Online research in philosophy

A prominent but poorly understood domain of human agency is mental action, i.e., thecapacity for reaching specific desirable mental statesthrough an appropriate monitoring of one's own mentalprocesses. The present paper aims to define mentalacts, and to defend their explanatory role againsttwo objections. One is Gilbert Ryle's contention thatpostulating mental acts leads to an infinite regress.The other is a different although related difficulty,here called the access puzzle: How can the mindalready know how to act in order to reach somepredefined result? A crucial element in the solutionof these puzzles consists in making explicit thecontingency between mental acts and mentaloperations, parallel to the contingency betweenphysical acts and bodily movements. The paper finallydiscusses the kind of reflexivity at stake in mentalacts; it is shown that the capacity to refer tooneself is not a necessary condition of the successfulexecution of mental acts.

This chapter develops a simple theory of introspection on which a mental state is introspectively accessible just by virtue of the fact that one is in that mental state. This theory raises two questions: first, a generalization question: which mental states are introspectively accessible; and second, an explanatory question: why are some mental states introspectively accessible, rather than others, or none at all? In response to the generalization question, I argue that a mental state is introspectively accessible if and only if it is phenomenally individuated. And in response to the explanatory question, I argue that a mental state is introspectively accessible if and only if it is among the determinants of justification. This provides the basis of an argument for a phenomenal conception of justification, according to which a mental state is among the determinants of justification if and only if it is phenomenally individuated.

The topic of introspection stands at the interface between questions in epistemology about the nature of self-knowledge and questions in the philosophy of mind about the nature of consciousness. What is the nature of introspection such that it provides us with a distinctive way of knowing about our own conscious mental states? And what is the nature of consciousness such that we can know about our own conscious mental states by introspection? How should we understand the relationship between consciousness and introspective self-knowledge? Should we explain consciousness in terms of introspective self-knowledge or vice versa? Until recently, questions in epistemology and the philosophy of mind were pursued largely in isolation from one another. This volume aims to integrate these two lines of research by bringing together fourteen new essays and one reprinted essay on the relationship between introspection, self-knowledge, and consciousness.

Alas, things are not quite so simple. As James implies, the term ‘introspection’ literally means ‘looking within’, but of course we do not visually inspect the interiors of our crania. What unites proponents of introspection is the claim that we can recognize our own mental states through some sort of attention—a non-visual ‘looking’—whose immediate objects are thoughts or sensations within oneself, in a non-spatial sense of ‘within’. (The term ‘introspection’ is occasionally given an ecumenical gloss, to refer to any method of knowing one’s own mental states, and not just self-directed attention. But the more restrictive use is standard, and provides the topic of the current entry.) As we will see, some contemporary philosophers and psychologists doubt that any such introspective process underlies self-knowledge.

William of Ockham held in his career two different theories about the nature of concepts. According to the first theory, concepts are forged by the mind and "terminate" the mental acts which produce them. This so called "fictum"-theory was abandoned, and Ockham held another theory, according to which concepts are identified with the mental acts themselves. While I think this is a correct description of the evolution of his philosophy, there is one aspect that has gone so far (almost) unnoticed : in his later theory, not only concepts do not terminate mental acts, but nothing seems fit to play this role. Mental acts are no longer "terminated" by anything. Therefore, as the theory of concepts changes, there is also a change in the theory of mental acts. This last change explains the disappearance of the vocabulary associated with the verb "terminare" in the exposition of the mental act theory.

We falter and stammer when trying to describe our own mental acts. Many mental acts, including thinking, are what the author calls ‘chain-undertakings’, that is, courses of action with some over-arching purpose governing the moment-by-moment sub-acts of which we are introspectively aware. Hence the intermittency and sporadicness of the passage of mental activity which constitutes thinking about something.

The notion of introspection is unparsimonious and unnecessary to explain the experiential grounding of our mentalistic concepts. Instead, we can look at subtle proprioceptive experiences, such as the experience of agency in planning motor acts, which may be explained in part by the phenomenon of collateral discharge or efference copy. Proprioceptive sensations experienced during perceptual and motor activity may account for everything that has traditionally been attributed to a special mental activity called “introspection.”.