Locke’s argument for the primary-secondary quality distinction is compared with Descartes’s argument (in the Principles of Philosophy) for the distinction between mechanical modifications and sensible qualities. I argue that following Descartes, Locke’s argument for the primary-secondary quality distinction is an essentially a priori argument, based on our conception of substance, and the constraints on intelligible bodily interaction that this conception of substance sets.

In philosophical discussions of the secondary qualities, color has taken center stage. Smells, tastes, sounds, and feels have been treated, by and large, as mere accessories to colors. We are, as it is said, visual creatures. This, at least, has been the working assumption in the philosophy of perception and in those metaphysical discussions about the nature of the secondary qualities. The result has been a scarcity of work on the “other” secondary qualities. In this paper, I take smells and (...) place them front and center. I ask: What are smells? For many philosophers, the view that colors can be explained in purely physicalistic terms has seemed very appealing. In the case of smells, this kind of nonrelational view has seemed much less appealing. Philosophers have been drawn to versions of relationalism—the view that the nature of smells must be explained (at least in part) in terms of the effects they have on perceivers. In this paper, I consider a contemporary argument for this view. I argue that nonrelationalist views of smell have little to fear from this argument. (shrink)

In theorizing about perception, philosophers have often multiplied qualities. To perceptible qualities of external objects, like colors and shapes (‘sensible’ qualities), have been added qualities of experiences (‘sensory’ qualities) or of sense-data (‘sensational’ qualities). Start with sensory qualities. The phrase ‘sensory quality’ is not much in use these days, having lost out to ‘phenomenal character,’ ‘phenomenal property,’ ‘qualitative character,’ or ‘quale.’ But whatever sensory qualities are called, pinning them down is no easy matter.

Colors aren't as real as shapes. Shapes are full?fledged qualities of things in themselves, independent of how they're perceived and by whom. Colors aren't. Colors are merely qualities of things as they are for us, and the colors of things depend on who is perceiving them. When we take the fully objective view of the world, things keep their shapes, but the colors fall away, revealed as the mere artifacts of our own subjective, parochial perspective on the world that they (...) are. (shrink)

The paper presents a novel account of nature and genesis of some philosophical problems, which vindicates a new approach to an arguably central and extensive class of such problems: The paper develops the Wittgensteinian notion of ‘philosophical pictures’ with the help of some notions adapted from metaphor research in cognitive linguistics and from work on unintentional analogical reasoning in cognitive psychology. The paper shows that adherence to such pictures systematically leads to the formulation of unwarranted claims, ill-motivated problems, and pointless (...) theories. To do so, the paper proceeds from a case-study on a lastingly influential development in early modern philosophy: the adoption of the doctrine of secondary qualities, and its principal consequences. The findings motivate a new approach to an arguably extensive and important class of philosophical problems: to the problems we raise in the grip of philosophical pictures. (shrink)

Frank Jackson formulated his knowledge argument as an argument for dualism. In this paper I show how the argument can be modified to also establish the irreducibility of the secondary qualities to the properties of physical theory, and ultimately "secondary quality eliminativism"- the view that the secondary qualities are physically uninstantiated.

in The Cambridge Companion to Locke’s Essay, edited by Lex Newman. Cambridge: Cambridge University Press, 2007.

Locke asserts that “the Ideas of primary Qualities of Bodies, are Resemblances of them, and their Patterns do really exist in the Bodies themselves; But the Ideas, produced in us by these Secondary Qualities, have no resemblance of them at all.”1 On an unsophisticated way of taking his words, he means that ideas of primary qualities are like the qualities they represent and ideas of secondary qualities are unlike the qualities they represent.2 I will show that if we take his (...) assertions in this unsophisticated way, our reward will be a straightforward and satisfying interpretation of the central arguments of his chapter on primary and secondary qualities. With these arguments, Locke attempts to justify his assertions about resemblance. Some may be skeptical, thinking that the assertions, interpreted literally, are either too absurd or too obvious to have reasons supporting them. I take this skepticism to rest on deep foundations of charity, so half of the paper will be devoted to undermining these foundations by giving a sympathetic and historical exposition of Locke’s positive thesis that primary qualities resemble the ideas that represent them. I criticize rival interpretations of Lockean resemblance, say what it means to believe that ideas resemble qualities, explain the plausibility of the belief in Locke’s environment, and examine his descriptions of how ideas resemble particular primary qualities. Once I establish that we should take Locke’s resemblance theses literally, I can describe their place in his theory of representation. After that, I can describe his reasons for believing the resemblance theses. I will conclude by showing how Locke’s belief that ideas of secondary qualities do not resemble anything in bodies leads him to conclude that secondary qualities are merely powers to produce ideas. Let me begin near the end, however. Before defending a literal interpretation of the resemblance theses, I want to criticize three rival interpretations.. (shrink)

Our perceptual systems make information about the world available to our cognitive faculties. We come to think about the colors and shapes of objects because we are built somehow to register the instantiation of these properties around us. Just how we register the presence of properties and come to think about them is one of the central problems with understanding perceptual cognition. Another problem in the philosophy of perception concerns the nature of the properties whose presence we register. Among the (...) perceptible properties are colors and shapes, for example, and there is a long philosophical tradition of drawing and refusing to draw metaphysical distinctions between them. This paper makes a claim about the information-theoretic approach to perceptual cognition in order to argue for a fundamentally epistemological distinction between colors and shapes. What makes shapes and colors seem so different to us is how we carry information about their presence around us. In particular, we can come to know more about the shapes on the basis of perceiving them than we can come to know about the colors. One interesting feature of how this distinction is drawn is that it partially vindicates Locke’s claim that our ideas of primary qualities like shapes resemble them in ways our ideas of colors do not. (shrink)

Many philosophers have maintained that secondary qualities are private mental entities. In this paper I use the discussions of H. A. Prichard, Berkeley and G. E. Moore on the status of secondary qualities to bring out the assumptions that underlie this view. One of these is that secondary qualities are particular. I show that Prichard holds these assumptions and then I attempt to diagnose why he holds them. In the course of this diagnosis I explore several senses of 'dependent' which (...) play a role in this view. Finally, I show that a causal dependence of secondary qualities upon the perceiver will not lead to the conclusion that secondary qualities are private unless the philosophical thesis that they are particular is already assumed. (shrink)

McDowell, responding to Mackie’s argument from queerness, defended realism about values by analogy to secondary qualities. A certain tension between two interpretations of McDowell’s response is highlighted. According to one, realism about values would indeed be vindicated, but at the cost of failing to provide an appropriate response to Mackie’s argument; whereas according to the other, McDowell does provide an adequate response, but evaluative realism is jeopardized.

What is the relationship between color experience and color? Here, I defend the view that it is semantic: color experience denotes color in a code innately known by the perceiver. This semantic theory contrasts with a variety of theories according to which color is defined as the cause of color experience (in a special set of circumstances). It also contrasts with primary quality theories of color, which treat color as a physical quantity. I argue that the semantic theory better accounts (...) for the kinds of knowledge we have regarding both the color of objects that we see and of the colors themselves. (shrink)

An important part of the mind-brain problem arises because sentience and consciousness seem inherently resistant to scientific explanation and understanding. The solution to this dilemma is to recognize, first, that scientific explanation can only render comprehensible a selected aspect of what there is, and second, that there is a mode of explanation and understanding, the personalistic, quite different from, but just as viable as, scientific explanation. In order to understand the mental aspect of brain processes - that aspect we know (...) about as a result of having relevant neurological processes occur in our own brain - we need to avail ourselves of personalistic explanation, irreducible to scientific explanation. The problem of explaining and understanding why experiential or mental aspects of brain processes or things should be correlated with certain physical processes, things or states of affairs is a non-problem because there is no kind of explanation possible in terms of which an explanation could be couched. A physical theory, amplified to include the experiential, might be predictive but would, necessarily, cease to be explanatory; and an amplified personalistic explanation could not succeed either. There is, in short, an explanation as to why there cannot be an explanation of correlations between physical and mental aspects of processes going on inside our heads. (shrink)

This book investigates the subjective and objective representations of the world, developing analogies between secondary qualities and indexical thoughts and arguing that subjective representations are ineliminable. Throughout, McGinn brings together historical and contemporary discussions to illuminate old problems in a novel way.

Reid offers an under-appreciated account of the primary/secondary quality distinction. He gives sound reasons for rejecting the views of Locke, Boyle, Galileo and others, and presents a better alternative, according to which the distinction is epistemic rather than metaphysical. Primary qualities, for Reid, are qualities whose intrinsic natures can be known through sensation. Secondary qualities, on the other hand, are unknown causes of sensations. Some may object that Reid's view is internally inconsistent, or unacceptably relativistic. However, a deeper understanding shows (...) that it is consistent, and relative only to normal humans. To acquire this deeper understanding, one must also explore the nature of dispositions, Reid's rejection of the theory of ideas, his distinction between sensation and perception, and his distinction between natural and acquired perceptions. (shrink)

Secondary and tertiary qualities are plausibly explained along dispositionalist lines. Concepts of such qualities are response-dependent, denoting properties that are partly mind/brain-dependent. Unfortunately, dispositionalism is hard to square with extant versions of naturalistic theories of representation. In particular the standard naturalistic (indicational) semantics of representational content cannot handle the question from either the subjectivist or the dispositional viewpoint. The paper proposes a remedy: the problem can be solved in a smooth and natural way, provided that we revise and supplement the (...) standard semantics in a rather obvious fashion, by allowing the mind/brain-involving properties to figure within it. (shrink)

In this paper, I argue that Book II, Chapter viii of Locke' Essay is a unified, self-consistent whole, and that the appearance of inconsistency is due largely to anachronistic misreadings and misunderstandings. The key to the distinction between primary and secondary qualities is that the former are, while the latter are not, real properties, i.e., properties that exist in bodies independently of being perceived. Once the distinction is properly understood, it becomes clear that Locke's arguments for it are simple, valid (...) and (in one case) persuasive as well. (shrink)

It seems almost a truism to say that colour is a sensation; and yet Young, by honestly recognizing this elementary truth, established the first consistent theory of colour. So far as I know, Thomas Young was the first who, starting from the well-known fact that there are three primary colours, sought for the explanation of this fact, not in the nature of light, but in the constitution of man. (James Clerk Maxwell, p. 267.)It is doubtless scientific to disregard certain aspects (...) when we work; but to urge that therefore such aspects are not fact, and that what we use without them is an independent real thing-this is barbarous metaphysics. (F. H. Bradley, p. 15.). (shrink)