Owens (1993) argues that a tension exists between our commonsense view of mental states and the scientific view that psychological explanations not contradict supervenience. He suggests that one cannot accept the anti-individualistic conclusions of Twin-Earth thought experiments and continue to use folk psychological states to explain behavior. I argue that his conclusions are based on individuating content widely and causal powers narrowly, and that such individuation violates consistency assumptions about the terms of his discussion. Thus, I argue, the tension he points to evaporates when we adopt either a consistently wide view or a consistently narrow view.

Within the past decade there has grown an acute and highly articulate group of critics of the orthodox interpretation of quantum theory,—the so-called “Copenhagen Interpretation.” The writings of people like Bopp, Janossy, and particularly Bohm and Feyerabend, must be taken very seriously indeed. The future of some important discussions in the philosophy and the logic of science rests with these individuals. But they have, in their own writings, occasionally matched the inelegancies of Bohr and Heisenberg with as many inelegancies of their own. The present paper is meant to present a quintet of considerations which may possibly lead to a reassessment of the issues between Bohr, Heisenberg, and their critics, especially Bohm and Feyerabend.

There is a widespread impression that General Relativity, unlike Quantum Mechanics, is in no need of an interpretation. I present two reasons for thinking that this is a mistake. The first is the familiar hole argument. I argue that certain skeptical responses to this argument are too hasty in dismissing it as being irrelevant to the interpretative enterprise. My second reason is that interpretative questions about General Relativity are central to the search for a quantum theory of gravity. I illustrate this claim by examining the interpretative consequences of a particular technical move in canonical quantum gravity.

This article investigates epistemological aspects of scientists’ reuse of empirical data over decades and centuries. Giving examples, I discuss three respects in which empirical data are historical entities and the implications for the notion of data reuse. First, any data reuse necessitates metadata, which specify the data’s circumstances of origin. Second, interpretation of historical data often requires the tools of humanities disciplines, which produce a further historicization of data. Finally, some qualitative social scientists hold that data are personal to the researcher who coconstructs them in the research process and are therefore skeptical about the prospects of reusing data.

In this paper, I answer a fundamental question facing any view according to which natural selection is a population-level causal process—namely, how is the causal process of natural selection related to, yet not preempted by, causal processes that occur at the level of individual organisms? Without an answer to this grounding question, the population-level causal view appears unstable—collapsing into either an individual-level causal interpretation or the claim that selection is a purely formal, statistical phenomenon. I argue that a causal account of realization provides an answer to the grounding question. By applying this account of realization to the natural selection of melanism in rock pocket mice, I show how an alternative, formal account of realization, favored by proponents of the statistical interpretation, misses biologically important features. More generally, this paper shows how metaphysical issues about realization normally discussed in the philosophy of mind apply to debates in philosophy of biology. Thus, it is a first step toward fleshing out the oft-noted similarities between debates in these areas.

In a survey of information theory and some of its implications, Warren Weaver has proposed a distinction between engineering (or channel) noise and semantic noise (1: 94–117). Ordinary Spanish usage reflects this distinction quite neatly. If A speaks to B and B responds with no entiendo, it means ‘I have not heard your words, because of interfering sound or lack of attention; please transmit the same message again’; if he responds with no comprendo, it means ‘I heard you all right, but what I heard doesn't make sense; please paraphrase or explain.’ Channel noise, thus, is the responsible factor when that which leaves a transmitter is not that which reaches the receiver; semantic noise is a discrepancy between the codes used by transmitter and receiver.

Is there anything more to temperature than the ordering of things from colder to hotter? Are there also facts, for example, about how much hotter (twice as hot, three times as hot, etc.) one thing is than another? There certainly are, but the only strong justification for this claim comes from statistical mechanics. What we knew about temperature before the advent of statistical mechanics (what we knew about it from thermodynamics) provided only weak reasons to believe it.

The laws of nature have an internal explanatory structure. This leads to interesting questions for metaphysicians of laws. What is the nature of this explanation? Marc Lange has recently argued in favor of metalaws: higher-order laws governing other laws, of which symmetry principles may be an example. Lange argues that his view, unlike its competitors, can make sense of the explanatory power of symmetries. I agree with Lange about the explanatory structure of laws but disagree with him about the nature of this explanation. I then present a Humean view that neatly captures the explanatory power of symmetry principles.

In a recent note ([3]) Roger Carlson presented a rather negative appraisal of my treatment of the logic of Fisherian significance testing in [10]. The main issue between us involves Carlson's thesis that, within the limits set by Fisher, standard significance tests are valuable tools of data analysis as they stand, i.e., without modification of the structure of the reasoning they employ. Call this the adequacy thesis. In my paper I argued that (i) the pattern of reasoning employed by tests of significance needs to be justified in spite of its unquestioned acceptance by most researchers, (ii) The best justification offered to date—by R. A. Fisher—is seriously defective. Therefore (iii) the adequacy thesis is not justified. I proposed some alterations of the pattern of reasoning employed by tests of significance and argued that they guarantee that tests are adequate epistemological tools.

A major theme in biological research is the quest for mechanism, embodied in explanatory reductionism: the interpretation of phenomena through links to the entities and laws of more fundamental sciences. For example, the form of Starling's Law of the Heart, relating contractile force to heart volume, follows from the sliding-filament hypothesis of muscle contraction, a molecular concept. Although alternative mechanisms for muscle contraction and cardiac regulation could be deduced from biochemical principles, the formulation provides clear correspondence with the phenomena and a deeper understanding of cardiac function. Moreover, even if the reduction provides no better formulation of the phenomenon, of the macro-regularity, it is still prized as a nearer approach to physical reality, as a step toward realizing fundamental unities and codifying general principles, and as a door to new experimental opportunities.

This paper explores the status of the von Neumann-Lüders state transition rule (the “projection postulate”) within “real-logic” quantum logic. The entire discussion proceeds from a reading of the Lüders rule according to which, although idealized in applying only to “minimally disturbing” measurements, it nevertheless makes empirical claims and is not a purely mathematical theorem. An argument (due to Friedman and Putnam) is examined to the effect that QL has an explanatory advantage over Copenhagen and other interpretations which relativize truth-value assignments to experimental arrangements. Two versions of QL, the lattice-theoretic (LT) and partial-Boolean-algebra (PBA), are considered. It turns out that the projection postulate is intimately connected with the choice of conditional connective for QL. The effect of the projection postulate is obtained with the Sasaki conditional. However, this choice is found to require extra assumptions, on both the LT and PBA versions, which are either just as ad hoc as the projection postulate itself or indefensible from within the real-logic QL framework.

Color constancy is a foundational and yet puzzling phenomenon. Standard appearance invariantism is threatened by the psychophysical matching argument, which is taken to favor variantism. This argument, however, is inconclusive. The data at best support a pluralist view: color constancy is sometimes variantist, sometimes invariantist. I add another potential explanation of these data, complex invariantism, which adopts an atypical six-dimensional model of color appearance. Finally, I prospect for a unifying conception of constancy among two neglected notions: discriminatory color constancy and relational color constancy. The former arguably marks a common core capacity that is present across widely differing viewing contexts.

Natural conditions are provided that are sufficient to ensure that causality as defined by approaches that use counterfactual dependence and structural equations will be transitive.

This paper argues that Information Theoretic Redundancy (ITR) is fundamentally a composite concept that has been continually misinterpreted since the very inception of Information Theory.

We view ITR as compounded of true redundancy and partial redundancy. This demarcation of true redundancy illustrates a limiting case phenomenon: the underlying metric (number of alternatives) differs only by degree but the properties of this concept differ in kind from those of partial redundancy.

Several other studies are instanced which also imply the composite nature of ITR. We thus provide broadly based but particular support for earlier generalized suggestions that it is the underlying calculus of Information Theory rather than the ill-named concepts themselves that provides something of a unitary language for the description of phenomena.

Debiasing procedures are experimental methods aimed at correcting errors arising from the cognitive biases of the experimenter. We discuss two of these methods, the predesignation rule and randomization, showing to what extent they are open to the experimenter’s regress: there is no metarule to prove that, after implementing the procedure, the experimental data are actually free from biases. We claim that, from a contractarian perspective, these procedures are nonetheless defensible since they provide a warrant of the impartiality of the experiment: we only need proof that the result has not been intentionally manipulated for prima facie acceptance.

There has been a long-standing and sometimes passionate debate between physicists over whether a dynamical framework for quantum systems should incorporate not completely positive (NCP) maps in addition to completely positive (CP) maps. Despite the reasonableness of the arguments for complete positivity, we argue that NCP maps should be allowed, with a qualification: these should be understood, not as reflecting ‘not completely positive’ evolution, but as linear extensions, to a system’s entire state space, of CP maps that are only partially defined. Beyond the domain of definition of a partial-CP map, we argue, much may be permitted.

Richard Otte (1985) has recently criticized the resolution of Simpson's paradox given by Nancy Cartwright (1979). He argues that there are difficulties with the version of the theory of probabilistic causality that Cartwright has developed, and that there is a way in which Simpson's paradox can arise that Cartwright's theory cannot handle. And Otte develops his own theory of probabilistic causality. I defend Cartwright's solution, and I argue that there are difficulties with the theory of probabilistic causality that Otte proposes.

Binding specificity is a centrally important concept in molecular biology, yet it has received little philosophical attention. Here I aim to remedy this by analyzing binding specificity as a causal property. I focus on the concept’s role in drug design, where it is highly prized and hence directly studied. From a causal perspective, understanding why binding specificity is a valuable property of drugs contributes to an understanding of causal selection—of how and why scientists distinguish between causes, not just causes from noncauses. In particular, the specificity of drugs is precisely what underwrites their value as experimental interventions on biological processes.

The first part of the paper distinguishes between a real past which has nothing to do with historical events and an historical past made up of hypothetical events introduced for the purpose of explaining historical evidence. Attention is next paid to those so-called ancillary historical disciplines which study historical evidence, and it is noted that the historical event is brought in to explain the particular constellation of different kinds of historical evidence which are judged to belong together. The problem of explaining events is then taken up, and an attempt is made to defend the view that such explanation must presuppose general laws. And this is followed by a discussion, partly speculative, of social-historical laws. The final section of the paper tries to argue that the subjective intentions of individuals are irrelevant to historical explanation.

This paper represents an attempt to indicate the idea of a logic slightly more general than sentential calculus, which is applicable to many philosophical issues. In particular, I shall use this generalized calculus to discuss a variation of the logic of imperatives. In part I, certain general considerations about indicative calculi provide the basis, as well as indicate the need, for the more formal construction of part II. Part III illustrates the analytical power of the tool constructed, and tries to show its relevance for philosophy.