This work addresses the critical discussion featured in the contemporary literature about two well-known paradoxes belonging to different philosophical traditions, namely Frege’s puzzling claim that “the concept horse is not a concept” and Gongsun Long’s “white horse is not horse”. We first present the source of Frege’s paradox and its different interpretations, which span from plain rejection to critical analysis, to conclude with a more general view of the role of philosophy as a fight against the misunderstandings that come from (...) the different uses of language (a point later developed by the “second” Wittgenstein). We then provide an overview of the ongoing discussions related to the Bai Ma Lun paradox, and we show that its major interpretations include—as in the case of Frege’s paradox—dismissive accounts that regard it as either useless or wrong, as well as attempts to interpret and repair the argument. Resting on our reading of Frege’s paradox as an example of the inescapability of language misunderstandings, we advance a similar line of interpretation for the paradox in the Bai Ma Lun: both the paradoxes, we suggest, can be regarded as different manifestations of similar concerns about language, and specifically about the difficulty of referring to concepts via language. (shrink)

: The Emotional Perception Model of moral judgment intends to account for experientialism about morality and moral reasoning. In explaining how moral beliefs are formed and applied in practical reasoning, the model attempts to overcome the mismatch between reason and action/desire: morality isn’t about reason for actions, yet moral beliefs, if caused by desires, may play a motivational role in agency. The account allows for two kinds of moral beliefs: genuine moral beliefs, which enjoy a relation to desire, and motivationally (...) inert moral beliefs acquired in ways other than experience. Such etiology-based dichotomy of concepts, I will argue, leads to the undesirable view of cognition as a non-homogeneous phenomenon. Moreover, the distinction between moral beliefs and moral beliefs would entail a further dichotomy encompassing the domain of moral agency: one and the same action might possibly be either genuine moral, or not moral, if acted by individuals lacking the capacity for moral feelings, such as psychopaths. Keywords : Moral Beliefs; Cognitive Homogeneity; Moral Agency; Motivation; Psychopathy Credenze morali e omogeneità cognitiva Riassunto : L’ Emotional Perception Model del giudizio morale offre un approccio esperienzialista alla moralità e al ragionamento morale. Il modello, che propone una spiegazione di come le credenze morali vengano prima formate e poi applicate, intende superare il disallineamento tra ragione e azione/desiderio: la moralità non riguarda le ragioni per agire, tuttavia le credenze morali, se causate dal desiderio o in relazione con esso, svolgono un ruolo motivazionale nell’azione. Questo approccio consente di identificare due tipi di credenza morale: le credenze morali genuine, che trattengono una relazione con il desiderio, e le credenze morali senza relazione alcuna con il desiderio e dunque caratterizzate da inerzia motivazionale. Tale tassonomia, la cui origine è da rintracciare nell’eziologia dei concetti, porta alla sgradita visione della cognizione come fenomeno disomogeneo. Inoltre la distinzione tra credenze morali e credenze morali introdurrebbe una ulteriore possibile dicotomia interna al dominio dell’azione morale: una medesima azione può essere al contempo genuinamente morale oppure no, a seconda che venga agita da un individuo con la capacità di esperire sentimenti morali o da uno che ne sia privo, come nel caso di soggetti psicopatici. Parole chiave : Credenze morali; Omogeneità cognitiva; Agentività morale; Motivazione; Psicopatia. (shrink)

According to David Lewis, the predicate ‘knows’ is context-sensitive in the sense that its truth conditions vary across conversational contexts, which stretch or compress the domain of error possibilities to be eliminated by the subject’s evidence. Our concern in this paper is to thematize, assess, and overcome within a neo-Lewisian contextualist project two important mismatches between our use of ‘know’ in ordinary life and the use of ‘know’ by ‘Lewisian’ ordinary speakers. The first mismatch is that Lewisian contextualism still overgenerates (...) the error possibilities which cannot be ignored in a given context, since it is oblivious to the distinction between ‘invented’ and ‘discovered’ possibilities. The second mismatch is a full-scale one: an adequate account of knowledge attribution is not exhausted by the subject’s negative capacity of pruning branches off the tree of counterpossibilities. We therefore introduce a new vector of value, which explains how ‘know’ comes in degrees: the satisfaction of ‘know better’ is made to depend on the capacity of imagining possibilities connected in a relevant way with the subject’s beliefs. (shrink)

: Traditional accounts regard the first-person pronoun as a special token-reflexive indexical whose referent, the utterer, is identified by the linguistic rule expressed by the term plus the context of utterance. This view falls short in accounting for all the I-uses in narrative practices, a domain broader than fiction including storytelling, pretense, direct speech reports, delayed communication, the historical present, and any other linguistic act in which the referent of the indexical is not perceptually accessible to the receiver. I propose (...) a model for the reference of “I” based on the distinction between three functions carried out by indexicals in communication, namely, the anaphoric, perceptual, and phantasmatic functions. The referential mechanism of the phantasmatic “I”, that is, the “I” used in phantasmatic function, is understood as an instance of imagination-oriented pointing exploiting the phantasmatic context, and not the perceptual context relevant in perceptual uses of indexicals. The rule for “I” is revised in light of the perceptual vs. phantasmatic deixis distinction; the resulting rule governing the reference of the phantasmatic “I” allows for a homogeneous treatment of ‘I’-tokens in narrative practices spanning the spectrum from fiction to non-fiction. Keywords : First-person Pronoun; Context; Imagination; Fiction; Indexicals; Narration; L'io fantasmatico. Sull’uso immaginativo del pronome di prima persona tra finzione e realtà Riassunto : Tradizionalmente “io” viene trattato come un indicale token-riflessivo speciale il cui referente, il produttore dell’occorrenza, è identificato attraverso la sola regola linguistica e il contesto di proferimento. Questo approccio, tuttavia, non riesce a rendere conto di quei casi in cui “io” appare all’interno di pratiche di narrazione, un dominio più ampio della finzione e che include lo storytelling, i racconti in discorso diretto e indiretto, la comunicazione differita, il presente storico e ogni altro atto linguistico in cui il referente indicale non è percettivamente accessibile al ricevente. Il modello per il riferimento di “io” qui proposto si basa sulla distinzione tra tre funzioni svolte dagli indicali nella comunicazione: la funzione anaforica, la funzione percettiva, e la funzione fantasmatica. Il meccanismo referenziale dell’io fantasmatico, ovvero del pronome di prima persona usato in funzione fantasmatica, è inteso come una istanza di deissi orientata dall’immaginazione che sfrutta il contesto fantasmatico, piuttosto che il contesto percettivo rilevante negli usi percettivi degli indicali. La regola per “io” è riformulata alla luce della distinzione tra deissi fantasmatica e deissi percettiva; la risultante regola per il riferimento indicale dell’io fantasmatico permette un trattamento omogeneo delle occorrenze di “io” nelle pratiche di narrazione che pertengono indistintamente alla finzione e alla realtà. Parole chiave : Pronome di prima persona; Contesto; Immaginazione; Finzione; Indicali; Narrazione. (shrink)

This paper focuses on Hector-Neri Castañeda's significant contributions to metaphilosophy. In his 1980 work, On Philosophical Method, Castañeda articulates a unique perspective, characterizing philosophy as fundamentally a dia-philosophical activity. By asserting the supremacy of synthesis over analysis within the metaphilosophical hierarchy, his account provides a purely theoretical defense of philosophical pluralism devoid of any relativistic inclinations. Despite Castañeda's enduring influence and profound impact on ongoing discussions in ontology, logic, and the philosophy of language, his metaphilosophical insights have largely been neglected. (...) In the context of today's increasingly diverse philosophical landscape, this paper posits that Castañeda's pluralist metaphilosophy retains substantial theoretical relevance. (shrink)

It seems that fearing the death and believing in an almost endless cycle of rebirths is a paradox, but in India it is an actual attitude of the majority of religious local creeds. The painful ways in which death happens, the frightening netherworld in which the dead must be punished, the sad missing of one’s family and friends, the uncertainty of the new form in which the imperishable soul (ātman) might dwell in its new life, all these are the basic (...) elements of such a fear. Therefore the solution can be seen only in nirvāṇa, i.e. to be extinguished or not to go any longer. (shrink)

The advent of experimental philosophy has recently expanded the domain of philosophical debates so as to include discussions about survey-based methodology and the validity of its employment in philosophical inquiry. One of the main criticisms of this approach questions the alleged response-intuition equation, by claiming that ‘pragmatic cues’ might prevent the subjects from reporting their genuine intuitions about the survey scenarios and questions. The pragmatic cues discussed by the literature include aspects of a quite different nature, ranging from thinking-styles to (...) semantic ambiguities. In order to distinguish between language-related pragmatic cues, and other features not strictly dependent on language, the distinction between the ‘response problem’ and the ‘interpretation problem’—potentially triggered by language-related pragmatic cues—is introduced. By employing an illustrated survey, this study aims at revealing the extent to which the use of ‘non-linguistic’ vignettes might constitute a valid aid to the traditional ‘linguistic’ vignette. A positive response would encourage the usage of illustrations and other non-linguistic or minimally-linguistic models in survey-based studies, which considerably restricts the liability of surveys for the interpretation problem. (shrink)

After the recent “cognitive turn” it is commonly assumed that the domain of the cognitive is much broader than the domain of the linguistic. Consequently, the quickly decreasing appeal of “linguistic idealism” is now totally clouded by the view that language is not necessary for thought. I here highlight how the target paper is fully attuned to this mainstream view, which originally and fundamentally rejects any linguistic idealist claim. Furthermore, I propose a new formulation of an “old” methodological concern about (...) psychological explanations, which potentially challenges the efficacy of any argumentative strategy hinging on higher order cognitive capacities. (shrink)

Not only do we enjoy the company of fictional characters (such as Emma Bovary, Pinocchio, and the like) as we read a novel, watch a movie, or listen to a story ; but we also become emotionally involved with them and their adventures. This interaction with fiction constitutes the starting point of the ongoing philosophical debate on the ontological and metaphysical status of fictional objects, and challenges with various problems the theories of fiction currently found on the market. A survey (...) of these problems is offered in this contribution. (shrink)

In contemporary philosophy and psychology there is an ongoing debate about Theory of Mind , which mainly concerns our ability to understand other people. For almost two decades, authors have argued in favour of a crucial relationship between language and children's development of ToM. Studies based on verbal tasks suggest that children possess a ToM not earlier than about the age of four. Nevertheless, in recent years, this paradigm has been almost replaced by a 'new' nativist paradigm conceiving of mental (...) capacities as part of our purely biological inheritance. In contrast with the traditional tasks, non-verbal task results indicate that children possess ToM at the age of 15 months, or earlier. The contradictory data led to the so-called 'developmental gap': how is it that 15-month-olds already possess ToM, while failing the traditional tasks until the age of four? My thesis is that the data at our disposal, if interpreted in the light of a suitable theoretical framework, do not generate a genuine contradiction. Prior to the interpretation of the research results, a distinction between epistemological and metaphysical levels of investigation, and a clear analysis of notions such as 'representation', 'inference', 'mental state', and the like, is required. (shrink)

Many of the computing systems programmed using Machine Learning are opaque: it is difficult to know why they do what they do or how they work. Explainable Artificial Intelligence aims to develop analytic techniques that render opaque computing systems transparent, but lacks a normative framework with which to evaluate these techniques’ explanatory successes. The aim of the present discussion is to develop such a framework, paying particular attention to different stakeholders’ distinct explanatory requirements. Building on an analysis of “opacity” from (...) philosophy of science, this framework is modeled after accounts of explanation in cognitive science. The framework distinguishes between the explanation-seeking questions that are likely to be asked by different stakeholders, and specifies the general ways in which these questions should be answered so as to allow these stakeholders to perform their roles in the Machine Learning ecosystem. By applying the normative framework to recently developed techniques such as input heatmapping, feature-detector visualization, and diagnostic classification, it is possible to determine whether and to what extent techniques from Explainable Artificial Intelligence can be used to render opaque computing systems transparent and, thus, whether they can be used to solve the Black Box Problem. (shrink)

To date, no definition of life has been unequivocally accepted by the scientific community. In frustration, some authors advocate alternatives to standard definitions. These include using a list of characteristic features, focusing on life’s effects, or categorizing biospheres rather than life itself; treating life as a fuzzy category, a process or a cluster of contingent properties; or advocating a ‘wait-and-see’ approach until other examples of life are created or discovered. But these skeptical, operational, and pluralistic approaches have intensified the debate, (...) rather than settled it. Given the failure of even these approaches, we advocate a new strategy. In this paper, we reverse the usual line of reasoning and argue that the “life problem” arises from thinking incorrectly about the nature of life. Scientists most often conceptualize life as a class or kind, with earthly life as a single instance of it. Instead, we advocate thinking about Earth’s Life as an individual, in the way that species are now thought to be. In this view, Life is a monophyletic clade that originated with a last universal common ancestor, and includes all its descendants. We can continue to use the category ‘life’ pragmatically to refer to similarities between various phenomena and Life. But the relevant similarities are a matter of interest and preference, not a matter of fact. The search for other life in the Universe, then, is merely a search for entities that resemble parts of Life in whatever sense astrobiologists find most appealing. This does not mean that the search for evolved complexity elsewhere in the universe or its creation in the lab are futile endeavors, but that debates over whether they count as ‘life’ are. Ironically, finally abandoning the concept ‘life’ may make our searches for evolved complexity more fruitful. We explain why. (shrink)

The received view of dynamical explanation is that dynamical cognitive science seeks to provide covering law explanations of cognitive phenomena. By analyzing three prominent examples of dynamicist research, I show that the received view is misleading: some dynamical explanations are mechanistic explanations, and in this way resemble computational and connectionist explanations. Interestingly, these dynamical explanations invoke the mathematical framework of dynamical systems theory to describe mechanisms far more complex and distributed than the ones typically considered by philosophers. Therefore, contemporary dynamicist (...) research reveals the need for a more sophisticated account of mechanistic explanation. (shrink)

Models developed using machine learning are increasingly prevalent in scientific research. At the same time, these models are notoriously opaque. Explainable AI aims to mitigate the impact of opacity by rendering opaque models transparent. More than being just the solution to a problem, however, Explainable AI can also play an invaluable role in scientific exploration. This paper describes how post-hoc analytic techniques from Explainable AI can be used to refine target phenomena in medical science, to identify starting points for future (...) investigations of causal relationships, and to generate possible explanations of target phenomena in cognitive science. In this way, this paper describes how Explainable AI—over and above machine learning itself—contributes to the efficiency and scope of data-driven scientific research. (shrink)

"Epistola a Memeceo, Maximas capitales, Sentencias vaticanas, fragmentos y testimonios; texto griego y traduccion": p. [87]-161.

This paper discusses the varieties of capitalism in transitional societies in Latin America and Central / Eastern Europe. The intended purpose of these transitions from semi-closed import-substituting economies in the first case and state socialist ones in the second was to institutionalize open-market economies. Twenty or thirty years later, there is a variety of types of capitalism in these countries, which I classify into three: open-market, neo-mercantilist, and anemic. The question for sociology is whether these quite different variants represent temporary (...) stages or distortions in the same process of transition or whether, on the contrary, they may institutionalize as discrete forms of peripheral capitalism. Neither standard “legacy” argu­ments nor institutionalist theories offer satisfactory answers to this question. The multiple modernities approach, on the other hand, is more appropriate as a theoretical perspective, but it has not produced yet specific propositions applicable to this question. My paper makes two claims. First, the successful transfer of institutions depends on the congruence between these institutions and the broader institutional framework of the recipient economies, a point not developed by institutionalist theories. I offer a hypothesis in this regard: Two critical nodes of congruence are the regulatory and extractive capacity of the state and the strength of civil society. Second, market capitalism (as liberal democracy as well) is a complex institution, and some of its components “travel” more easily across societies and institutional frameworks, and therefore are easier to institutionalize. This is the source of the hybrid variants. (shrink)

At least since Kuhn’s Structure, philosophers have studied the influence of social factors in science’s pursuit of truth and knowledge. More recently, formal models and computer simulations have allowed philosophers of science and social epistemologists to dig deeper into the detailed dynamics of scientific research and experimentation, and to develop very seemingly realistic models of the social organization of science. These models purport to be predictive of the optimal allocations of factors, such as diversity of methods used in science, size (...) of groups, and communication channels among researchers. In this paper we argue that the current research faces an empirical challenge. The challenge is to connect simulation models with data. We present possible scenarios about how the challenge may unfold. (shrink)

Bayesian reverse-engineering is a research strategy for developing three-level explanations of behavior and cognition. Starting from a computational-level analysis of behavior and cognition as optimal probabilistic inference, Bayesian reverse-engineers apply numerous tweaks and heuristics to formulate testable hypotheses at the algorithmic and implementational levels. In so doing, they exploit recent technological advances in Bayesian artificial intelligence, machine learning, and statistics, but also consider established principles from cognitive psychology and neuroscience. Although these tweaks and heuristics are highly pragmatic in character and (...) are often deployed unsystematically, Bayesian reverse-engineering avoids several important worries that have been raised about the explanatory credentials of Bayesian cognitive science: the worry that the lower levels of analysis are being ignored altogether; the challenge that the mathematical models being developed are unfalsifiable; and the charge that the terms ‘optimal’ and ‘rational’ have lost their customary normative force. But while Bayesian reverse-engineering is therefore a viable and productive research strategy, it is also no fool-proof recipe for explanatory success. (shrink)

This article discusses the relation between empirical and normative approaches in bioethics. The issue of dwarf tossing, while admittedly unusual, is chosen as a point of departure because it challenges the reader to look with fresh eyes upon several central bioethical themes, including human dignity, autonomy, and the protection of vulnerable people. After an overview of current approaches to the integration of empirical and normative ethics, we consider five ways that the empirical and normative can be brought together to speak (...) to the problem of dwarf tossing: prescriptive applied ethics, theoretical ethics, critical applied ethics, particularist ethics and integrated empirical ethics. We defend a position of critical applied ethics that allows for a two-way relation between empirical and normative theories. Against efforts fully to integrate the normative and the empirical into one synthesis, we propose that the two should stand in tension and relation to one another. The approach we endorse acknowledges that a social practice can and should be judged both by the gathering of empirical data and by normative ethics. Critical applied ethics uses a five stage process that includes: (a) determination of the problem, (b) description of the problem, (c) empirical study of effects and alternatives, (d) normative weighing and (e) evaluation of the effects of a decision. In each stage, we explore the perspective from both the empirical (sociological) and the normative ethical point of view. We conclude by applying our five-stage critical applied ethics to the example of dwarf tossing. (shrink)

The philosophical conception of mechanistic explanation is grounded on a limited number of canonical examples. These examples provide an overly narrow view of contemporary scientific practice, because they do not reflect the extent to which the heuristic strategies and descriptive practices that contribute to mechanistic explanation have evolved beyond the well-known methods of decomposition, localization, and pictorial representation. Recent examples from evolutionary robotics and network approaches to biology and neuroscience demonstrate the increasingly important role played by computer simulations and mathematical (...) representations in the epistemic practices of mechanism discovery and mechanism description. These examples also indicate that the scope of mechanistic explanation must be re-examined: With new and increasingly powerful methods of discovery and description comes the possibility of describing mechanisms far more complex than traditionally assumed. (shrink)

Our understanding of the universe has grown rapidly in recent decades. We’ve discovered evidence of water in nearby planets, discovered planets outside our solar system, mapped the genomes of thousands of organisms, and probed the very origins and limits of life. The scientific perspective of life-as-it-could-be has expanded in part by research in astrobiology, synthetic biology, and artificial life. In the face of such scientific developments, we argue there is an ever-growing need for universal biology, life-as-it-must-be, the multidisciplinary study of (...) non-contingent aspects of life as guided by biological theory and constrained by the universe. We present three distinct but connected ways of universalizing biology—with respect to characterizing aspects of life everywhere, with respect to the explanatory scope of biological theory, and with respect to extending biological insights to the structure of nonbiological entities. For each of these, we sketch the theoretical goals and challenges, as well as give examples of current research that might be labeled universal biology. (shrink)

This chapter subsumes David Marr’s levels of analysis account of explanation in cognitive science under the framework of mechanistic explanation: Answering the questions that define each one of Marr’s three levels is tantamount to describing the component parts and operations of mechanisms, as well as their organization, behavior, and environmental context. By explicating these questions and showing how they are answered in several different cognitive science research programs, this chapter resolves some of the ambiguities that remain in Marr’s account, and (...) shows that many different areas and traditions of cognitive scientific research can be unified under the mechanistic framework. (shrink)

The concept of dignity is notoriously vague. In this paper it is argued that the reason for this is that there are three versions of dignity that are often confused. First we will take a short look at the history of the concept of dignity in order to demonstrate how already from Roman Antiquity two versions of dignity can be distinguished. Subsequently, the third version will be introduced and it will be argued that although the three versions of dignity hang (...) together, they should also be clearly distinguished in order to avoid confusion. The reason for distinguishing the three versions is because all three of them are only partially effective. This will be demonstrated by taking the discussion about voluntary ‘dying with dignity’ as an example. Inspired by both Paul Ricoeur’s concept of ethics and the ethics of care a proposition will be done as to how the three versions of dignity may sustain each other and help achieve what neither one of the versions can do on its own. (shrink)

The concept of evidence has gone unanalysed in much of the current debate between proponents and critics of evidence-based medicine. In this paper I will suggest that part of the controversy rests on an understanding of the word “evidence” that is too broad, and therefore contains the contradictions that allow both camps to defend their position and charge their adversaries. I will argue that reconciling the different meanings of the word ‘evidence’ in “evidence-based medicine” should help put EBM in its (...) rightful place. (shrink)

Whereas most branches of neuroscience are thought to provide mechanistic explanations, systems neuroscience is not. Two reasons are traditionally cited in support of this conclusion. First, systems neuroscientists rarely, if ever, rely on the dual strategies of decomposition and localization. Second, they typically emphasize organizational properties over the properties of individual components. In this paper, I argue that neither reason is conclusive: researchers might rely on alternative strategies for mechanism discovery, and focusing on organization is often appropriate and consistent with (...) the norms of mechanistic explanation. Thus, many explanations in systems neuroscience can also be viewed as mechanistic explanations. (shrink)

In a context of pervasive digitalization of the social world, both before and during the COVID-19 pandemic, the field of education has undergone major changes with the development of digital practices and settings. However, the physical presence of the subjects and the body remain something primordial and irreplaceable in traditional educational processes. Thus, it is often assumed that virtuality is opposed to the corporeal reality of the subjects involved in teaching, learning and studying. In this paper we aim to critically (...) challenge this assumption by addressing the phenomenon of virtuality in a more original sense: as a fundamental dimension of corporeality itself. Drawing on Merleau-Ponty’s phenomenological insights, we argue that the experience of the virtual is inherently embodied and fully real. We understand corporeality and virtuality as entangled and multidimensional phenomena. At the same time, this leads us to rethink the digital as only one possible medium in which virtuality can appear as inherent to embodied experience. We develop our phenomenological approach in three instances. First, we question and bracket two common assumptions about corporeality. From our critical perspective, assumptions about a disembodied digitality and a devirtualized corporeality represent extremes within which educational discourses currently move. Second, we address the inherent virtuality of embodied experience. We outline the heuristic concept of the virtual body to describe corporeality and virtuality as entangled and multidimensional phenomena that encompass extension, intercorporeality and intermediality. Finally, we make some remarks on the relationships of corporeality and virtuality considering the challenges of digital education. (shrink)

The so-called “intentional object” occupies a central position in the debates about intentionality in Brentano and the Brentano School. How does it relate to the correlate, the content, or the intended, possibly external, transcendent object? Does it perhaps even coincide with one of these? There was no clear consensus on this neither in Brentano’s time nor today. In order to develop a new perspective on the problem of the intentional object, I would like to introduce a deliberately radical interpretation and (...) related terminological change: what if we were to avoid any talk of “object” in this context altogether? Perhaps this could help avoid the ambiguities and misunderstandings associated with talk of “intentional objects.” In my contribution I would like to sketch such an interpretation and consider whether this attempt could be useful to reframe the debate. (shrink)

This paper considers the way mathematical and computational models are used in network neuroscience to deliver mechanistic explanations. Two case studies are considered: Recent work on klinotaxis by Caenorhabditis elegans, and a longstanding research effort on the network basis of schizophrenia in humans. These case studies illustrate the various ways in which network, simulation and dynamical models contribute to the aim of representing and understanding network mechanisms in the brain, and thus, of delivering mechanistic explanations. After outlining this mechanistic construal (...) of network neuroscience, two concerns are addressed. In response to the concern that functional network models are non-explanatory, it is argued that functional network models are in fact explanatory mechanism sketches. In response to the concern that models which emphasize a network’s organization over its composition do not explain mechanistically, it is argued that this emphasis is both appropriate and consistent with the principles of mechanistic explanation. What emerges is an improved understanding of the ways in which mathematical and computational models are deployed in network neuroscience, as well as an improved conception of mechanistic explanation in general. (shrink)