Víctor M. Verdejo

ABSTRACT Ordinary thinkers are not only capable of keeping hold of the same thought across contexts via shifts in the way of thinking. They also possess the ability to do so in a manner that grounds disagreement with respect to other thoughts. In this paper, I elucidate the ensuing phenomenon of dynamic disagreement and introduce the type of account most likely to accommodate its distinctive features. I argue, in particular, that dynamic disagreement requires the postulation of dynamic concepts or concepts that display a number of ways of thinking in different contexts. Finally, I suggest that alternative approaches to dynamic thought face difficulty in fully capturing the phenomenon.

Subjects suffering from extreme peripheral deafferentation can recruit vision to perform a significant range of basic physical actions with limbs they can’t proprioceptively feel. Self-ascriptions of deafferented action – just as deafferented action itself – fundamentally depend, therefore, on visual information of limb position and movement. But what’s the significance of this result for the concept of self patently at work in these self-ascriptions? In this paper, I argue that these cases show that bodily awareness grounding employment of the self-concept in self-ascriptions of action can be fundamentally third-personal and concern a body that is not presented as one’s own, but as an object among others.

Many scholars are ready to accept that first person thought involves a special way w such that, for any thinker x, only x can access the first person way w of thinking about x. Standard articulations of this Frege-inspired view involve a rejection of the strict shareability of first person thought. I argue that this rejection eventually forces us to renounce an intuitively plausible characterisation of communication, and specifically, disagreement. This result invites us to explore alternative articulations which, still within an overall Fregean framework, may better explain how first person thoughts reach out into a public, shareable dimension. Here I shape this possibility in terms of perspectives, i.e. ways of thinking that do not individuate concepts or thoughts. Perspectives, I submit, can serve to unproblematically accommodate basic disagreement in indexical cases and to outline the dynamic character of first person thought.

Consider the Unshareability View, namely, the view that first person thought or self-thought—thought as typically expressed via the first person pronoun—is not shareable from subject to subject. In this article, I show that a significant number of Fregean and non-Fregean commentators of Frege have taken the Unshareability View to be the default Fregean position, rehearse Frege’s chief claims about self-thought and suggest that their combination entails the Unshareability View only on the assumption that there is a one-to-one correspondence between way of thinking and thought-individuating cognitive value, outline an account of self-thought that rejects the assumption and keeps intact all of Frege’s chief claims, and respond to a number of worries to the effect that this proposal yields undesirable results from the point of view of the individuation of self-thought at the level of cognitive value.

Marr’s celebrated contribution to cognitive science (Marr 1982, chap. 1) was the introduction of (at least) three levels of description/explanation. However, most contemporary research has relegated the distinction between levels to a rather dispensable remark. Ignoring such an important contribution comes at a price, or so we shall argue. In the present paper, first we review Marr’s main points and motivations regarding levels of explanation. Second, we examine two cases in which the distinction between levels has been neglected when considering the structure of mental representations: Cummins et al.’s distinction between structural representation and encodings (Cummins in Journal of Philosophy, 93(12):591–614, 1996; Cummins et al. in Journal of Philosophical Research, 30:405–408, 2001) and Fodor’s account of iconic representation (Fodor 2008). These two cases illustrate the kind of problems in which researchers can find themselves if they overlook distinctions between levels and how easily these problems can be solved when levels are carefully examined. The analysis of these cases allows us to conclude that researchers in the cognitive sciences are well advised to avoid risks of confusion by respecting Marr’s old lesson

Subjects experiencing thought insertion disown thoughts they are introspectively aware of. According to what I call “the rationality hypothesis”, thought-insertion reports are not merely intelligible, but also express, or potentially express, fully rational judgments in the light of highly disruptive experience. I argue that the hypothesis is ethically and theoretically motivated, and provides two insights into the philosophical significance of reports by subjects with schizophrenia. First, the reports can be seen as evidence that rational judgments of ownership of a thought prioritize agency awareness over introspective awareness of it. This point fits with an integrative account of thought insertion at the personal and mechanistic levels. Second, rational and competent uses of the first person purely based on introspection do not necessarily involve a full-fledged first-person perspective over one’s thoughts. This suggests that agency awareness, and not introspection as such, is primarily involved in determining the reference of the first person featuring in the judgments.