In his paper ‘Scmantic Theory and Tacit Knowlcdgc’, Gareth Evans uscs a familiar kind of cxamplc in ordcr to render vivid his account of tacit knowledge. We arc to consider a finite language, with just one hundrcd scntcnccs. Each scntcncc is made up of a subjcct (a name) and a prcdicatc. The names are ‘a’, ‘b’, . . ., T. The prcdicatcs arc ‘F’, ‘G’, . . ., ‘O’. Thc scntcnccs have meanings which dcpcnd in a systematic way (...) upon their construction. Thus, all scntcnccs containing ‘a’ mean something about john; all scntcnccs containing ‘b’ mean something about Harry; all scntcnccs containing ‘F’ mean something about being bald; all scntcnccs containing ‘G’ mean something about being happy; and so 011. For this vcry simple language L, wc arc to consider various semantic theories. We could consider thcorics whosc dclivcranccs about wholc scntcnccs are of.. (shrink)

The evidence-based medicine movement advocates basing all medical decisions on certain types of quantitative research data and has stimulated protracted controversy and debate since its inception. Evidence-based medicine presupposes an inaccurate and deficient view of medical knowledge. Michael Polanyi’s theory of tacit knowledge both explains this deficiency and suggests remedies for it. Polanyi shows how all explicit human knowledge depends on a wealth of tacit knowledge which accrues from experience and is essential for problem solving. Edmund Pellegrino’s classic (...) treatment of clinical judgment is examined, and a Polanyian critique of this position demonstrates that tacit knowledge is necessary for understanding how clinical judgment and medical decisions involve persons. An adequate medical epistemology requires much more qualitative research relevant to the clinical encounter and medical decision making than is currently being done. This research is necessary for preventing an uncritical application of evidence-based medicine by health care managers that erodes good clinical practice. Polanyi’s epistemology shows the need for this work and provides the structural core for building an adequate and robust medical epistemology that moves beyond evidence-based medicine. (shrink)

This chapter focuses on a set of arguments whose upshot is that, whatever tacit knowledge of the axiomatic base of a semantic theory is, it cannot be construed as a genuine propositional attitude or intentional state. It outlines three criticisms that Crispin Wright has raised against Evans's dispositionalist account of tacit knowledge of semantic axioms, and the responses that have been offered by Martin Davies on Evans's behalf. The chapter outlines Wright's alternative proposal, and argues that it presupposes, (...) rather than undercuts, the Evans‐Davies account which proceeds via the imposition of the mirror constraint. It attempts to defend the suggestion that the construction of theories of meaning should be subject to Davies's mirror constraint. The chapter concludes by considering whether the project of constructing semantic theories in accordance with the mirror constraint is in tension with Wittgenstein's reflections on rule‐following. (shrink)

This paper tries to express a critical point of view on the computational turn in philosophy by looking at a specific field of study: philosophy of science. The paper starts by briefly discussing the main contributions that information and communication technologies have given to the rising of computational philosophy of science, and in particular to the cognitive modelling approach. The main question then arises, concerning how computational models can cope with the presence of tacit knowledge in science. Would it (...) be possible to develop new ways of handling this specific type of knowledge, in order to incorporate it in computational models of scientific thinking? Or should tacit knowledge lead us to other approaches in using computer sciences to model scientific cognition? These questions are addressed by making reference to a detailed case study of a recent innovation development in the field of biotechnology. (shrink)

Harry Collins is a science studies scholar no other description fits without qualification who has contributed enormously to the discussion of tacit knowledge. Collins says that he is providing an account for the ontologically bashful, meaning, presumably, that it does not carry the burdens of Durkheim's notion of the collective consciousness. Polanyi says that 'a wholly explicit knowledge is unthinkable'. Collins wants to translate this into 'strings must be interpreted before they are meaningful'. Somatic limits are the source of (...) the mystery element of tacit knowledge. In fact, machines can be programmed to do the things it involves, although they will do it in a different way. In Social Cartesianism, the individual is not the unit of analysis: the individual merely shares the collectivity's knowledge. Collins point in these contexts is that functional substitutability implies nothing about similarity in underlying causal structure. (shrink)

How can we identify and estimate workers’ tacit knowledge? How can we design a personnel mix aimed at improving and speeding up its transfer and development? How is it possible to implement tacit knowledge sustainable projects in remote areas? In order to answer these questions, it is necessary to distinguish between types of tacit knowledge, to establish what they allow for and to consider their sources. It is also essential to find a way of managing the (...) class='Hi'>tacit knowledge ‘stock’ and distribution within the workforce. In short, a conceptual framework is needed to manage tacit knowledge. Based on previous works and 2 years of action research, this paper introduces such a framework and describes its partial application to support the pre-operational training and hiring in a large industrial plant in Brazil. Two contributions emerge from the research. First, the concept of ‘levels of similarity’ is introduced as a means to qualify the experience of workers and estimate the associated tacit knowledge. Second, the capability of carrying out three types of judgement properly and speedily is put forward as being a core ability of those who possess what has been called ‘collective tacit knowledge’ (Collins in Organ Stud 28(2):257–262, 2007). In practical terms, the results indicate the opportunity for companies to capitalize on the experience and tacit knowledge of their workers in a systematic way and with due recognition. Ultimately, positive impacts are expected in their absorptive capacity as well as in their management and human resources systems, accident prevention, productivity and the development of sustainable projects in remote areas. (shrink)

The paper outlines the role that tacit knowledge plays in what might seem to be an area of knowledge that can be made fully explicit or codified and which forms a central element of Evidence Based Medicine. Appeal to the role the role of tacit knowledge in science provides a way to unify the tripartite definition of Evidence Based Medicine given by Sackett et al: the integration of best research evidence with clinical expertise and patient values. Each of (...) these three elements, crucially including research evidence, rests on an ineliminable and irreducible notion of uncodified good judgement. (shrink)

How does tacit knowledge inscribe itself into cultural and social practices? As the established distinction between tacit and explicit or discursive forms of knowledge does not explain this question, the contributions in this volume reconstruct, describe, and analyze the manifold processes by which the tacit reveals itself: They focus, for example, on metaphors, myths, and visualizations as explications of the tacit as well as on processes of embodiment. Taken together, they demonstrate that the tacit does (...) not constitute a single or unified knowledge complex, but has to be understood in its differentiated and fragmented forms. (shrink)

I respond to the reviews by Henry and Lowney of my book Tacit and Explicit Knowledge. I stress the need to understand explicit knowledge if tacit knowledge is to be understood. Tacit knowledge must be divided into three kinds: relational, somatic and collective. The idea of relational tacit knowledge is keyto pulling the three kinds apart.

This paper has two main objectives. The first one is to reflect on the validity of data in analysis and projections that underpin the engineering asset management of organizations, considering, on the one hand, a certain resistance or even inadequate use of data and information of a subjective nature and; on the other hand, a consolidated reliance on quantitative approaches and decisions based on data series. The second objective is to contextualize the applicability of combining qualitative data based on experts’ (...) experience and on the tacit knowledge built in organizations, with approaches based essentially on quantitative data, according to the data availability and the decision scenario over the asset life cycle. We present two application of an approach combining quali and quanti data. One example interrelates Statistics with Psychology and the other combines elicitated data about asset indicators with parameters deterministically calculated. Both applications aiming at providing more realistic indicators and supporting the Asset Management process to make more assertive decisions. (shrink)

How are risks and disasters prevented in high-technology environments? This is a question that has many facets. In this essay I shall discuss the aspects related to the history of knowledge, and to tacit knowledge in particular.

This study explored tacit knowledge based on an expert nurse's practice who cares for stroke patients by using the hermeneutic phenomenological approach. The participant (‘Ms. A’) was a nursing researcher and college faculty member involved in the education of advanced practice nurses; her specialty was stroke rehabilitation nursing. She was asked to describe the meaning and value she gained from her memorable nursing experiences. Four interviews—approximately 1 h each—were conducted, and the associated data were interpreted together with the participant (...) based on the method of interpretive circulation. Notably, the analysis was ended when a fusion of horizons was recognized. The participant recalled her nursing experiences based on six model cases. During the analysis, the following five elements were extracted: [belief in the ability of vulnerable people to survive]; [being together]; [respect for human dignity]; [preparedness to respond to and bear suffering together]; and [theoretical knowledge base approaches true understanding of patient experience]. Further, the nursing model—the Roy Adaptation Model—utilized by Ms. A in the process of recognizing humans as whole beings was deeply interpreted and implemented as a guideline for her implicit advanced practice. Moreover, her deep understanding and utilization of theoretical knowledge base also built the foundation for her implicit advanced practice. In conclusion, Ms. A's tacit knowledge and the elements support the process of tacit knowledge acquisition. Her narratives, hermeneutic attitude as an interpreter, and learning attitude throughout interaction with others will strongly help her knowledge development. We intend to continue the study with multiple participants and explore the structure of tacit knowledge possessed by advanced practitioners. Future endeavours will include the development of a tacit knowledge learning strategy. (shrink)

Ikujiro Nonaka, whose formative experience is Japanese, is an established scholar who has written about large business organizations. He sees knowledge at the heart of the organization and its products and aims to develop Michael Polanyi’s conception of tacit knowledge in a practical direction to enhance organizational “knowledge creation.” For Nonaka, what matters is the practice, the doing, the embodiment of knowledge. An organization can amplify and crystallize individuals’ tacit knowledge in a process that allows them to experience (...) deeper understanding. Nonaka holds that it is iimportant to explore the potential that knowledge holds. His spiral process describes disciplined practices that make tacit knowledge independent and available to restructure the organizational knowledge context. (shrink)

Since Michael Polanyi coined the term “tacit knowledge” in 1958, a huge amount of literature has been produced on this topic. Gascoigne and Thornton’s monograph represents one of the most recent attempts to clarify the concept of tacit knowledge.For other recent publications on tacit knowledge see Collins , Yu and Turner . In their engagement with various thinkers, most notably Polanyi, Ryle, Heidegger, Wittgenstein, John Searle, Hubert Dreyfus, and John McDowell, etc., the authors make impressive efforts to (...) situate the discussion of tacit knowledge in the context of mainstream philosophy. They shed new light on the concept of tacit knowledge by embedding it in contemporary debates, such as those on knowing how, rule-following, conceptualism, language maste .. (shrink)

In what follows I propose to bring out certain methodological properties of projects of modelling the tacit realm that bear on the kinds of modelling done in connection with scientific cognition by computer as well as by ethnomethodological sociologists, both of whom must make some claims about the tacit in the course of their efforts to model cognition. The same issues, I will suggest, bear on the project of a cognitive psychology of science as well.

Neil Gascoigne and Tim Thornton’s Tacit Knowledge is an attempt to find a place for tacit knowledge as “knowledge” within the limits of analytic epistemology. They do so by reference to Jason Stanley and Timothy Williamson’s analysis of the term “way” and by the McDowell-like claim that reference to the tacitly rooted “way” of doing something exhausts the knowledge aspect of tacit knowledge, which preserves the notion of tacit knowledge, while excluding most of Michael Polanyi’s examples, (...) and rendering Hubert Dreyfus’s and John Searle’s accounts irrelevant. This is more a redefinition of terms than an account of tacit knowledge. (shrink)

Pierre Bourdieu has developed a philosophy of social science, grounded in the phenomenological tradition, which treats knowledge as a practical ability embodied in skilful behaviour, rather than an intellectual capacity for the representation and manipulation of propositional knowledge. He invokes Wittgenstein’s remarks on rule-following as one way of explicating the idea that knowledge is a skill. Bourdieu’s conception of tacit knowledge is a dispositional one, adopted to avoid a perceived dilemma for methodological individualism. That dilemma requires either the explanation (...) of regularities in social behaviour as the result of the tacit representation of procedural rules (‘legalism’) or the self-conscious representation of behavioural goals (‘voluntarism’) by individuals. After explaining the apparent dilemma, I then argue that Wittgenstein’s remarks on rule following actually undermine, rather than support, a dispositional solution. Nonetheless, the philosophy of social science can survive without a dispositional account of knowledge. Such a social science needs, firstly, to embrace one horn of the dilemma, voluntarism, provided that the relevant regularities can be explained as unintended consequences of agents’ self-represented intentions. Secondly, such a social science should treat theorists’ interpretations as unifying generalizations, not hypotheses about the acquisition of tacit knowledge. Finally, where appeal to cognitive psychology can distinguish otherwise equivalent theories in social science, social science should incorporate the data of cognitive psychology concerning tacit mental processes. (shrink)

Harry Collins’s Tacit and Explicit Knowledge characterises tacit knowledge through a number of antonyms: explicit, explicable, and then explicable via elaboration, transformation, mechanization and explanation and, most fundamentally, what can be communicated via “strings”. But his account blurs the distinction between knowledge and what knowledge can be of and has a number of counter-intuitive consequences. This is the result of his adoption of strings themselves rather than the use of words or signs as the mark of what is (...) explicit and, I suggest, it may stem from his earlier response to Wittgenstein’s rules regress. (shrink)

Tacit knowledge is the form of implicit knowledge that we rely on for learning. It is invoked in a wide range of intellectual inquiries, from traditional academic subjects to more pragmatically orientated investigations into the nature and transmission of skills and expertise. Notwithstanding its apparent pervasiveness, the notion of tacit knowledge is a complex and puzzling one. What is its status as knowledge? What is its relation to explicit knowledge? What does it mean to say that knowledge is (...) tacit? Can it be measured? Recent years have seen a growing interest from philosophers in understanding the nature of tacit knowledge. Philosophers of science have discussed its role in scientific problem-solving; philosophers of language have been concerned with the speaker's relation to grammatical theories; and phenomenologists have attempted to describe the relation of explicit theoretical knowledge to a background understanding of matters that are taken for granted. This book seeks to bring a unity to these diverse philosophical discussions by clarifying their conceptual underpinnings. In addition the book advances a specific account of tacit knowledge that elucidates the importance of the concept for understanding the character of human cognition, and demonstrates the relevance of the recommended account to those concerned with the communication of expertise. The book will be of interest to philosophers of language, epistemologists, cognitive psychologists and students of theoretical linguistics. (shrink)

This paper discusses the interrelationship between wisdom, science and craft from the perspective of the Wittgenstein concept of tacit knowledge. It challenges the notion of the ‘rules-model’ as put forward by Logical Positivists, and shows the limitation of this model for describing the tacit dimension of knowledge. The paper demonstrates the crucial role of practice in ‘rule-following’ in the real world. It is held that ‘to follow a rule’ is to practice a custom, a usage or an institutional (...) practice. Hence, rules can only exist as a link in social life.The dream of the ‘precise’ language can only be realised in a closed scientific world. It is inadequate for reflecting the user's relationship to language and its content and practice in varied ‘use situations’. It is only through examples that we learn to deal with, describe, interpret and learn from the new situations.The rule-based models which are used to acquire and describe human knowledge in syntactic and propositional forms are, in effect, an impoverishment of the description of reality. It is argued that expert knowledge and linguistic knowledge are linked together and emerge as two sides of the same subject as the pragmatic perspective of reality. The tacit dimension of expert knowledge is, in many cases, more significant than the linguistic knowledge, especially in the case of the vocational and aesthetic world.The challenge to AI researchers, therefore, is to recognise that knowledge based systems which ignore the tacit dimension of expert knowledge not only distance the user from reality but also impoverish the learning process itself. (shrink)

This article offers a detailed reading Gascoigne and Thornton’s book Tacit Knowledge, which aims to account for the tacitness of tacit knowledge while preserving its status as knowledge proper. I take issue with their characterization and rejection of the existential-phenomenological Background—which they presuppose even as they dismiss—and their claim that TK can be articulated “from within”—which betrays a residual Cartesianism, the result of their elision of conceptuality and propositionality. Knowledgeable acts instantiate capacities which we might know we have (...) and of which we can be aware, but which are not propositionally structured at their “core”. Nevertheless, propositionality is necessary to what Robert Brandom calls, in Making It Explicit and Articulating Reasons, “explicitation”, which notion also presupposes a tacit dimension, which is, simply, the embodied person, without which no conception of knowledge can get any purchase. On my view, there is no knowledgeable act that can be understood as such separately from the notion of skilled corporeal performance. The account I offer cannot make sense of so-called “knowledge-based” education, as opposed to systems and styles which supposedly privilege “contentless” skills over and above “knowledge”, because on the phenomenological and inferentialist lines I endorse, neither the concepts “knowledge” nor “skill” has any purchase or meaning without the other. (shrink)

This paper elaborates on the link between different types and degrees of experience that can be gone through within a form of life or collectivity—the so-called levels of immersion—and the development of distinct types of tacit knowledge and expertise. The framework is then probed empirically and theoretically. In the first case, its ‘predictions’ are compared with the accounts of novices who have gone through different ‘learning opportunities’ during a pre-operational training programme for running a huge nickel industrial plant in (...) Brazil. These are also analysed vis-à-vis the experience of an expert who has designed and experienced the outcomes of two pre-operational training sessions in the nickel industry before developing and managing the one discussed here. Theoretically, the framework is used to pinpoint exactly what interactional experts who have developed their expertise through linguistic socialisation alone are able to do as well as to analyse the case of technical connoisseurs. The results indicate that the proposed framework is useful. It supports the design and improvement of training programmes for the development of tacit knowledge while at the same time bringing about a refined analysis of claims concerning the abilities of types of experts and expertise. (shrink)

The current quality assurance culture demands the explicit articulation, by means of publication, of what have been hitherto tacit norms and conventions underlying disciplinary genres. The justification is that publication aids student performance and guarantees transparency and accountability. This requirement makes a number of questionable assumptions predicated upon what we will argue is an erroneous epistemology. It is not always possible to articulate in a publishable form a detailed description of disciplinary practices such as assessment. As a result publication (...) cannot achieve its stated goals. There are always elements of our knowledge that cannot be linguistically articulated. (shrink)

In this new volume in the Oxford Psychology Series, the author presents a highly readable account of the cognitive unconscious, focusing in particular on the problem of implicit learning. Implicit learning is defined as the acquisition of knowledge that takes place independently of the conscious attempts to learn and largely in the absence of explicit knowledge about what was acquired. One of the core assumptions of this argument is that implicit learning is a fundamental, "root" process, one that lies at (...) the very heart of the adaptive behavioral repertoire of every complex organism. The author's goals are to outline the essential features of implicit learning that have emerged from the many studies that have been carried out in a variety of experimental laboratories over the past several decades; to present the various alternative perspectives on this issue that have been proposed by other researchers and to try to accommodate these views with his own; to structure the literature so that it can be seen in the context of standard heuristics of evolutionary biology; to present the material within a functionalist approach and to try to show why the experimental data should be seen as entailing particular epistemological perspectives; and to present implicit processing as encompassing a general and ubiquitous set of operations that have wide currency and several possible applications. Chapter 1 begins with the core problem under consideration in this book, a characterization of "implicit learning" as it has come to be used in the literature. Reber puts this seemingly specialized topic into a general framework and suggests a theoretical model based on standard heuristics of evolutionary biology. In his account, Reber weaves a capsule history of interest in and work on the cognitive unconscious. Chapter 2 turns to a detailed overview of the experimental work on the acquisition of implicit knowledge, which currently is of great interest. Chapter 3 develops the evolutionary model within which one can see learning and cognition as richly intertwining issues and not as two distinct fields with one dominating the other. Finally, Chapter 4 explores a variety of entailments and speculations concerning implicit cognitive processes and their general role in the larger scope of human performance. (shrink)

How the idea of tacit knowledge is being understood typically? The article reconstructs interpretations in context of three different disciplines: (1) linguistics, (2) cognitive psychology and (3) sociology of knowledge. Furthermore, it proposes (4) definitional criteria for a general notion of tacit knowledge.

Tacit knowledge sharing discussed in this study is important in the area of business ethics, because an unwillingness to share knowledge that may hurt an organization’s survival is seen as being seriously unethical. In the proposed model of this study, distributive justice, procedural justice, and cooperativeness influence tacit knowledge sharing indirectly via two mediators: organizational commitment and trust in co-workers. Accordingly, instrumental ties and expressive ties influence tacit knowledge sharing indirectly only via the mediation of trust in (...) co-workers. The model is assessed by using data from different companies’ employees, who attend an evening college in Taiwan for advance study. The test results of this study indicate that tacit knowledge sharing is affected by distributive justice, procedural justice, and cooperativeness indirectly via organizational commitment. Additionally, tacit knowledge sharing is also affected by distributive justice, instrumental ties, and expressive ties via trust in co-workers. The paths from procedural justice and cooperativeness to trust in co-workers are shown to be insignificant. Managerial implications of the empirical findings are also provided. (shrink)

In this paper, we discuss and extend the taxonomy of tacit knowledge proposed by Collins in his 2010 book, Tacit and Explicit Knowledge. First, we question the definition and the name of one of Collins’s three categories of TK, namely Relational Tacit Knowledge (RTK). After having explained the true fundamental principle that individuates RTK as one category distinct from the two others (Somatic Tacit Knowledge STK and Collective Tacit Knowledge CTK), we suggest an alternative name (...) for RTK, which fits this principle better. Second, our analyses identify a possible ambiguity in the interpretation of RTK, STK and CTK, and indicate how to avoid the related possible confusions. For this purpose, we introduce several notations that specify Collins’s ones. The corresponding developments strengthen and specify a point implicitly suggested in Collins’s book, namely the existence of a serious asymmetry between RTK on the one hand, and STK/CTK on the other. Third, the paper attempts to elaborate and complete Collins’s framework. In this vein, we introduce the possibility of different sub-types of RTK. One of these sub-cases raises the issue of individual, intellectual tacit knowledge—a case that does not seem to have any place in Collins’s picture. We also look at Collins’s framework in a dynamical perspective, and discuss the possibility—not considered by Collins—of dynamic transformations between some of the three categories. Finally, we make two suggestions in order to avoid confusions or misunderstandings when using Collins’s distinctions. When the qualities “explicit”, “explicable” or “tacit” are attributed to some knowledge, these qualities should always be accompanied by the specification for whom and when. Moreover, the attributions “explicit” and “explicable” should always indicate which of Collins’s four senses is meant—elaboration, transformation, mechanization or scientific explanation. (shrink)

Tacit knowledge is widely acknowledged to be an important component of innovation, but such recognition is rarely accompanied by more detailed explanations about the nature of tacit knowledge, why such knowledge is significant, how it becomes codified or whether there may be limits to codification. This paper attempts to fill some of the gaps, drawing on a recent study of university/industry links in three emerging technologies. It concludes that tacit knowledge, which can only be transmitted through personal (...) interaction, will continue to play an important role in innovation. This derives from a variety of reasons, but most significant are the complexity of systems and the emergence of new technologies. (shrink)

In this new volume in the Oxford Psychology Series, the author presents a highly readable account of the cognitive unconscious, focusing in particular on the problem of implicit learning. Implicit learning is defined as the acquisition of knowledge that takes place independently of the conscious attempts to learn and largely in the absence of explicit knowledge about what was acquired. One of the core assumptions of this argument is that implicit learning is a fundamental, "root" process, one that lies at (...) the very heart of the adaptive behavioral repertoire of every complex organism. The author's goals are to outline the essential features of implicit learning that have emerged from the many studies that have been carried out in a variety of experimental laboratories over the past several decades; to present the various alternative perspectives on this issue that have been proposed by other researchers and to try to accommodate these views with his own; to structure the literature so that it can be seen in the context of standard heuristics of evolutionary biology; to present the material within a functionalist approach and to try to show why the experimental data should be seen as entailing particular epistemological perspectives; and to present implicit processing as encompassing a general and ubiquitous set of operations that have wide currency and several possible applications. Chapter 1 begins with the core problem under consideration in this book, a characterization of "implicit learning" as it has come to be used in the literature. Reber puts this seemingly specialized topic into a general framework and suggests a theoretical model based on standard heuristics of evolutionary biology. In his account, Reber weaves a capsule history of interest in and work on the cognitive unconscious. Chapter 2 turns to a detailed overview of the experimental work on the acquisition of implicit knowledge, which currently is of great interest. Chapter 3 develops the evolutionary model within which one can see learning and cognition as richly intertwining issues and not as two distinct fields with one dominating the other. Finally, Chapter 4 explores a variety of entailments and speculations concerning implicit cognitive processes and their general role in the larger scope of human performance. (shrink)

Introduction Harry Collins is internationally recognized as a distinguished sociologist of science who writes creatively on a substantial number of varied subjects. He is acknowledged as one of the prominent specialists on the topic of tacit knowledge and has played an important role in the introduction of this topic into science studies. He has investigated the topic extensively, most famously through several case studies of physics [Collins 1974, 1984, 1985, 1990, 2001a,b, 2004], [Collins &...

The ongoing pursuit of tacit knowledge Content Type Journal Article Pages 1-5 DOI 10.1007/s11016-010-9500-6 Authors Charles W. Smith, Department of Sociology, Queens College, CUNY, 65-30 Kissena Boulevard, Flushing, NY 11367, USA Journal Metascience Online ISSN 1467-9981 Print ISSN 0815-0796.

In this paper, I define tacit knowledge as a kind of causal-explanatory structure, mirroring the derivational structure in the theory that is tacitly known. On this definition, tacit knowledge does not have to be explicitly represented. I then take the notion of a modular theory, and project the idea of modularity to several different levels of description: in particular, to the processing level and the neurophysiological level. The fundamental description of a connectionist network lies at a level between (...) the processing level and the physiological level. At this level, connectionism involves a characteristic departure from modularity, and a correlative absence of syntactic structure. This is linked to the fact that tacit knowledge descriptions of networks are only approximately true. A consequence is that strict causal systematicity in cognitive processes poses a problem for the connectionist programme. (shrink)

This chapter contrasts the recent emphasis on operationalism as the route to reliability in psychiatry with arguments for an ineliminable role for tacit knowledge. Although Michael Polanyi popularized the idea of tacit dimension, the chapter argues that two clues he offers as to its nature-that we know more than we can tell and that knowledge is an active comprehension of things known-are better interpreted through regress arguments set out by Ryle and Wittgenstein. Those arguments, however, suggest that (...) class='Hi'>tacit knowledge is not inexpressible but merely inexpressible in context-free terms. The chapter suggests instead that tacit knowledge is best understood to be context-dependent practical knowledge. So understood, the regress arguments suggest that the operational approach to psychiatric diagnosis can never free itself from a tacit dimension. Given that claim, then Parnas' opposing view of diagnosis can be seen as a way to embrace, rather than deny, the importance of tacit knowledge and skilled clinical judgment for psychiatry. (shrink)