very spirit of their theory. The problem is first presented (...) in connection with perdurantist versions of PCA. The difficulty is then shown to apply to endurantist versions as well. -/- . (shrink)

Recent work in personal identity has emphasized the importance of various conventions, or ‘person-directed practices’ in the determination of personal identity. An interesting question arises as to whether we should think that there are any entities that have, in some interesting sense, conventional identity conditions. We think that the best way to understand such work about practices and conventions is the strongest and most radical. If these considerations are correct, persons are, on our view, conventional constructs: they are in part (...) constituted by certain conventions. A person exists only if the relevant conventions exist. A person will be a conscious being of a certain kind combined with a set of conventions. Some of those conventions are encoded in the being itself, so requiring the conventions to exist is requiring the conscious being to be organized in a particular way. In most cases the conventions in question are settled. There is no dispute about what the conventions are, and thus no dispute about which events a person can survive. These are cases where we take the conventions so much for granted, that it is easy to forget that they are there, and that they are necessary constituents of persons. Sometimes though, conventions are not settled. Sometimes there is a dispute about what the conventions should be, and thus a dispute about what events a person can survive. These are the traditional puzzle cases of personal identity. That it appears that conventions play a part in determining persons’ persistence conditions only in these puzzle cases is explained by the fact that only in these cases are the conventions unsettled. Settled or not though, conventions are necessary constituents of persons. (shrink)

In this paper, I argue that standard psychological continuity theory does not account for an important feature of what is important in survival – having the property of personhood. I offer a theory that can account for this, and I explain how it avoids the implausible consequences of standard psychological continuity theory, as well as having certain other advantages over that theory.

This is a critical review of Raymond Martin's 'Self-Concern'(1998).

(No abstract is available for this citation).

Parfit’s well known book, Reasons and Persons, argues, among other things, that ‘what matters’ in regard to ‘survival’ is not personal identity but something he calls ‘relation R.’ On this basis, plus other considerations, he rejects the ‘Self-interest’ theory as to what should be our aim in life. Here I show, or try to show, that his over-all argument is seriously defective. In particular, he fails to prove that personal identity is not what matters for survival.

According to conventional wisdom, the split-brain syndrome puts paid to the thesis that consciousness is necessarily unified. The aim of this paper is to challenge that view. I argue both that disunity models of the split-brain are highly problematic, and that there is much to recommend a model of the split-brain—the switch model—according to which split-brain patients retain a fully unified consciousness at all times. Although the task of examining the unity of consciousness through the lens of the split-brain syndrome (...) is not a new one—such projects date back to Nagel’s seminal paper on the topic—the time is ripe for a re-evaluation of the issues. (shrink)

In consciousness studies, the first-person perspective, seen as a way to approach consciousness, is often seen as nothing but a variant of the third-person perspective. One of the most important advocates of this view is Dennett. However, as I show in critical interaction with Dennett’s view, the first-person perspective and the third-person perspective are different ways of asking questions about themes. What these questions are is determined by the purposes that we have when we ask them. Since our purposes are (...) different according to the perspective we take, each perspective has a set of leading questions of its own. This makes that the first-person perspective is an approach of consciousness that is substantially different from the third-person perspective, and that one cannot be reduced to the other. These perspectives are independent, although complementary approaches of the mind. (shrink)

Imagine that you and a duplicate of yourself are lying unconscious, next to each other, about to undergo a complete step-by-step exchange of bits of your bodies. It certainly seems that at no stage in this exchange of bits will you have thereby switched places with your duplicate. Yet it also seems that the end-result, with all the bits exchanged, will be essentially that of the two of you having switched places. Where will you awaken? I claim that one and (...) the same person possesses both bodies, occupies both places and will experience both awakenings, just as a person whose brain has been bisected must at once experience both of the unconnected fields of awareness, even though each of these will falsely appear to him as the entirety of his experience. I also claim that the more usual apparent boundaries of persons are as illusory as those in brain bisection; personal identity remains unchanged through any variation or multiplication of body or mind. In all conscious life there is only one person - I - whose existence depends merely on the presence of a quality that is inherent in all experience - its quality of being mine, the simple immediacy of it for whatever is having experience. One powerful argument for this is statistical: on the ordinary view of personhood it is an incredible coincidence for you (though not for others) that out of 200,000,000 sperm cells the very one required on each occasion for your future existence was first to the egg in each of the begettings of yourself and all your ancestors. The only view that does not make your existence incredible, and that is not therefore (from your perspective) an incredible view, is that any conscious being would necessarily have been you anyway. It is a consequence that self-interest should extend to all conscious organisms. (shrink)

We need to understand personal identity to develop radical life extension technologies: mind uploading, cryonics, digital immortality, and quantum (big world) immortality. A tentative solution is needed now, due to the opportunity cost of delaying indirect digital immortality and cryonics. However, solving the problem of personal identity is not easy. Human personal identity is a complex thing, not similar to other types of identity, such as that of Theseus ship. First of all, human identity consists of two intertwined types of (...) identity: informational identity, which predicts sameness, and identity of consciousness, which predicts what I will experience in the next moment of time. The identity of consciousness is called "hard problem of identity", and it is because it supervenes on the nature of consciousness. The second feature of human personal identity is that it is observed and measured internally, by identity subject himself. The third is that it evolves in time. -/- The main dichotomy in the views on personal identity and copies can be presented as: either my copy=original or a soul exists. In other words, some non-informational identity carrier (NIIC) may exist that distinguishes the original from its exact copy. Typically, it is often claimed that NIIC is either continuity of consciousness, or soul, or perspective, or the sameness of atoms, or position in space. We create an exhaustive map of identity theories. -/- We demonstrate here that the idea of continuity of consciousness is very similar to the idea of soul, but also has several problems: - Is it the continuity of qualia, of causal processes, of computations or of underlying substrate? - We also show that continuity doesn't prevent the emergence of two future copies if they split smoothly, so continuity does not preserve identity as uniqueness. - Also, continuity doesn't ensure uniqueness as I can continually become someone else. - Continuity + MWI means that I will eventually become anyone, that is, open individualism. - Continuity also can be paradoxically preserved without preserving body and mind as a separate process like flame. - Humans also seems to survive discontinuity during sleep without problems. Nevertheless, continuity appears to be inherent to qualia, emerging after observation but before action, and in planning. Only if continuity of consciousness is an ontological necessity, it can be a valid NIIC, but this is true only in a specific version of solipsism (qualia dust theory). In that case, a specific set of personal qualia becomes the personality carrier. -/- If copy=original then even imperfect copies suffice for personal immortality, as self-recognition becomes the main criterion of identity. -/- Open and closed individualism deny the existence of identity but must reinvent it as "practical identity" and therefore revert to copy=original. -/- To resolve the main dichotomy, we must recognize that personal identity requires an overarching system: God, qualia world, social agreement, or evolutionary fitness. This means that we cannot solve identity without solving metaphysics (and the nature of time). Unlikely we'll solve this, before creating superintelligent AI. -/- Therefore, a conservative approach to personal identity is preferable: as we don't know the nature of identity, we should preserve as much as possible and avoid Mars Teleporting unless necessary for survival. We can solve the Mars Transporter (even broken) by incorporating mind merging later, which is another conservative approach. -/- We can solve the "I don't care about my copy" problem through indexical uncertainty and by dividing "copy" into "mirror copy", "personality-copy" and "future copy". If both cyclic universe and continuity as identity are true, I will eventually become any my copy. MWI is functionally equivalent to cyclic universe, so I will become any copy in different timesteps. Therefore, we should care about parallel copies only if future copies don't exist (though in MWI future copies always exist, plus the chance to become someone else). (shrink)

Schopenhauer repeatedly claims that suicide is both foolish and futile. But while many commentators have expressed sympathy for his charge of foolishness, most regard his charge of futility as indefensible even within his own system. In this paper, I offer a defense of Schopenhauer’s futility charge, based on metaphysical and psychological considerations. On the metaphysical front, Schopenhauer’s view implies that psychological connections extend beyond death. Drawing on Parfit’s discussion of personal identity, I argue that those connections have personal significance, such (...) that suicide does not allow one, as Hamlet hopes, simply “not to be.” On the psychological front, I argue that a distinction between agents’ intentions and underlying desires makes room for Schopenhauer to claim that paradigmatic suicidal agents ultimately desire the opposite of what suicide accomplishes. I conclude by showing how the resulting account of futility can buttress the charge of foolishness as well. My interpretation still leaves Schopenhauer vulnerable to certain objections, but shows that his account is significantly more defensible than previous commentators have realized. (shrink)

Sideloading is the creation of a digital model of a person during their life via iterative improvements of this model based on the person's feedback. The progress of LLMs with large prompts allows the creation of very large, book-size prompts which describe a personality. We will call mind-models created via sideloading "sideloads"; they often look like chatbots, but they are more than that as they have other output channels, like internal thought streams and descriptions of actions. -/- By arranging the (...) predictive power of the facts about a person, we can write down the most important facts first. This allows us to get a high level of fidelity in a person's model by writing down a finite number of facts and running it as an LLM prompt with instructions to create a person's chatbot. This instruction also includes an extensive general sideload prompt (we will call it a prompt-loader), which explains how the person's sideload should work, but it is universal and works as an operating system for different persons. -/- I created my personal sideload to test all this and it started working surprisingly quickly. We found that there are three main levels of facts about a person: core facts, long-term memory, and historical facts. Core facts should go to the main prompt of the LLM, long-term memory belongs to RAG, and historical facts – which a person often does not remember – should be only used to extract new relevant data. The most important thing in preparing data for sideloading is to get a full list of the core facts, and not to mix it with long-term memory and historical facts. The LLM-sideload project is inherently future-oriented. New state-of-the-art LLMs with large prompt capabilities emerge quarterly. This allows for the preparation of prompts that exceed current LLM capabilities, anticipating smooth execution in the following year. Below we present the key findings of this work in the form of an executive summary: Quality of sideloads is evaluated using three metrics: • Facts: Accuracy of the answers about the person's life • Vibe: How well the sideload captures the person's style and personality, as judged by the person themselves and their acquaintances • Brilliant insights: Ability to contribute unique, valuable ideas beyond the training data, while maintaining the author's style • Coarseness: Levels of details as percent of the total of recordable textual information from memory estimated to be 10000 pages. Similar to the jpeg level of compression. Estimated performance of Alexey Turchin's sideload: • Facts: 70% correct • Vibe: 20% accurate • Brilliant insights: near zero • Coarseness: 10% The project achieved these results in about one month of work. Vibe is harder to evaluate and regulate than facts. This approach focuses on informational personal identity, setting aside issues of observer identity and internal qualia. (shrink)