This chapter contains sections titled: Abstract The Model ‐ Theoretic Argument Difficulties and Differences Putnam's Progress Implications Objections and Replies References.

Putnam's model theoretic argument against metaphysical realism can be reconstructed as valid, with premises acceptable to the realist. There is no illegitimate assumption that the causal theory of reference is false.

Two of Hilary Putnam's model-theoretic arguments against metaphysical realism are examined in detail. One of them is developed as an extension of a model-theoretic argument against mathematical realism based on considerations concerning the so-called Skolem-Paradox in set theory. This argument against mathematical realism is also treated explicitly. The article concentrates on the fine structure of the arguments because most commentators have concentrated on the major premisses of Putnam's argument and especially on (...) his treatment of metaphysical realism. It is shown that the validity of Putnam's arguments is doubtful and that realists are by no means forced to accept the theses Putnam ascribes to them. It is concluded that Putnam fails to give convincing arguments for rejecting mathematical or metaphysical realism. Furthermore, Putnam's internal realism is discussed critically. (shrink)

In “Models and Reality”, H. Putnam formulated his model-theoretic argument against “metaphysical realism”. The article proposes a meta-reconstruction of Putnam’s model-theoretic argument in the light of two mutually compatible interpretations of it–elaborated by Manuel Garcia-Carpintero and Igor van Douven. A critical reflection on these interpretations and their adequacy for Putnam’s argument allows us to expose new theses coherent with Putnam’s reasoning and indicate new paths to improve this argument for our reconstruction task. (...) In particular, we show that Putnam’s position may be coherent with van Douven’s versions of Global Descriptivism under some conditions, but Putnam cannot reject realism as quickly as Carpintero suggests. We show that Suszko’s canonic axiomatic system and Sneed’s concept of theory may provide valuable support for Putnam’s argument. Finally, we critically evaluate Carpintero’s theses about the genesis of unintended interpretations of our languages, adopting the machinery of the Upward Skolem–Loewenheim Theorem and Knight’s Theorem. (shrink)

This chapter concentrates on the version of Putnam's argument set forth in his Reason, Truth and History. It explains how, in general terms, that argument is best conceived as working. Cursory inspection of Putnam's overall dialectic reveals it to incorporate three sub‐arguments, collectively designed to show that the metaphysical realist confronts an insuperable problem over explaining how our words may possess determinate reference. The chapter considers Putnam's version of the Permutation Argument, aimed at showing (...) that reference cannot be determined by fixing the truth‐conditions of whole sentences. It then reviews Putnam's 'just more theory' argument, designed to show that the metaphysical realist cannot rescue the situation by appeal to causal or other natural connections between our words and the world. The chapter considers how the considerations adduced by Hilary Putnam might be seen as an argument telling selectively against metaphysical realism. (shrink)

Since 1976 Hilary Putnam has on many occasions proposed an argument, founded on some model-theoretic results, to the effect that any philosophical programme whose purpose is to naturalize semantics would fail to account for an important feature of every natural language, the determinacy of reference. Here, after having presented the argument, I will suggest that it does not work, because it simply assumes what it should prove, that is that we cannot extend the metatheory: Putnam appears (...) to think that all we may determinately say about the relations between words and entities in the world is what the model theory tells us, but he has never offered justifications for that. At the end of the article, I will discuss the apparently reliable intuition that seems to me to be at the root of the argument, that is that, given a formal theory, there is an infinite number of ways of connecting it to, or of projecting it onto, the world. I will suggest that we should resist this intuition, because it rests on a very doubtful notion of world, which assumes that for any class of objects there is a corresponding property. (shrink)

Putnam famously attempted to use model theory to draw metaphysical conclusions. His Skolemisation argument sought to show metaphysical realists that their favourite theories have countable models. His permutation argument sought to show that they have permuted models. His constructivisation argument sought to show that any empirical evidence is compatible with the Axiom of Constructibility. Here, I examine the metamathematics of all three model-theoretic arguments, and I argue against Bays (2001, 2007) that Putnam is largely (...) immune to metamathematical challenges. (shrink)

The first section of the paper gives a very condensed history of the evolution of the author’s views on realism and anti-realism. It emphasizes that his previously accepted form of anti-realism was abandoned not because of the alleged fallacies in the model-theoretic argument against metaphysical realism, but due to his rejection of some of the assumptions on which it rests - assumptions which have been almost universal in philosophy after Descartes. The second section discusses and defends the (...) part of the model-theoretic argument that many critics have almost universally found fallacious, namely the „just more theory” move. In the appendix to the paper the author elaborates what does his return to common sense realism mean. He points out that his position involves a negative element, the rejection of the idea that truth cannot outrun verifiability, and two positive elements: returning (as close as possible) to „naive realism” with respect to perception, and a disquotational account of truth similar to one endorsed by Wittgenstein. (shrink)

The model-theoretic argument, which Putnam employs to argue againstmetaphysical realism, has faced serious objections of many realist opponents.Igor Douven in his recent paper offers a new interpretation of the model-theoreticargument, which avoids the previous objections. The purpose of this paper is toshow that Douven's reconstruction of Putnam's argument is not successful, andhence that the realist objections still stand.

Putnam’s model-theoretic arguments for the indeterminacy of reference have been taken to pose a special problem for mathematical languages. In this paper, I argue that if one accepts that there are theory-external constraints on the reference of at least some expressions of ordinary language, then Putnam’s model-theoretic arguments for mathematical languages don’t go through. In particular, I argue for a kind of descriptivism about mathematical expressions according to which their reference is “anchored” in the reference of (...) expressions of ordinary language. These anchors add enough to the content of mathematical expressions to forestall the radical kind of indeterminacy that model-theoretic arguments are purported to show, while still leaving room for a plausible, moderate kind of indeterminacy. (shrink)

Bas van Fraassen has recently argued for a "dissolution" of Hilary Putnam's well-known model-theoretic argument. In this paper I argue that, as it stands, van Fraassen's reply to Putnam is unsuccessful. Nonetheless, it suggests the form a successful response might take.

The first section of the paper gives a very condensed history of the evolution of the author's views on realism and anti-realism. It emphasizes that his previously accepted form of anti-realism was abandoned not because of the alleged fallacies in the model-theoretic argument against metaphysical realism, but due to his rejection of some of the assumptions on which it rests - assumptions which have been almost universal in philosophy after Descartes. The second section discusses and defends the (...) part of the model-theoretic argument that many critics have almost universally found fallacious, namely the "just more theory" move. In the appendix to the paper the author elaborates what does his return to common sense realism mean. He points out that his position involves a negative element, the rejection of the idea that truth cannot outrun verifiability, and two positive elements: returning (as close as possible) to "naive realism" with respect to perception, and a disquotational account of truth similar to one endorsed by Wittgenstein. (shrink)

In this paper I investigate Putnam’s model-theoretic argument from a transcendent standpoint, in spite of Putnam’s well-known objections to such a standpoint. This transcendence, however, requires ascent to something more like a Tarskian meta-level than what Putnam regards as a “God’s eye view”. Still, it is methodologically quite powerful, leading to a significant increase in our investigative tools. The result is a shift from Putnam’s skeptical conclusion to a new understanding of realism, truth, correspondence, knowledge, and theories, (...) or certain aspects thereof, based on, among other things, a better understanding of what models are designed (and not designed) to do. (shrink)

This chapter contains section titled: The Model‐theoretic Argument The “Second Argument” “Finished Science” Conceptual Relativity Sosa's “Non‐linguistic” Restatement Living with the Explosion The Last Option: Eliminativism Conclusion.

In a recent article, James Van Cleve joins a growing throng who have argued that Hilary Putnam's model-theoretic argument (and his "just more theory" response) begs the question against those who hold externalist theories of reference. Van Cleve has misinterpreted Putnam's argument. Putnam does not demand that the statements which make up the causal theory of reference must, themselves, do the reference-fixing. That would be question-begging. Rather, Putnam's argument is a "reductio", which (...) can only be blocked with a theory of reference that is both substantive and plausible. Putnam argues that there is no interpretation of "causality" that meets both conditions. (shrink)

In "Realism and Reason" Hilary Putnam has offered an apparently strong argument that the position of metaphysical realism provides an incoherent model of the relation of a correct scientific theory to the world. However, although Putnam's attack upon the notion of the "intended" interpretation of a scientific theory is sound, it is shown here that realism may be formulated in such a way that the realist need make no appeal to any "intended" interpretation of such a theory. (...) Consequently, it can be shown that realism is immune to Putnam's criticism and that attempts at reformulating this criticism are not likely to meet with success. (shrink)

In an earlier paper, I claimed that one version of Putnam's model-theoretic argument against realism turned on a subtle, but philosophically significant, mathematical mistake. Recently, Luca Bellotti has criticized my argument for this claim. This paper responds to Bellotti's criticisms.

Abstract: Hilary Putnam has reformulated his model-theoretic argument as an argument against indirect realism in the philosophy of perception. This new argument is reviewed and defended. Putnam’s new focus on philosophical theories of perception (instead of metaphysical realism) makes better sense of his previous responses to the objection from the causal theory of reference. It is argued that the model-theoretic argument can also be construed as an argument that holders of a (...) causal theory of reference should adopt direct realism in the philosophy of perception. (shrink)

Igor Douven has offered an original reconstruction and defence of Putnam's model-theoretic argument against metaphysical realism. Douven's construal has notable exegetical virtues, since it makes sense of some assumptions in Putnam's argument which his opponents have considered question-begging or puzzling. In this article I provide an indirect defence of metaphysical realism, by showing why this new version of the anti-realist argument should also be rejected. The main problems in the Douven-Putnam argument come (...) from ascribing to the realist a distorted view of correspondence truth. The view entails that when no feature selects just one of all the possible interpretations of language the existence of an interpretation suffices to make true a theory. The sensible realist is not committed to this extreme conception of correspondence truth. /// Igor Douven ha presentado y defendido una reconstructión del argumento teórico-modelista de Putnam contra el realismo metafísico. Esta versión tiene ciertas virtudes exegéticas, pues hace inteligible algunos presu- puestos putnamianos que sus críticos han considerado injustificados o sorprendentes. En este artículo proporciono una defensa indirecta del realismo metafisico, mostrando por qué debe también rechazarse el argumento antirrealista bajo esta nueva forma. Los problemas principales del argumento Douven-Putnam proceden de atribuir al realista una concepción distorsionada de la idea de verdad como correspondencia. Conforme a esa concepción, la ausencia de factores que seleccionen una única interpretación del lenguaje de entre las muchas posibles conlleva que la existencia de alguna interpretación ya es suficiente para hacer verdadera a una teoría que sea consistente. El realista sensato no está obligado a aceptar esa tesis. (shrink)

Putnam's Model-Theoretic argument purports to show that, contrary to what the metaphysical realist is committed to, an epistemically ideal theory which satisfies all operational and theoretical constraints can be guaranteed to be true. He draws the additional antirealist conclusion that there can be no single privileged relation of reference. I argue that the very possibility of a so-called ideal theory satisfying all operational constraints presupposes a determinate relation of reference, and hence Putnam must assume precisely what (...) he denies. (shrink)

Putnam's ``model-theoretic'' argument against metaphysical realism presupposes that an ideal scientific theory is expressible in a first order language. The central aim of this paper is to show that Putnam's ``first orderization'' of science, although unchallenged by numerous critics, makes his argument unsound even for adequate theories, never mind an ideal one. To this end, I will argue that quantitative theories, which dominate the natural sciences, can be adequately interpreted and evaluated only with the (...) help of so-called theories of measurement whose epistemological and methodological purpose is to justify systematic assignments of quantitative values to objects in the world. And, in order to fulfill this purpose, theories of measurement must have an essentially higher order logical structure. As a result, Putnam's argument fails because much of science turns out to rest on essentially higher order theoretical assumptions about the world. (shrink)

In this article, I have two aims. Firstly, I argue that Hilary Putnam's model theoretic indeterminacy argument against external realism and Saul Kripke's so-called Kripkensteinian argument against semantic realism have the same dialectical structure and the same conclusion---both force the opponent to face the same dilemma. Namely: either adopt meaning minimalism or postulate unobservable semantic facts. Secondly, I analyze more closely the first horn of the dilemma---meaning minimalism. This is the position according to which there (...) are no truth conditions for meaning-ascriptions. It has been suggested that this position is incoherent. However, I argue that there is a coherent option available for the meaning minimalist. As Crispin Wright has proposed, a coherent meaning minimalist has to adopt a structured truth-predicate with at least two levels: one is a minimal or a deflationary truth-predicate for a semantic discourse and the other, more substantial or objective truth-predicate for discourses like natural sciences. Subsequently, this leads to a position close to Huw Price's global expressivism. Thus, the ultimate dilemma that Putnam's and the Kripkensteinian argument establish is the following choice: either meaning minimalism with a structured two-level truth-predicate or robust realism regarding meaning. (shrink)

Hilary putnam has tried to refute the realist doctrine that the operational verification of a theory never logically precludes its objective falsity by means of an argument involving model-theoretic considerations. in this paper it is first shown that this argument does not work if the theory in question is open to revision. next it is argued that a realist need not and should not admit the notion of the sort of unrevisable, ideal theory required for the (...) purposes of putnam's argument. (shrink)

Failure to recognize the "realistic" motivations for Putnam's commitment to internal realism has led to a widely shared misunderstanding of Putnam's arguments against metaphysical realism. Realist critics of these arguments frequently offer rebuttals that fail to confront his arguments. Simply put, Putnam's arguments --the brains in a vat argument as well as the model-theoretic argument -- are "reductios" that are intended to show that "metaphysical realism itself is not sufficiently realistic". If that claim (...) can be substantiated then Putnam can go on to argue that his own view is, by comparison, more realistic than metaphysical realism. (shrink)

The question of truth is perhaps a perennial question of philosophy. Is truth “merely” epistemological, a function of contingent human practices and conventions, or should we adopt a stonger, metaphysical conception of truth along realist lines, understood as correspondence with objectively existing reality? In this paper I examine a famous debate in the analytic philosophy of language that hinges on the status of truth – specifically, the challenge to traditional or metaphysical realism posed by Hilary Putnam’s model-theoretic (...) class='Hi'>argument and the “paradox” that David Lewis derived from it. In the end, I will argue that metaphysical realism is a theoretically excessive position with regards to truth, and that a pragmatic or epistemological understanding of realism is, in Putnam’s words, “all the realism we want or need.”. (shrink)

Hilary Putnam's argument against metaphysical realism (commonly referred to as the "model theoretic argument") has now enjoyed two decades of discussion.(1) The text is rich and contains variously construable arguments against variously construed philosophical positions. David Lewis isolated one argument and called it "Putnam's Paradox".(2) That argument is clear and concise; so is the paradoxical conclusion it purports to demonstrate; and so is Lewis' paradox-avoiding solution. His solution involves a position I call (...) "anti-nominalism": not only are classes real, but they are divided into arbitrary and 'natural' classes. The natural classes 'carve nature at the joints', being (as other philosophers might say) the extensions of 'real' properties, universals, or Forms.(3) Thus the argument was turned, in effect, into support for a metaphysical realism stronger than Putnam envisaged. (shrink)

In "Unnatural Science"(1) Catherine Elgin examines the dilemma which David Lewis sees posed by Putnam's model-theoretic argument against realism. One horn of the dilemma commits us to seeing truth as something all too easily come by, a virtue to be attributed to any theory meeting relatively minimal conditions of adequacy. The other horn commits us to "anti-nominalism", some version of the ancient doctrine that language must "carve nature at the joints": that there are natural kinds or (...) classes which alone qualify as referents (extensions) for our predicates. Elgin offers a searching critique of Lewis' response (accepting the second horn) and an illuminating defence of its contrary: "we cannot construe (mere) truth as the end of scientific inquiry. Not ... because truth is too hard to come by, but because it is too easy" (p. 301). (shrink)

Many philosophers have shown great interest in the recent anti-realist turn in Hilary Putnam's thought, whereby he rejects "meta-physical realism" in favor of "internal realism". However, many have also found it difficult to gain an exact understanding, and hence a correct assessment of Putnam's ideas. This work strives for some progress on both of these accounts. ;Part one explicates what Putnam understands by "metaphysical realism" and considers to what extent Putnam himself formerly adhered to it. It reconstructs (...) class='Hi'>Putnam's arguments for the indeterminacy of reference and for the rejection of reference and of truth as correspondence, and it shows how such arguments hinge both on considerations in the theory of reference and in metaphysics. It suggests that commentators have often missed the actual structure of Putnam's argumentation, e.g. by simply identifying it with the so called "model-theoretic" argument. Finally, Part One examines Putnam's "internal realism", stressing its ties to such authors as Kant, Goodman and Dummett, and explaining in what senses it is really a strong kind of anti-realism. Basically, Putnam does not deny that a mind-independent world exists, but he denies that we may refer to it, and claims that the world we know is thoroughly mind-dependent. ;Part two criticizes Putnam's arguments for indeterminacy along with some similar indeterminacy arguments such as Goodman's argument on confirmation, and the Kripke-Wittgenstein argument on rules. This is done by vindicating the notion of objective similarity, and by relying on it to fix reference. Putnam's claim that we have no theory showing how reference could possibly be determinate is countered by sketching a possible account of reference--distinctly owing to functionalism--which might answer such question. Putnam's notorious "brains in the vat" argument is also discussed and criticized. ;Putnam's metaphysical picture, by which the mind-independent world is not sorted out into objects or properties, is granted. But it is argued that nonetheless we may refer to the mind-independent world, and have beliefs which are true of it. (shrink)

The model-theoretic argument known as Putnam´s paradox threatens our notion of truth with triviality: Almost any world can satisfy almost any theory. Formal argument and intuition are at odds. David Lewis devised a solution according to which the very stucture of the world fixes how it is to be divided into elite classes which determine the reference of any true theory. Three claims are defended: Firstly, Lewis´ proposal must be completed by an account of successful referential (...) intentions. Secondly, contrary to Catherine Elgin´s criticism of Lewis, natural properties corresponding to elite classes may play a role in sound scientific inquiry. Thirdly, despite Bas van Fraassen´s objection that the sceptic cannot consistently maintain doubts about reference, there is a promising sceptical strategy of exploiting Putnam´s results which is answered by Lewis´ account. (shrink)

Hilary Putnam's Model-Theoretic argument attempts to dispose of the view that science provides us with a literally true description of the world. It uses the Löwenheim-Skolem Theorem to show that all consistent scientific theories are true of the real world, even if they contradict each other. This is incompatible with the realist conception of truth, which allows only for one version of reality. So, Putnam rejected this conception of truth in favour of his own 'internal realism,' (...) which claims that theories can only be true or false within themselves; within their own framework. However, I demonstrate that the Model-Theoretic argument is unsound. It relies on a false premise – that every consistent theory is true of the real world. Putnam uses a clever manipulation of model theory to attempt to convince us of the truth of this premise, but I show that he commits a fundamental error in his method. (shrink)

Putnam's Model- Theoretic Argument has been generally held as invalid. In this work, attention is addressed to two broad facts understated by critics and commentators: (i) there are, at least, two different model-theoretic arguments. One is directed against realism and the other is directed to naturalistic semantics. The general rejection affects the former, but it is open to discussion if it affects the latter; (ii) on the other hand, the model-theoretic argument (...) construed as a reductio argument has not - prima facia - ontological consequences, but only restrains our methodology to deal with the intentional realm. (shrink)

Although it is not yet officially recognized as a clinical entity which is diagnosable, Internet Gaming Disorder (IGD) has been included in section III for further study in the DSM-5 by the American Psychiatric Association (APA, 2013). This is important because there is increasing evidence that people of all ages, in particular teens and young adults, are facing very real and sometimes very severe consequences in daily life resulting from an addictive use of online games. This article summarizes general aspects (...) of IGD including diagnostic criteria and arguments for the classification as an addictive disorder including evidence from neurobiological studies. Based on previous theoretical considerations and empirical findings, this paper examines the use of one recently proposed model, the Interaction of Person-Affect-Cognition-Execution (I-PACE) model, for inspiring future research and for developing new treatment protocols for IGD. The I-PACE model is a theoretical framework that explains symptoms of Internet addiction by looking at interactions between predisposing factors, moderators, and mediators in combination with reduced executive functioning and diminished decision making. Finally, the paper discusses how current treatment protocols focusing on Cognitive-Behavioral Therapy for Internet addiction (CBT-IA) fit with the processes hypothesized in the I-PACE model. (shrink)

It is now over 15 years since Hilary Putnam first urged that we take the “narrow path” of internal realism as a way of navigating between “the swamps of metaphysics and the quicksands of cultural relativism and historicism” (1983, p. 226). In the opening lines of the Preface toRealism with a Human Face, a collection of Putnam's recent papers edited by James Conant, Putnam reaffirms his allegiance to this narrow path, unmoved by Realist murmurings from the swamps and laconic (...) Rortian suggestions that only the quicksands are a proper metaphilosophical abode for those willing to confront our lack of epistemological and metaphysical foundations. If there are changes to be discerned in these writings, Putnam avers, they pertain only to the burden allotted to different considerations in the overall economy of his argument: “It might be said that the difference between the present volume and my work prior toThe Many Faces of Realismis a shift in emphasis: a shift from emphasizing model-theoretic arguments against metaphysical realism to emphasizing conceptual relativity” (p. xi). (shrink)

In this paper we define Martin-L¨of complexes to be algebras for monads on the category of (reflexive) globular sets which freely add cells in accordance with the rules of intensional Martin-L¨of type theory. We then study the resulting categories of algebras for several theories. Our principal result is that there exists a cofibrantly generated Quillen model structure on the category of 1-truncated Martin-L¨of complexes and that this category is Quillen equivalent to the category of groupoids. In particular, 1-truncated Martin-L¨of (...) complexes are a model of homotopy 1-types. In order to establish these facts we give a proof-theoretic analysis, using a modified version of Tait’s logical predicates argument, of the propositional equality classes of terms of identity type in the 1-truncated theory. (shrink)

It is argued that the version of Hilary Putnam's model-theoretic argument developed by Barry Taylor in Models, Truth and Realism poses no threat to the realist claim that an ideal theory may be false.

The major argument against Ramsey-style epistemic structural realism is the model-theoretic refinement of Newman’s objection against Russell, presented in Ketland : 409–424, 2004), where a technical result is interpreted as showing that the Ramsey-sentence approach collapses into instrumentalism. This paper addresses some questions raised by the application of model theory to the scientific realism debate. Firstly, I will suggest three different formal semantics for the positions in the debate. Then, some technicalities of Ketland’s result will be (...) scrutinized in light of comments by Zahar and Demopoulos. Finally, I will formalize Ketland’s argument by means of an intensional operator and focus on one problematic premise. The conclusion is that, with some adjustments, the Ramsey-sentence approach can represent an intermediate position between realism and instrumentalism, but the term “structuralism” does not suit it well. (shrink)

I show that words with indefinite implicit complements occasion a dilemma for their model theory. There has been only two previous attempts to address this problem, one by Fodor and Fodor (1980) and one by Dowty (1981). Each requires that any word tolerating an implicit complement be treated as ambiguous between two different lexical entries and that a meaning postulate or lexical rule be given to constrain suitably the meanings of the various entries for the word. I show that (...) the positing of such an ambiguity runs counter to the facts and propose an alternative solution which does not appeal to ambiguity, meaning postulates or lexical rules. Indeed, I show that the dilemma posed by indefinite implicit complements is posed by all implicit complements and that a general solution to the problem of implicit complements follows from an independently motivated, single treatment of five other problems, that of subcategorization, that of phrasal projections of words, that of defining a model theoretic structure for phrase structure grammars, that of complement polyvalence and that of complement polyadicity. (shrink)

I present two generalizations of Putnam's model-theoretic argument against realism. The first replaces Putnam's model theory with some new, and substantially simpler, model theory, while the second replaces Putnam's model theory with some more accessible results from astronomy. By design, both of these new arguments fail. But the similarities between these new arguments and Putnam's original arguments illuminate the latter's overall structure, and the flaws in these new arguments highlight the (...) corresponding flaws in Putnam's arguments. (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)