Antonio Ianni Segatto Dans cet article, je veux montrer quel est le malentendu commun aux lectures opposées des remarques wittgensteiniennes sur « suivre une règle », notamment la lecture sceptique de Kripke et la lecture de Baker et Hacker. Je crois que caractériser correctement le malentendu de ces dernières nous permet de voir la bonne façon de lire ces remarques, dans la mesure où ces lectures sont toujours soumises à une confusion philosophique que Wittgenstein veut dissoudre. Ensuite, (...) je présente un commentaire des §§239-242 des Recherches philosophiques inspiré de la lecture dite résolue, en attirant l’attention sur un des aspects souvent négligés par les commentateurs, en particulier la dimension temporelle du langage. L’examen de la relation entre celle-ci et l’activité de suivre des règles entend présenter de nouveaux arguments en faveur d’une lecture résolue. (shrink)

Pretende-se é elucidar alguns aspectos da teoria pragmática da linguagem de Habermas tal como apresentada no primeiro capítulo de Facticidade e validade relacionando as teses apresentadas nessa parte do livro a teses apresentadas sobretudo na segunda parte de Pensamento pós-metafísico a fim de elucidar com como a teoria discursiva do direito e da democracia apresentada em 1992 tem seu ponto de apoio em uma concepção específica da linguagem. Essa estratégia permite examinar os pressupostos normalmente deixados à sombra nas discussões da (...) teoria do direito e da democracia de Habermas, assim como permite responder a algumas objeções dirigidas a essa teoria. (shrink)

Based on the distinction drawn by James Conant between Cartesian skepticism and Kantian skepticism, I intend to show that Wittgenstein’s remarks on dreaming should not be understood as a direct attack on the former, as commonly held, but as an indirect attack on it, for Wittgenstein approaches Descartes’ dreaming hypothesis by changing the very problematic at stake. Wittgenstein’s attack on skepticism takes one step back from a question about how to distinguish between dreaming that one is experiencing something and actually (...) experiencing it, for this attack focuses on the linguistic conditions of the possibility of something that the Cartesian problematic takes for granted, that is, the very possibility of saying “I am dreaming.” I also intend to show that Wittgenstein’s remarks on dreaming should be read in light of his claim that skepticism is nonsensical put forward in the Tractatus logico-philosophicus as well in his last writings. More specifically, I intend to show that the words “I am dreaming” are nonsensical in the same sense as the alleged proposition “There are physical objects” and the expression of doubt about the existence of physical objects or the external world. (shrink)

In this paper I aim to elucidate Wittgenstein’s claim that the so-called dream argument is senseless. Unlike other interpreters, who understand the sentence “I am dreaming” as contradictory or self-defeating, I intend to elucidate in what sense one should understand it as senseless or, more precisely, as nonsensical. In this sense, I propose to understand the above-mentioned claim in light of Wittgenstein’s criticism of skepticism from the _Tractatus logico-philosophicus_ to his last writings. I intend to show that the words “I (...) am dreaming” are nonsensical in the same sense as the alleged proposition “There are physical objects” or the expression of doubt about the existence of external objects. (shrink)

Neste artigo pretende-se discutir a dimensão política presente na origem da teoria do reconhecimento de Axel Honneth, partindo da constatação de que durante a reelaboração de sua tese de habilitação, publicada em 1992 com o título de Luta por reconhecimento, o autor se posiciona pela primeira vez diante do debate entre liberais e comunitaristas e elabora seu conceito formal de eticidade como uma resposta às limitações de cada uma dessas correntes da teoria política contemporânea.

Harmonia, m etodo e filosofia -- Intencionalidade -- Regras e acordos.

ABSTRACT This article surveys recent work on oracular prophecies and their role in Greek perceptions of Russia in the early modern period. Drawing on this survey, the article provides a critical assessment of the historiographical paradigm of the ‘Russian Expectation’ offered by Paschalis Kitromilides for the analysis of Greek-Russian relations. Finally, the article proposes that scholars should focus on the concept of protection as an aspect of political language, this providing an explanation for particular Greek and also Russian interpretations of (...) the Treaty of Kuçuk-Kaynardja of 1774. (shrink)

Este artigo tem como intenção investigar as maneiras segundo as quais as inter- relações didático-pedagógicas nas "comunidades de investigação filosófica", possam ser lidas a partir de uma ótica que enfatize os processos de (auto)construção subjetiva constantemente realizados por seus/suas participantes. Utilizando a noção de ―relação de vontade a vontade‖ articulada por Jacques Rancière, procurarei desenvolver algumas possíveis interpretações das interações entre pensamento e afetos, em especial, sua condição latente de ocupar posição privilegiada nas dinâmicas de auto-percepção e hetero-reconhecimento intelectuais. A (...) intenção é tentar mostrar como as dinâmicas são realizadas verbal e/ou corporalmente, segundo enunciações avaliativas da participação e contribuição em classe, feitas tanto por colegas como por mediadores/as. (shrink)

Pendragon Press is proud to offer this new, revised, and expanded edition of Formalized Music, Iannis Xenakis's landmark book of 1971. In addition to three totally new chapters examining recent breakthroughs in music theory, two original computer programs illustrating the actual realization of newly proposed methods of composition, and an appendix of the very latest developments of stochastic synthesis as an invitation to future exploration, Xenakis offers a very critical self-examination of his theoretical propositions and artistic output of the past (...) thirty-five years. This edition of Formalized Music is an essential tool for understanding the man and the thought processes of one of this century's most important and revolutionary musical figures. (shrink)

PRELIMINAR Y STA TEMENT BY IA NNIS XENA KIS Subtended Philosophy* The worlds of classical, contemporary, pop, folk, traditional, avant-garde, etc., ...

Columbia University Press's multivolume _Prison Notebooks_ is the only complete critical edition of Antonio Gramsci's seminal writings in English. Based on the authoritative Italian edition of Gramsci's work, _Quaderni del Carcere_, this comprehensive translation presents the intellectual as he ought to be read and understood, with critical notes that clarify Gramsci's history, culture, and sources; an index of names; and a contextualization of the thinker's ideas against his earlier writings and letters. This set includes notebooks 1 through 8 with (...) all attendant notes and materials and is an indispensible resource for scholars in the humanities and social sciences. (shrink)

We propose a nonmonotonic Description Logic of typicality able to account for the phenomenon of combining prototypical concepts, an open problem in the fields of AI and cognitive modelling. Our logic extends the logic of typicality ALC + TR, based on the notion of rational closure, by inclusions p :: T(C) v D (“we have probability p that typical Cs are Ds”), coming from the distributed semantics of probabilistic Description Logics. Additionally, it embeds a set of cognitive heuristics for concept (...) combination. We show that the complexity of reasoning in our logic is EXPTIME-complete as in ALC. (shrink)

The paper introduces an extension of the proposal according to which conceptual representations in cognitive agents should be intended as heterogeneous proxytypes. The main contribution of this paper is in that it details how to reconcile, under a heterogeneous representational perspective, different theories of typicality about conceptual representation and reasoning. In particular, it provides a novel theoretical hypothesis - as well as a novel categorization algorithm called DELTA - showing how to integrate the representational and reasoning assumptions of the theory-theory (...) of concepts with the those ascribed to the prototype and exemplars-based theories. (shrink)

The publication of this book is an event in the making. All over the world scientists, psychologists, and philosophers are waiting to read Antonio Damasio's new theory of the nature of consciousness and the construction of the self. A renowned and revered scientist and clinician, Damasio has spent decades following amnesiacs down hospital corridors, waiting for comatose patients to awaken, and devising ingenious research using PET scans to piece together the great puzzle of consciousness. In his bestselling Descartes' Error, (...) Damasio revealed the critical importance of emotion in the making of reason. Building on this foundation, he now shows how consciousness is created. Consciousness is the feeling of what happens-our mind noticing the body's reaction to the world and responding to that experience. Without our bodies there can be no consciousness, which is at heart a mechanism for survival that engages body, emotion, and mind in the glorious spiral of human life. A hymn to the possibilities of human existence, a magnificent work of ingenious science, a gorgeously written book, The Feeling of What Happens is already being hailed as a classic. (shrink)

Este artigo visa analisar de que modo as questões pertinentes à situação do Paraguai do Pós-Guerra da Tríplice Aliança serviram de instrumento de luta político-partidária entre nacionalistas e autonomistas durante a campanha presidencial argentina de 1873 e 1874. Para isso, foram consultados alguns jornais de Buenos Aires, uma vez que eram os principais canalizadores dos debates públicos e difusores de representações. Da análise das fontes pode-se apontar que a facção autonomista fez daquele conflito, da ocupação do Paraguai e das questões (...) pendentes daquele evento uma das suas principais armas de combate em sua luta eleitoral contra o nacionalismo. (shrink)

Hanno ancora qualcosa da dirci Sartre e Merleau-Ponty oggi? Sessant’anni dopo i loro “contraccolpi” – consumatisi nella redazione di una rivista come “Les Temps Modernes” – vale ancora la pena di ripercorrere quella storia? È questa la domanda che apre l’ultimo numero di “aut aut” curato da Enrica Lisciani-Petrini e Raoul Kirchmayr. Si tratta di una domanda a cui è difficile rispondere e che ha a che fare con che cos’è la filosofia e – soprattutto – che cos’è un filosofo. (...) È una domanda che, nel caso di Sartre e di Merleau-Ponty, non chiama in causa soltanto due differenti scuole di pensiero, ma anche due modi differenti di intendere il mondo, la politica, gli altri e le relazioni con essi. Ma si tratta, in fondo, di una domanda che – con le parole di Sartre – ci porta a riflettere sul fatto che “si è filosofi quando si è morti”, poiché – in fondo – “fino a quando viviamo, siamo uomini che, tra l’altro, scrivono opere di filosofia”. E allora la risposta a quella domanda non può che essere affermativa: il loro “dissidio produttivo” è un atto vitale, un incontro-scontro necessario fra persone che fanno vivere la filosofia.Sartre et Merleau-Ponty ont-ils encore quelque chose à nous dire aujourd’hui? Soixante années après leurs « contrecoups » – qui ont eu lieu dans la rédaction de la revue Les Temps Modernes – vaut-il encore la peine de reparcourir cette histoire? Voilà la question qui ouvre le dernier numéro de la revue « aut aut », sous la direction d’Enrica Lisciani-Petrini et Raoul Kirchmayr. Il s’agit d’une question à laquelle il est difficile de répondre et qui est en rapport avec ce qu’est la philosophie et – surtout – avec ce qu’est un philosophe. Il s’agit d’une question qui, chez Sartre et Merleau-Ponty, ne met pas seulement en cause deux courants de pensée différents, mais aussi deux différentes manières de concevoir le monde, la politique, les autres et les relations qu’on entretient avec eux. Mais il s’agit, au fond, d’une question qui – en employant les mots de Sartre – nous conduit à réfléchir sur le fait que « l’on est philosophes quand on est morts », parce que – après tout – « jusqu’à ce que nous vivons, nous sommes des hommes qui, entre autre, écrivent des oeuvres de philosophie ». Alors la réponse à cette question ne peut être qu’affirmative : leur « différend productif » est un acte vital, en même temps une rencontre et un affrontement nécessaires entre des personnes qui font vivre la philosophie.Do Sartre and Merleau-Ponty still have something to say to us today? Sixty years after their “breakup” – which took place in editing the journal Les Temps Modernes – is it still worthwhile to go over this history? This is the question that opens the last issue of the journal “aut aut,” under the direction of Enrica Lisciani-Petrini and Raoul Kirchmayr. It is a question to which it is difficult to respond and bears on what philosophy is – and especially with what a philosopher is today. It is a matter which, according to Sartre and Merleau-Ponty, does not only call into question two different currents of thought, but also two different ways of conceiving the world, politics, others and the relations between them. But it is a matter, at its core, which – employing the words of Sartre – leads us to reflect on the fact that “we are philosophers when we are dead,” because – after all – “while we are alive, we are men who, among other things, write works of philosophy.” Thus, the response to this question can only be affirmative: their “productive difference” is a vital act, at the same time an encounter and necessary confrontation between persons who breathe life into philosophy. (shrink)

The main object of this project is how it can become possible to sense an invisible element such as the air. An installation will be created that will aim to provide a sensorial way of dealing with the air and the wind – that is air in motion – with the help of a computer-assisted environment. The objective is to engage the spectator in the navigation of semantic and sensual space that has its own quasi-mythical structure. The attention is focused (...) on the cognition dimension of the human body and senses and the enlargement of perception through the application of new technologies. The wind is a highly abstract phenomenon, with many physical and metaphysical aspects and is one of the basic elements of the physical universe. At the same time, the wind has an enormous impact on our lives, which we perceive, visually and acoustically only through its effects. That is why it has provided material for mythology and art throughout the centuries. In this project, the intention is to create a place where the visitor will be immersed into the landscapes of the winds of the world in order to increase his awareness and knowledge about them by merging technology, myth and body. The research is going to deal with both physical and metaphysical/mythological dimensions of the phenomenon. This starts with an investigation of references to winds and wind phenomena in mythologies world-wide, and extends over the scientific or causal explanations of the wind, as well as the investigation of its auditory and visual manifestations. Data from the Internet will be converted to audio and visual forms in a physical space, in real time. The online data that will be fed into the system are the intensity and direction of the winds at specific default locations on the planet. The visitor’s movements and his/her path in this given area will affect these audio-visual forms. The deliverables of the project (still in its definition phase) are:A study including the research methodology and the outcomes from the researchAn audio-visual interactive installation based on web data. (shrink)

Antonio Negri, one of the world's leading scholars on Baruch Spinoza (1632-1677) and his contemporary legacy, offers a straightforward explanation of the philosopher's elaborate arguments and a persuasive case for his ongoing relevance. Responding to a resurgent interest in Spinoza's thought and its potential application to contemporary global issues, Negri demonstrates the thinker's special value to politics, philosophy, and related disciplines. Negri's work is both a return to and an advancement of his initial affirmation of Spinozian thought in _The (...) Savage Anomaly_. He further defends his understanding of the philosopher as a proto-postmodernist, or a thinker who is just now, with the advent of the postmodern, becoming contemporary. Negri also connects Spinoza's theories to recent trends in political philosophy, particularly the reengagement with Carl Schmitt's "political theology," and the history of philosophy, including the argument that Spinoza belongs to a "radical enlightenment." By positioning Spinoza as a contemporary revolutionary intellectual, Negri addresses and effectively defeats twentieth-century critiques of the thinker waged by Jacques Derrida, Alain Badiou, and Giorgio Agamben. (shrink)

This article addresses an open problem in the area of cognitive systems and architectures: namely the problem of handling (in terms of processing and reasoning capabilities) complex knowledge structures that can be at least plausibly comparable, both in terms of size and of typology of the encoded information, to the knowledge that humans process daily for executing everyday activities. Handling a huge amount of knowledge, and selectively retrieve it according to the needs emerging in different situational scenarios, is an important (...) aspect of human intelligence. For this task, in fact, humans adopt a wide range of heuristics (Gigerenzer & Todd) due to their “bounded rationality” (Simon, 1957). In this perspective, one of the requirements that should be considered for the design, the realization and the evaluation of intelligent cognitively-inspired systems should be rep- resented by their ability of heuristically identify and retrieve, from the general knowledge stored in their artificial Long Term Memory (LTM), that one which is synthetically and contextually relevant. This requirement, however, is often neglected. Currently, artificial cognitive systems and architectures are not able, de facto, to deal with complex knowledge structures that can be even slightly comparable to the knowledge heuris- tically managed by humans. In this paper I will argue that this is not only a technological problem but also an epistemological one and I will briefly sketch a proposal for a possible solution. (shrink)

Endowing artificial systems with explanatory capacities about the reasons guiding their decisions, represents a crucial challenge and research objective in the current fields of Artificial Intelligence (AI) and Computational Cognitive Science [Langley et al., 2017]. Current mainstream AI systems, in fact, despite the enormous progresses reached in specific tasks, mostly fail to provide a transparent account of the reasons determining their behavior (both in cases of a successful or unsuccessful output). This is due to the fact that the classical problem (...) of opacity in artificial neural networks (ANNs) explodes with the adoption of current Deep Learning techniques [LeCun, Bengio, Hinton, 2015]. In this paper we argue that the explanatory deficit of such techniques represents an important problem, that limits their adoption in the cognitive modelling and computational cognitive science arena. In particular we will show how the current attempts of providing explanations of the deep nets behaviour (see e.g. [Ritter et al. 2017] are not satisfactory. As a possibile way out to this problem, we present two different research strategies. The first strategy aims at dealing with the opacity problem by providing a more abstract interpretation of neural mechanisms and representations. This approach is adopted, for example, by the biologically inspired SPAUN architecture [Eliasmith et al., 2012] and by other proposals suggesting, for example, the interpretation of neural networks in terms of the Conceptual Spaces framework [Gärdenfors 2000, Lieto, Chella and Frixione, 2017]. All such proposals presuppose that the neural level of representation can be considered somehow irrelevant for attacking the problem of explanation [Lieto, Lebiere and Oltramari, 2017]. In our opinion, pursuing this research direction can still preserve the use of deep learning techniques in artificial cognitive models provided that novel and additional results in terms of “transparency” are obtained. The second strategy is somehow at odds with respect to the previous one and tries to address the explanatory issue by avoiding to directly solve the “opacity” problem. In this case, the idea is that one of resorting to pre-compiled plausible explanatory models of the word used in combination with deep-nets (see e.g. [Augello et al. 2017]). We argue that this research agenda, even if does not directly fits the explanatory needs of Computational Cognitive Science, can still be useful to provide results in the area of applied AI aiming at shedding light on the models of interaction between low level and high level tasks (e.g. between perceptual categorization and explanantion) in artificial systems. (shrink)

Combining typical knowledge to generate novel concepts is an important creative trait of human cognition. Dealing with such ability requires, from an AI perspective, the harmonization of two conflicting requirements that are hardly accommodated in symbolic systems: the need of a syntactic compositionality (typical of logical systems) and that one concerning the exhibition of typicality effects (see Frixione and Lieto, 2012). In this work we provide a logical framework able to account for this type of human-like concept combination. We propose (...) a nonmonotonic Description Logic of typicality called TCL (Typicality-based Compositional Logic). (shrink)

Persuasive technologies can adopt several strategies to change the attitudes and behaviors of their users. In this work I synthesize the lessons learned from three empirical case studies on automated persuasion that have been carried out in the last decade in the contexts of: persuasive news recommendations, social robotics, and e-commerce, respectively. In particular, such studies have assessed, in the technological domain, the effects of nudging techniques relying on well known persuasive argumentation schemas and on framing strategies. In discussing the (...) main findings, I will argue that the obtained persuasive effects are due to the fact that such techniques leverage on cognitive mechanisms that refer to the “system 1” types of automatic processes hypothesized in the context of the dual process theory of reasoning. As a consequence of this state of affairs, any automated persuasive systems (used for ethical purposes: e.g. suggesting good health habits) should be able to re-use these types of system 1 strategies in order to gradually take the users in an argumentation territory where system 2 processes can take place. -/- . (shrink)

What kind of relationship subsists between an "organism" and a "monas dominans"? In some texts, Leibniz claims that the soul "actuat" the organic body and in the late debate with Stahl he describes the "monas dominans" as a "monas actuatrix". But how does the monas "actualize" the organic body? And what is implied by Leibniz's use of the word "agere" to describe this? Is it also possibile to describe this event in terms of "whole/part" relationship? The aim of this paper (...) is to sketch out the status quaestionis of the topic by discussing some of the most recent studies. More specifically to propose an interpretation of the "monas dominans" as the "nota distinguens" of the whole organism. (shrink)

The theory of the social responsibility of the firm oscillates between two extremes: one that reduces the firm's responsibility to the obtainment of (the greatest possible) profit for its shareholders, and another that extends the firm's responsibility to include a wide range of actors with an interest or "stake" in the firm. The stakeholder theory of the social responsibility of business is more appealing from an ethical point of view, and yet it lacks a solid foundation that would be acceptable (...) to a variety of schools of thought.In this paper I argue that the stakeholder theory could be founded on the concept of the common good. First, I explain the foundations of the theory of the common good, the concept itself, how it relates to the individual good, and its role in the firm. Following that, I explain how the theory of the common good could be applied to the stakeholder theory. Finally, I draw some conclusions. (shrink)

Antonio Gramsci (1891--1937) was one of the most original political thinkers in Western Marxism and an exceptional intellectual. Arrested and imprisoned by the Italian Fascist regime in 1926, Gramsci died before fully regaining his freedom, yet he wrote extensive letters while incarcerated, rich with insight into the physical and psychological tortures of prison. In meticulous detail, Gramsci records how political prisoners, himself included, contend with the fear of illness and death and the rules and regulations that threaten to efface (...) their individuality. Forming an incomparable link between Gramsci's intellectual passion and his emotional vulnerability, _Letters from Prison_ shows a man reconstructing his life while being separated from it, struggling to recapture the primary relationships that once defined his identity. Frank Rosengarten divides more than four hundred Gramsci letters into two companion volumes, complete with a chronology of the thinker's crucial life experiences, biographical notes on his correspondents, and a bibliography of works cited in his letters. (shrink)

_Factory of Strategy_ is the last of Antonio Negri's major political works to be translated into English. Rigorous and accessible, it is both a systematic inquiry into the development of Lenin's thought and an encapsulation of a critical shift in Negri's theoretical trajectory. Lenin is the only prominent politician of the modern era to seriously question the "withering away" and "extinction" of the state, and like Marx, he recognized the link between capitalism and modern sovereignty and the need to (...) destroy capitalism and reconfigure the state. Negri refrains from portraying Lenin as a ferocious dictator enforcing the proletariat's reappropriation of wealth, nor does he depict him as a mere military tool of a vanguard opposed to the Ancien Régime. Negri instead champions Leninism's ability to adapt to different working-class configurations in Russia, China, Latin America, and elsewhere. He argues that Lenin developed a new political figuration in and beyond modernity and an effective organization capable of absorbing different historical conditions. He ultimately urges readers to recognize the universal application of Leninism today and its potential to institutionally--not anarchically--dismantle centralized power. (shrink)

Controversies around large-scale development projects offer many cases and insights which may be analyzed through the lenses of corporate social (_ir_)responsibility (CS_I_R) and business ethics studies. In this paper, we confront the CSR narratives and strategies of _WeBuild_ (formerly known as _Salini Impregilo_), an Italian transnational construction company. Starting from the Global Atlas of Environmental Justice (EJAtlas), we collect evidence from NGOs, environmental justice organizations, journalists, scholars, and community leaders on socio-environmental injustices and controversies surrounding 38 large hydropower schemes built (...) by the corporation throughout the last century. As a counter-reporting exercise, we code (un)sustainability discourses from a plurality of sources, looking at their discrepancy under the critical lenses of post-normal science and political ecology, with environmental justice as a normative framework. Our results show how the mismatch of narratives can be interpreted by considering the voluntary, self-reporting, non-binding nature of CSR accounting performed by a corporation wishing to grow in a global competitive market. Contributing to critical perspectives on political CS(I)R, we question the reliability of current CSR mechanisms and instruments, calling for the inclusion of complexity dimensions in and a re-politicization of CS(I)R accounting and ethics. We argue that the fields of post-normal science and political ecology can contribute to these goals. (shrink)

Although virtues have gained a firm presence in the theory and practice of corporate management, humility is not ranked as one the chief virtues in the business world. In spite of this, it is an important virtue, contributing to the manager’s moral and professional quality and the development of the company’s human team. This paper explains the basic traits of humility in general and how they manifest in the manager’s life and profession, and shows, within the ethics of virtues, that (...) it is not just a personal desideratum but a fundamental quality of a good manager and good management. (shrink)

In this work we present NERVOUS, an intelligent recommender system exploiting a probabilistic extension of a Description Logic of typicality to dynamically generate novel contents in AllMusic, a comprehensive and in-depth resource about music, providing data about albums, bands, musicians and songs. The tool can be used for both the generation of novel music genres and styles, described by a set of typical properties characterizing them, and the reclassification of the available songs within such new genres.

Inventing novel knowledge to solve problems is a crucial, creative, mechanism employed by humans, to extend their range of action. In this paper, we present TCL (typicality-based compositional logic): a probabilistic, non monotonic extension of standard Description Logics of typicality, and will show how this framework is able to endow artificial systems of a human-like, commonsense based, concept composition procedure that allows its employment in a number of applications (ranging from computational creativity to goal-based reasoning to recommender systems and affective (...) computing). -/- The framework relies on 3 main ingredients: a non monotonic extension of standard Description Logics (allowing to reason on exceptions to inheritance in standard knowledge bases) a probabilistic extension coming from the field of logic programming (the DISPONTE semantics) a cognitive heuristics known ad HEAD-Modifier determining preference rules for the inheritance mechanisms of the novel concepts to be generated via commonsense rules. -/- We report the obtained results and the lessons learned of this research path in the context of model-based AI applications. -/- . (shrink)

Background Neuroimaging and lesion studies suggested that the dorsolateral prefrontal and posterior parietal cortices mediate visual metacognitive awareness. The causal evidence provided by non-invasive brain stimulation, however, is inconsistent. -/- Objective/hypothesis Here we revisit a major figure discrimination experiment adding a new Kanizsa figure task trying to resolve whether bilateral continuous theta-burst transcranial magnetic stimulation (cTBS) over these regions affects perceptual metacognition. Specifically, we tested whether subjective visibility ratings and/or metacognitive efficiency are lower when cTBS is applied to these two (...) regions in comparison to an active control region. -/- Methods A within-subjects design including three sessions spaced by one-week intervals was implemented. In each session, every participant was administered bilateral cTBS to either prefrontal, control or parietal cortices. Two concurrent tasks were performed, a real and an illusory figure task, stabilising objective performance with use of an adaptive staircase procedure. -/- Results When performing the replicated task, cTBS was found insufficient to disrupt neither visibility ratings nor metacognitive efficiency. However, with use of Kanizsa style illusory figures, cTBS over the dorsolateral prefrontal, but not over the posterior parietal cortex, was observed to significantly diminish metacognitive efficiency. -/- Conclusion(s) Real and illusory figure tasks demonstrated different cTBS effects. A possible explanation is the involvement of the prefrontal cortex in the creation of expectations, which is necessary for efficient metacognition. Failure to replicate previous findings for the real figure task, however, cannot be said to support, conclusively, the notion that these brain regions have a causal role in metacognitive awareness. This inconsistent finding may result from certain limitations of our study, thereby suggesting the need for yet further investigation. (shrink)