When viewing a circular coin rotated in depth, it fills an elliptical region of the distal scene. For some, this appears to generate a two-fold experience, in which one sees the coin as simultaneously circular (in light of its 3D shape) and elliptical (in light of its 2D ‘perspectival shape’ or ‘p-shape’). An energetic philosophical debate asks whether the latter p-shapes are genuinely presented in perceptual experience (as ‘perspectivalists’ argue) or if, instead, this appearance is somehow derived or inferred from (...) experience (as ‘anti-perspectivalists’ argue). This debate, however, has largely turned on introspection. In a recent study, Morales, Bax, and Firestone (2020) aim to provide the first empirical test of this question. They asked subjects to find an elliptical coin seen face-on from a search array that also included a circular coin seen either face-on or at an angle. They found that subjects reacted more slowly when the distracting circle was seen at an angle, such that it’s p-shape matched that of the target ellipse. From this, they concluded that the similar p-shape between the ellipse and circle constituted a phenomenal similarity between the two, and thus that perspectivalism is true. We show that these results can also be explained by pre-attentive guidance by unconscious representations (in what follows, just “unconscious pre-attentive guidance”) and that this explanation is at least as plausible as one from phenomenal similarity. Thus, we conclude that the experiment does not support perspectivalism over anti-perspectivalism. (shrink)

The first aim of the paper is to show that under certain conditions generative syntax can be made suitable for Montague semantics, based on his type logic. One of the conditions is to make branching in the so-called X-bar syntax strictly binary, This makes it possible to provide an adequate semantics for Noun Phrases by taking them as referring to sets of collections of sets of entities ( type <ett,t>) rather than to sets of sets of entities (ett).

I argue that beliefs based on irresponsibly formed experiences — whose causes were not appropriately regulated by the subject — are doxastically unjustified. Only this position, I claim, accounts for the higher epistemic standard required of perceptual experts. Section I defends this standard and applies it to a pair of cases in which either an expert umpire or a complete novice judge a force play in baseball. I argue that when the latter, but not the former, fails to follow rules (...) about perceiving force plays, their resulting belief is justified. Section II shows that this difference can be explained by the fact that the novice, but not the expert, formed her experience responsibly. Section III shows that alternative explanations of the expert’s unjustified belief — from defeat, reliability, and inference — fail. Section IV shows that the epistemic relevance of responsible experience formation has broad implications for the epistemology of perceptual beliefs. (shrink)

The paper is replaced by a new version (12-2019): DOI: 10.5281/zenodo.3572846 -/- Physical phenomena emerge from the quantum fields everywhere in space. However, not only the phenomena emerge from the quantum fields, the law of the conservation of energy must have its origin from the same spatial structure. This paper describes the relations between the main law of physics and the mathematical structure of the “aggregated” quantum fields.

We prove that all extensions of Heyting Arithmetic with a logic that has the finite frame property possess the de Jongh property.

In consciousness studies, the first-person perspective, seen as a way to approach consciousness, is often seen as nothing but a variant of the third-person perspective. One of the most important advocates of this view is Dennett. However, as I show in critical interaction with Dennett’s view, the first-person perspective and the third-person perspective are different ways of asking questions about themes. What these questions are is determined by the purposes that we have when we ask them. Since our purposes are (...) different according to the perspective we take, each perspective has a set of leading questions of its own. This makes that the first-person perspective is an approach of consciousness that is substantially different from the third-person perspective, and that one cannot be reduced to the other. These perspectives are independent, although complementary approaches of the mind. (shrink)

of “Reason and the structure of Davidson’s ‘Desire-Belief-Model’ ” by Henk bij de Weg In the present discussion in the analytic theory of action, broadly two models for the explanation or justification of actions can be distinguished: the internalist and the externalist model. Against this background, I discuss Davidson’s version of the internalist Desire-Belief Model . First, I show that what Davidson calls “pro attitude” has two distinct meanings. An implication of this is that Davidson’s DBM actually comprises two (...) different models: the “classical” DBM and a model that has an extra premise, the “nonclassical” model. However, from another point of view one can say that the classical DBM is the nonclassical model in which a premise is missing. In order to determine which viewpoint is correct, I introduce Schütz’s distinction between “because-motives” and “in-order-to-motives”. With the help of this distinction, I can show that the classical DBM is an incomplete version of the nonclassical model. Besides of the premise that refers to the agent’s pro attitude, we need this extra premise in order to refer to the occasion as experienced by the agent that makes him or her act. Only then can we fully explain or justify an action. (shrink)

We investigate the theory IΔ 0 + Ω 1 and strengthen [Bu86. Theorem 8.6] to the following: if NP ≠ co-NP. then Σ-completeness for witness comparison formulas is not provable in bounded arithmetic. i.e. $I\delta_0 + \Omega_1 + \nvdash \forall b \forall c (\exists a(\operatorname{Prf}(a.c) \wedge \forall = \leq a \neg \operatorname{Prf} (z.b))\\ \rightarrow \operatorname{Prov} (\ulcorner \exists a(\operatorname{Prf}(a. \bar{c}) \wedge \forall z \leq a \neg \operatorname{Prf}(z.\bar{b})) \urcorner)).$ Next we study a "small reflection principle" in bounded arithmetic. We prove that for (...) all sentences φ $I\Delta_0 + \Omega_1 \vdash \forall x \operatorname{Prov}(\ulcorner \forall y \leq \bar{x} (\operatorname{Prf} (y. \overline{\ulcorner \varphi \urcorner}) \rightarrow \varphi)\urcorner).$ The proof hinges on the use of definable cuts and partial satisfaction predicates akin to those introduced by Pudlak in [Pu86]. Finally, we give some applications of the small reflection principle, showing that the principle can sometimes be invoked in order to circumvent the use of provable Σ-completeness for witness comparison formulas. (shrink)

One of the currently most discussed themes in the philosophy of action is whether there is some kind of collective intention that explains what groups do independent of what the indi-viduals who make up the group intend and do. One of the main obstacles to solve this prob-lem is that on the one hand collective intentionality is no simple summation, aggregate, or dis-tributive pattern of individual intentionality (the Irreducibility Claim), while on the other hand collective intentionality is in the heads (...) of the participating individuals, so to speak, and so it is owned by each of the separate individuals who make up the group (the Individual Ownership Claim). The claims are contradictory and until now no satisfactory solution how to reconcile them has been found. In this article I argue that the constitution view, like the one developed by Lynne R. Baker, can provide a way to sidestep the contradiction. Just as a statue as such is constituted by the marble it is made of but has characteristics that are different from the mar-ble (a statue has a head and legs, while the marble hasn’t; while the marble is stony and the statue as such isn’t), I argue that a group is constituted by its members and that a group on the one hand and its members on the other hand have different characteristics. This is possible be-cause group and members are on different levels. Then there is no longer a contradiction be-tween the Irreducibility Claim and the Individual Ownership Claim, for the former claim con-cerns the group level and the latter claim concerns the level of the group members. This ex-plains that a group can have intentions that are no simple summation, aggregate, or distributive patterns of the intentions of its members and that group intentions can be different from if not contradictory to what the individual members taken together intend. (shrink)

In his work on reasons Dretske argues that reasons are only worthwhile for having them if they are causally relevant for explaining behaviour, which he elaborates in his representational theory of explanation. The author argues against this view by showing that there are reasons that are relevant for explaining behaviour but not causally relevant. He gives a linguistic foundation of his argumentation and shows that Dretske’s representational theory cannot explain human actions because man does not only perceive things that have (...) already meaning but also assigns meanings to what (s)he perceives and that therefore reasons are fundamentally different from causes. (shrink)

One of the most discussed articles in the theory of knowledge is Edmund Gettier’s article “Is Justified True Belief Knowledge?”, published in 1963. In this article Gettier undermined the view that knowledge is justified true belief. I think that Gettier’s analysis has consequences not only for the question what knowledge is but also for our idea of truth. In this paper I argue that an analysis in the sense of Gettier shows that a statement can be both true and not (...) true at the same time. (shrink)

Thesis (MA)--Stellenbosch University, 2014.

People often do things together and form groups in order to get things done that they cannot do alone. In short they form a collectivity of some kind or a group, for short. But if we consider a group on the one hand and the persons that constitute the group on the other hand, how does it happen that these persons work together and finish a common task with a common goal? In the philosophy of action this problem is often (...) solved by saying that there is a kind of collective intention that the group members have in mind and that guides their actions. Does such a collective intention really exist? In this article I’ll show that the answer is “no”. In order to substantiate my view I’ll discuss the approaches of Bratman, Gilbert and Searle on collective intention. I’ll put forward four kinds of criticism that undermine the idea of collective intention. They apply mainly to Bratman and Gilbert. First, it is basically difficult to mark off smaller groups from bigger unities. Second, most groups change in membership composition over time. Third, as a rule, on the one hand groups are internally structured and on the other hand they belong to a larger structure. It makes that generally it cannot be a collective intention that moves the actions of the members of a group. Fourth, conversely, most individual actions cannot be performed without the existence of a wider context of agents who support these actions and make them possible. My critique on Searle mainly involves that in his approach his idea of collective intention is superfluous and that he is not radical enough in his idea that collective action is based on coordinated individual intentions and actions. However, it is a good starting point for showing how collective action actually functions, especially when combined with Giddens’s structuration theory. Every agent in a group executes his or her own individual intentions, relying on what the group offers to this agent and asks from him or her. In this way individual actions of the members of a group are coordinated and it makes that the group can function and that its goals can be performed. And in this way the group is produced and reproduced by fitting individual actions together. An individual agent who belongs to a group only needs to know what s/he wants and what s/he has to do in the group, even if s/he has no knowledge of the intentions and commitments of the other members. Then he or she can do things together with others in a group without supposing that there is something like a collective intention. (shrink)

The aim of this contribution is to provide an overview of conceptual approaches to incorporating a decision maker’s non-knowledge into economic theory. We will focus here on the particular kind of non-knowledge which we consider to be one of the most important for economic discussions: non-knowledge of possible consequence-relevant uncertain events which a decision maker would have to take into account when selecting between different strategies.

We prove that all extensions of Heyting Arithmetic with a logic that has the finite frame property possess the de Jongh property.

One of the most attractive, but nevertheless highly controversial proposals to alleviate the negative effects of today’s international patent regime is the Health Impact Fund (HIF). Although the HIF has been drafted to facilitate access to medicines and boost pharmaceutical research, we have analysed the burdens for the global poor a similar proposal designed to promote the use and development of climate-friendly technologies would have. Drawing parallels from the access to medicines debate, we suspect that an analogous “Climate Impact Fund” (...) will increase the already very high scientific and technological supremacy of the developed world over the Global South. We advocate countering this dominance on the ground that countries with scarce research and development capacities will be in a difficult position to reject technologies and will not have a say on how such technologies should look like. Further, addressing global hazards should be an inclusive endeavour and not only a privilege reserved for the developed world. Incentivizing grassroots innovation would be a major step to promote scientific and technological inclusion. (shrink)

This is a review of Henk Woldring's book on Karl Mannheim.

Review of Henk de Regt's "Understanding Scientific Understanding".

In this paper, I first outline the view developed in my recent book on the role of idealization in scientific understanding. I discuss how this view leads to the recognition of a number of kinds of variability among scientific representations, including variability introduced by the many different aims of scientific projects. I then argue that the role of idealization in securing understanding distances understanding from truth, but that this understanding nonetheless gives rise to scientific knowledge. This discussion will clarify how (...) my view relates to three other recent books on understanding by Henk de Regt, Catherine Elgin, and Kareem Khalifa. (shrink)

For a classical theory T, ℋ(T) denotes the intuitionistic theory of T-normal (i.e. locally T) Kripke structures. S. Buss has asked for a characterization of the theories in the range of ℋ and raised the particular question of whether HA is an ℋ-theory. We show that Ti∈ range(ℋ) iff Ti = ℋ(T). As a corollary, no fragment of HA extending iΠ1 belongs to the range of ℋ. A. Visser has already proved that HA is not in the range of (...) H by different methods. We provide more examples of theories not in the range of ℋ. We show PA-normality of once-branching Kripke models of HA + MP, where it is not known whether the same holds if MP is dropped. (shrink)

Kripke frames (and models) provide a suitable semantics for sub-classical logics; for example, intuitionistic logic (of Brouwer and Heyting) axiomatizes the reflexive and transitive Kripke frames (with persistent satisfaction relations), and the basic logic (of Visser) axiomatizes transitive Kripke frames (with persistent satisfaction relations). Here, we investigate whether Kripke frames/models could provide a semantics for fuzzy logics. For each axiom of the basic fuzzy logic, necessary and sufficient conditions are sought for Kripke frames/models which satisfy them. It turns out (...) that the only fuzzy logics (logics containing the basic fuzzy logic) which are sound and complete with respect to a class of Kripke frames/models are the extensions of the Gödel logic (or the super-intuitionistic logic of Dummett); indeed this logic is sound and strongly complete with respect to reflexive, transitive and connected (linear) Kripke frames (with persistent satisfaction relations). This provides a semantic characterization for the Gödel logic among (propositional) fuzzy logics. (shrink)

We show that any coherent complete partial order is obtainable as the fixed-point poset of the strong Kleene jump of a suitably chosen first-order ground model. This is a strengthening of Visser’s result that any finite ccpo is obtainable in this way. The same is true for the van Fraassen supervaluation jump, but not for the weak Kleene jump.

Proceedings of Philosophical Festival Drift 2014. Theme: Under Influence. Includes lectures by Katrien Schaubroeck, Philippe Descola, Markus Gabriel, Ray Brassier, Francesco Berto, Henk Oosterling, and Tomáš Sedlácek (among others). Lectures are in Dutch or English.

This essay offers some thoughts on the editors' (Annette w. Balkema and Henk Slager) project "Exploding Aesthetics" with the goal of extending aesthetics based on a specific type of artistic output. Both artists--Orlan and Morimura--have already expanded the normal parameters of artistic inquiry and the resulting critical discourse. As an aesthetician, I merely offer some elaboration and philosophical backdrop to their creative enterprise. They constitute the paradigm of the avant-garde artist extraordinaire leading us into the uncharted realm of cyberspace (...) and offering us a provocative glimpse of virtual beauty in which artistic insight complements philosophical inquiry. Motivated by their creativity, this essay explores contrasting definitions of real and virtual beauty as well as suggest some reasons why these definitions may prove useful in stimulating discussions about art and the philosophy of art. (shrink)