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For Reid, sensations do not enter into the analysis of perception proper. Instead they “intervene” between the effects of bodily qualities on our sense organs and our perception of those qualities (Inq VI xxi, 174).1 The question addressed in this essay is: What sort of thing does Reid take this interloper to be?2 The answer defended is that sensations are reflexive mental acts, i.e., acts which take themselves as objects.

Thomas Reid’s epistemological ambitions are decisively at the center of his work. However, if we take such ambitions to be the whole story, we are apt to overlook the theory of mind that Reid develops and deploys against the theory of ideas. Reid’s philosophy of mind is sophisticated and strikingly contemporary, and has, until recently, been lost in the shadow of his other philosophical accomplishments. Here I survey some aspects of Reid’s theory of mind that I find most interesting. I examine whether Reid is a mysterian about the mind, whether Reid has a direct realist theory of perception, and whether Reid has a higher-order, or “inner-sense,” view of consciousness. Along the way I will mention portions of the secondary literature that examine these aspects and point out whether and to what degree I part ways with the interpretations present in the literature.

Direct Realism often emerges as a solution to a certain type of problem. Hume and, especially, Berkeley, wielding some of the most powerful arguments of 18th Century philosophy, forcefully attacked the notion that there could be good inferences from the occurrence of one’s sensations to the existence of external, mind-independent bodies (material objects). Given the success of these attacks, and also given the assumption, made by Berkeley and arguably by Hume as well, that our knowledge of and rational belief in the existence of material objects would depend upon there being such good inferences, a problem arises: We cannot know of or rationally believe in the existence of material objects. Reid’s Direct Realism then emerges as the solution to this problem. Reid admits the success of Berkeley’s and Hume’s attacks against the possibility of successfully grounding our material world beliefs on inferences from our sensations,[1] but claims that our belief in the existence of material objects can be perfectly rationally acceptable, and can amount to knowledge, despite the lack of such inferences. Though he did not use the terminology, it seems to be Reid’s position – and it’s this position that I will be referring to as his “Direct Realism” here – that certain perceptual beliefs whose content is such that they imply the existence of material objects are properly basic: they are rationally held, and if true can amount to knowledge, without having to be based on any other beliefs, including, most notably, beliefs about one’s own sensory experiences.

Thomas Reid's distinction between original and acquired perception is not merely metaphysical; it has psychological and phenomenological stories to tell. Psychologically, acquired perception provides increased sensitivity to features in the environment. Phenomenologically, Reid's theory resists the notion that original perception is exhaustive of perceptual experience. James Van Cleve has argued that most cases of acquired perception do not count as perception and so do not pose a threat to Reid's direct realism. I argue that acquired perception is genuine perception and as direct as original perception. Perception is grounded in a productive and developing relationship between the mind and world.

Thomas Reid thought of himself as a critic of the representative theory of perception, of what he called the ‘theory of ideas’ or ‘the ideal theory’.2 He had no kind words for that theory: “The theory of ideas, like the Trojan horse, had a specious appearance both of innocence and beauty; but if those philosophers had known that it carried in its belly death and destruction to all science and common sense, they would not have broken down their walls to give it admittance.”3 Many have supposed that his opposition to the representative theory was grounded in his direct realism.4 A direct realist theory of perception holds that perception of external objects is not mediated by any mental entity whose intrinsic character licenses a move from the mental entity to the external object presented in perception. Reid himself, in an oration of 1759, delivered at graduation ceremonies over which he presided as regent and professor of philosophy at King’s College in Aberdeen, said that he did not “understand what need there is of an intermediate object for thought about something to be possible.”5 Hence, if Reid was not a direct realist, philosophers and historians would have to ask whether and to what degree Reid was what he thought himself to be.

1. Introduction. Like other direct realists, Thomas Reid offered an alternative to indirect realist and idealist accounts of perception. Reids alternative aimed to preserve the indirect realists commitment to realism about the objects of perception, and the idealists commitment to the immediacy of the minds relation to the objects of perception. Reid holds that what you perceive is mind independent or external; and your relation to such objects in perception is direct or immediate. In his own words, something which is extended and solid, which may be measured and weighed, is the immediate object of my touch and sight. And this object I take to be matter, and not an idea (IP II xi, 154).

According to Reid, “the external senses have a double province; to make us feel and to make us perceive.”1 This essay is about the relation of the feeling and the perceiving. The central question is, What does Reid think feelings, or sensations, are doing in the process of perception? Reid’s answer is well-known: sensations function in perception as natural signs of perceived qualities. The answer, however, is not as well-explained, either by Reid or the secondary literature. Reid’s own comments on the sign theory are occasional and their interrelations are neither obvious nor clarified. The literature on the sign theory has yet to recognize and analyze the significance of a cluster of Reid’s distinctions—between original and acquired perception, general and particular principles of our constitution, and relative and absolute conceptions.2 This paper aims to put these pieces together into a systematic interpretation of the sign theory which reveals its overall rationale, structure, and coherence.

Reid's theory of perception has long been cited as a paradigmatic example of direct realism; and the term “direct” undoubtedly carries the connotation that external objects are items in “the manifold of intuition.” There are important ways in which perception, on Reid's analysis, undoubtedly is immediate and direct. Nonetheless, this paper contends that, with the exception of his account of our perception of visible fi gure, Reid's theory is not an example of direct realism, if a condition of a theory of percep- tion's being a direct realist theory is that it hold that perception yields acquaintance with external objects, so that those objects are present to consciousness. The defense given in Thomas Reid and the Story of Epistemology of the no-acquaintance interpretation of Reid's theory occurred in the context of a comprehensive account of Reid's theory of perception, and was accordingly brief. This essay places that interpretation in the center of attention so as to offer a more adequate defense, developing somewhat more fully the arguments briefly presented in the book, and adding some additional considerations.

For Reid, the external senses have a “double province.” They give rise to both sensation and perception. This essay is about the relation of sensation and perception, a relation Reid’s sign theory of sensations describes. Drawing on Reid’s distinctions between general and particular principles of our constitution, relative and absolute conceptions, and original and acquired perception, the paper systematizes Reid’s sporadic comments on the sign theory. The aim is to offer an interpretation which reveals the overall structure, rationale and coherence of Reid’s sign theory.

In this paper I develop and defend the thesis that there is a problem with Reid’s direct realism. I also think there is a solution to Reid’s problem, and that, in one passage, Reid has the solution in mind, though he never develops it in detail. But developing and defending Reid’s solution to the problem is the task of a second paper. The task of this paper is to show that Reid is committed to the direct realist thesis (DRT) mind-independent bodily qualities are among the immediate objects of perception; and that this thesis proves incompatible with Reid's sign theory of sensations (STS) sensations function as natural signs of bodily qualities in perception. My thesis bears argument due to the persistence of a dispute among Reid’s readers as to whether he endorsed the DRT, and if so whether it is indeed at odds with the STS. Some argue that Reid endorsed both theses, but that they are not at odds; others argue that the theses are at odds but that Reid did not endorse both; and, most recently, some have argued that Reid rejects the DRT, but not because it conflicts with the STS. My claim that he endorsed both theses and that they are at odds is itself at odds with each of these interpretive camps.