The perceived strength of darkness enhancement in the centre of surfaces surrounded or not surrounded by illusory contours was investigated as a function of proximity of the constituent elements of the display and their angular size. Magnitude estimation was used to measure the perception of the darkness phenomenon in white-on-grey stimuli. Darkness enhancement was perceived in both types of the stimuli used, but more strongly in the presence of illusory contours. In both cases, perceived darkness enhancement increased with increasing proximity (...) of the constituent parts of the display and with their angular size. These results suggest that the occurrence of darkness (or brightness) enhancement phenomena in the centre of the displays is not directly related to illusory contours, which only reinforce the subjective surface brightness/darkness. (shrink)

Both early and later forms of Buddhism developed a set of arguments to demonstrate that the self is an illusion. This article begins with a brief review of some of the arguments but then proceeds to show that these arguments are not themselves sufficient to dispel the illusion. It analyzes three ways in which the illusion of self manifests itself – as wish fulfillment, as a cognitive illusion, and as a phenomenal illusion. With respect to (...) this last, the article reviews some recent developments in cognitive neuropsychology and neuroscience to discuss the way in which the phenomenal illusion of self is encoded within our brain processes. This article also considers the way in which the illusion of self is constructed through social interaction, by episodic memory, and by narrative construction. Finally, it focuses on how the illusion of self developed as an evolutionary necessity to make it possible for the human organism to navigate physical and social reality; and that it continues to be useful today. This poses a dilemma for the Buddhist soteriological project of extinguishing the illusion of self. Specifically, while it is possible to develop a non-self perspective though the continued practice of vipassanā, it is not possible to maintain it consistently. The article concludes that even fully enlightened individuals must sometimes oscillate between a non-self perspective and a self-perspective and suggests an analogy between this oscillation and what occurs in the Kanizsa square illusion. (shrink)

Emotions often misfire. We sometimes fear innocuous things, such as spiders or mice, and we do so even if we firmly believe that they are innocuous. This is true of all of us, and not only of phobics, who can be considered to suffer from extreme manifestations of a common tendency. We also feel too little or even sometimes no fear at all with respect to very fearsome things, and we do so even if we believe that they are fearsome. (...) Indeed, instead of shunning fearsome things, we might be attracted to them. Emotions that seem more thought-involving, such as shame, guilt or jealousy, can also misfire. You can be ashamed of your big ears even though we can agree that there is nothing shameful in having big ears, and even though you judge that having big ears does not warrant shame. And of course, it is also possible to experience too little or even no shame at all with respect to something that is really shameful. Many of these cases involve a conflict between one’s emotion and one’s evaluative judgement. Emotions that are thus conflicting with judgement can be called ‘recalcitrant emotions’. The question I am interested in is whether or not recalcitrant emotions amount to emotional illusions, that is, whether or not these cases are sufficiently similar to perceptual illusions to justify the claim that they fall under the same general heading. The answer to this depends on what emotions are. For instance, the view that emotions are evaluative judgments makes it difficult to make room for the claim that emotional errors are perceptual illusions. Fearing an innocuous spider would simply amount to making the error of judging that the spider is fearsome while it is in fact innocuous. This might involve an illusion of some sort, but it certainly does not amount to anything like a perceptual illusion. In this chapter, I argue that recalcitrant emotions are a kind of perceptual illusion.. (shrink)

In the present article, the role of Gestalt concepts in clarifying the issues of perception is evaluated. Grounded in anti-atomism, Gestalt assumed organizing forces intrinsic to perception. Insofar these were identified with singularity preference, Gestalt is criticized for having failed to distinguish between perception and thought.

While first-person methods are essential for a science of consciousness, it is controversial what form these methods should take and whether any such methods are reliable. I propose that first-person experiments are a reliable method for investigating conscious experience. I outline the history of these methods and describe their characteristics. In particular, a first-person experiment is an intervention on a subject's experience in which independent variables are manipulated, extraneous variables are held fixed, and in which the subject makes a phenomenal (...) judgement about the target experience of the investigation. I examine historical and contemporary examples of first-person experiments: Mariotte’s demonstration of the visual blind spot, Kanizsa’s subjective contours, the Tse Illusion, and investigations of the non-uniform resolution of the visual field. I discuss the role that phenomenal contrast plays in these methods, and how they overcome typical introspective errors. I argue that their intersubjective repeatability is an important factor in their scientific status, however, it is not the only factor. That they control for extraneous factors and confounds is another factor which sets them apart from pseudoscience (e.g., the perception of auras), and hence another reason for classifying them as genuine experiments. Furthermore, by systematically mapping out the structure of visual experience, these methods make scientific progress. Praises of such first-person experimental approaches may not always be sung by philosophers and psychologists, but they continue to flourish as respectable scientific methods nevertheless. (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)

In this book Daniel Wegner offers a novel understanding of the relation of consciousness, the will, and our intentional and voluntary actions. Wegner claims that our experience and common sense view according to which we can influence our behavior roughly the way we experience that we do it is an illusion.

This book aims to present trompe-l'oeil painting as an ambigous aesthetic ideal offered by early modern theory of art. It embodies the idea of an image identical to what it represents. It is interpreted in terms of perceptual and aesthetic illusion, mimesis, diegesis, play, irony and scientific illustration.

This article presents psychophysical evidence that the Kanizsa Square does not produce an 'object superiority effect' previously reported in similar Gestalt configurations. Implications of the findings for Gestalt theory are addressed.

Modern epistemology has run into several paradoxes in its efforts to explain how knowledge acquisition can be both socially based and still able to determine objective facts about the world. In this important book, Richmond Campbell attempts to dispel some of these paradoxes, to show how they are ultimately just "illusions of paradox," by developing ideas central to two of the most promising currents in epistemology: feminist epistemology and naturalized epistemology. Campbell's aim is to construct a coherent theory of knowing (...) that is feminist and "naturalized." Illusions of Paradox will be valuable for students and scholars of epistemology and women's studies. (shrink)

This edited collection presents the latest cutting-edge research in the philosophy and cognitive science of temporal illusions. Illusion and error have long been important points of entry for both philosophical and psychological approaches to understanding the mind. Temporal illusions, specifically, concern a fundamental feature of lived experience, temporality, and its relation to a fundamental feature of the world, time, thus providing invaluable insight into investigations of the mind and its relationship with the world. The existence of temporal illusions crucially (...) challenges the naïve assumption that we can simply infer the temporal nature of the world from experience. This anthology gathers eighteen original papers from current leading researchers in this subject, covering four broad and interdisciplinary topics: illusions of temporal passage, illusions and duration, illusions of temporal order and simultaneity, and the relationship between temporal illusions and the cognitive representation of time. (shrink)

We present a neuro-geometrical model for generating the shape of Kanizsa's modal subjective contours which is based on the functional architecture of the primary areas of the visual cortex. We focus on V1 and its pinwheel structure and model it as a discrete approximation of a continuous fibration π: R × P → P with base space the space of the retina R and fiber the projective line P of the orientations of the plane. The horizontal cortico-cortical connections of (...) V1 implement what the geometers call the contact structure of the fibration π, and defines therefore an integrability condition which can be shown to correspond to Field's, Hayes', and Hess' psychophysical concept of association field. We present then a variational model of curved modal illusory contours based on the idea that virtual contours are “geodetic” integral curves of the contact structure. (shrink)

One view on the existence of phenomenal overflow is that the subjects' phenomenal consciousness overflowed with their different access consciousness, for they always claimed that they could see all of what was shown but could only report part of it; critics, such as Kouider, interpret this kind of perceptual richness as an illusion. But are the experimental data sufficient to support the illusion explanation? This paper takes the view of Kouider, a representative of the illusion explanation, as (...) a starting point, and by rethinking the relevant experimental data, points out that the illusion explanation is not the best explanation of these data, and therefore does not pose a substantial threat to the existence of phenomenal overflow. (shrink)

What is the relation between Kanizsa's bias towards convexity and the Gestaltists' demonstrations that perceptual organization obeys a principle of pragnänz, or simplicity? Why should either kind of bias exist? Textbook accounts assign no functional role for these biases. Geon theory (Biederman 1987) proposes that we can understand these biases in terms of fundamental processes by which complex objects are decomposed into convex (or singly concave) regions at points of matched cusps according to the transversality regularity (Hoffman and Richards (...) 1985). Such decomposition yields simple, convex parts segmented between the concavities. A shape that contains concavities is generally regarded as complex insofar as it can be decomposed into the regions, or parts, between the concavities. It is these simple parts that are the stable elements of shape, not the whole object. In fact, geon theory leads to the expectation that shape recognition proceeds most efficiently when the parts are good (in the pragnänz sense) but the object is bad! (shrink)

The Illusion of Control makes the case that people waste an inordinate amount of energy trying to control events and people that they have little or no control over.

The Illusion of the Body: Introducing the Body Alive Principle is the divinely inspired work of author David Almeida. This book opens the door to a new understanding in metaphysical thinking. The author draws on the philosophy of panpsychism to support his contention that an unseen ocean of consciousness exists all around us, and within our own bodies (i.e. cells, organs, and systems). The author refers to the Body Alive Principle as “panpsychic healing.” This text offers proven techniques for (...) communicating with the body intelligences the author terms the “little minds.” This process is intended to bring healing to those with both minor and severe medical conditions. Some of the most common medical complaints treated by the Body Alive Principle includes:1. Back or neck pain2. Allergies3. Arthritis/rheumatism4. Difficulty walking5. Headaches6. Lung problems7. Digestive8. Gynecological9. Anxiety disorders10. Heart conditionsThe author contends that even the most nefarious medical issues are curable or can be successfully managed using the Body Alive Principle. This is accomplished through the action of human “super mind”, which will at times consciously supervise the activities of the little minds. The Illusion of the Body instructs its Body Alive practitioners to approach their recovery using several time-tested techniques. Three widely recognized methods are employed in the application of the panpsychic healing philosophy. These modalities are creative visualization and empathetic listening followed by affirmative commands. Each technique is essential to the effectiveness of the Body Alive Principle.This book also discusses guilt and its deleterious effect on the body. True guilt has a beneficial quality when it prevents us from repeating an unacceptable behavior. Beyond this, guilt causes us to become ineffectual. The author holds that this antiquated form guilt needs to be purged, so that we may move on with our lives. A step-by-step process for liberating oneself from the chains of guilt is provided.There is also a section dedicated to trauma because of its potential to immobilize an affected person. Traumatic experiences suddenly unleashed on the body may produce waves of acute anxiety, which wreak havoc on its finely tuned systems. The author recounts his personal experience of negotiating the discharge of negative experiences with the entities supporting them.The Body Alive Principle promotes the importance of adhering to high moral standards in order to maintain homeostasis within ourselves. Integrity is of the outmost importance to the little minds. The author emphasizes the necessity for one to act within the domain of moral excellence. However, the author makes it clear that integrity is a process we work to perfect throughout our lives.The Illusion of the Body represents the author's many years of metaphysical study and experimentation. The author hopes to generate a greater awareness and appreciation of our precious bodily intelligences. The organic vessels that contain our consciousness are alive. They are almost countless in number. If we, the super mind can learn to communicate with the little minds in a positive way, we can ensure ourselves of a more comfortable journey. (shrink)

An examination of the concept of illusion in the writings of Nietzsche, Benjamin, Castoriadis and the Situationists as viewed through the negative dialectics of Theodore Adorno.

Wie frei sind wir? Ist der freie Wille eine Illusion? Mit dem Disput zwischen Philosophie und empirischen Wissenschaften um unsere Freiheit greift dieser Band eine Debatte auf, die in jüngster Zeit nicht nur akademisch mit Vehemenz geführt wurde, sondern auch auf breite öffentliche Resonanz gestoßen ist. Der Autor kritisiert den empirischen Angriff auf unseren freien Willen, stellt aber zugleich die abstrakte philosophische Freiheitsdebatte auf eine solide empirische Basis und deckt so nicht nur die Grenzen, sondern auch die Perspektiven einer (...) empirischen Annäherung an die philosophische Frage Wie frei sind wir? auf. (shrink)

As standardly conceived, an illusion is an experience of an object o appearing F where o is not in fact F. Paradigm examples of color illusion, however, do not fit this pattern. A diagnosis of this uncovers different sense of appearance talk that is the basis of a dilemma for the standard conception. The dilemma is only a challenge. But if the challenge cannot be met, then any conception of experience, such as representationalism, that is committed to the (...) standard conception is false. Perhaps surprisingly, naïve realism provides a better account of color illusion.An apparence ymaad by som Magyk. Chaucer. (shrink)

This chapter contains sections titled: A Permanent Collection? The Phenomenology of Determining a Changing Object in a Moving Subject Visible Freedom: Nineteenth‐Century German Aesthetic Theories and Legacies Transformation A Lasting Impression.

The essay analyses the mereological structure of an act of intentional presentation, on the basis of Benussi' and Kanizsa's works. Several aspects are discussed, among which: The existence of diverse formats of representation, their eventual continuity, the presence of subjective integrations at primary levels, and the identification of phrases in the phenomenic structure of an act of presentation. It is argued that the difference between perceptual and mental presence, as elaborated by Kanizsa, proves to be a valid instrument (...) for the categorial analysis of phenomenic appearances. (shrink)

This chapter contains sections titled: A Temple of Apollo Quoting the Roman Garden Villa Harmonic Proportions The Sculptural Program Expanding the Theme of Harmony Notes.

The Illusion of Doubt confronts one of the most important questions in philosophy and beyond: what can we know? The radical sceptic's answer is 'not very much' if we cannot prove that we are not subject to deception. For centuries philosophers have been impressed by the radical sceptic's move, but this book shows that the radical sceptical problem turns out to be an illusion created by a mistaken picture of our evidential situation. This means that we don't need (...) to answer the radical sceptical problem 'head on', but rather to undermine the philosophical assumptions that it depends on. For without these assumptions, radical scepticism collapses all by itself. This result is highly significant, as it manages to dissolve one of the most intractable philosophical problems that has bedevilled some of the greatest minds until the present day. (shrink)

This commentary on Adam Pautz's excellent book, Perception, explores the consequences of “spatial illusionism,” the view that the spatial properties presented in experience aren't instantiated in the extra-mental world. First, I consider whether spatial illusionism entails that our ordinary beliefs about the physical world are mostly false. I then argue that spatial illusionism threatens to undermine two arguments Pautz's defends in Perception: his argument that sense data theory is incompatible with physicalism, and his central argument against the internal physical state (...) view of perception. (shrink)

Illusionism about phenomenal consciousness is the thesis that phenomenal consciousness does not exist, even though it seems to exist. This thesis is widely judged to be uniquely counterintuitive: the idea that consciousness is an illusion strikes most people as absurd, and seems almost impossible to contemplate in earnest. Defenders of illusionism should be able to explain the apparent absurdity of their own thesis, within their own framework. However, this is no trivial task: arguably, none of the illusionist theories currently (...) on the market is able to do this. I present a new theory of phenomenal introspection and argue that it might deal with the task at hand. (shrink)

It is widely held that when you are deliberating about whether to believe some proposition p, only considerations relevant to the truth of p can be taken into account as reasons bearing on whether to believe p and motivate you accordingly. This thesis of exclusivity has significance for debates about the nature of belief, about control of belief, and about certain forms of evidentialism. In this paper I distinguish a strong and a weak version of exclusivity. I provide reason to (...) think that strong exclusivity is an illusion and that weak exclusivity may also be an illusion. I describe a number of cases in which exclusivity seems not to hold, and I show how an illusion of exclusivity may be generated by a rather different feature of doxastic deliberation, which I call demandingness. (shrink)

"Fascinating and insightful.... I cannot recall a book that has made me think more about the nature of thinking." -- Richard C. Lewontin Harvard University Everyone knows that optical illusions trick us because of the way we see. Now scientists have discovered that cognitive illusions, a set of biases deeply embedded in the human mind, can actually distort the way we think. In Inevitable Illusions, distinguished cognitive researcher Massimo Piattelli-Palmarini takes us on a provocative, challenging, and thoroughly entertaining exploration of (...) the games our minds play. He opens the doors onto the newly charted realm of the cognitive unconscious to reveal the full range of illusions, showing how they inhibit our ability to reason--no matter what our educational background or IQ. Inevitable Illusions is stimulating, eye-opening food for thought. (shrink)

ABSTRACT Understanding is a demanding epistemic state. It involves not just knowledge that things are thus and so, but grasping the reasons why and seeing how things hang together. Understanding, then, typically requires inquiry. Many of our inquiries are conducted online nowadays, with the help of search engines, forums, and social media platforms. In this paper, I explore the idea that online inquiry easily leads to what I will call online illusions of understanding. Both the structure of online information presentation (...) (with hyperlinks, shares, retweets, likes, etc.) and the operation of recommender systems and the like make it easy for people using them to form the impression that they are conducting inquiry responsibly, whereas they are in fact fed with irrelevant information, or, even worse, falsehoods, misinformation, disinformation, or outright conspiracy theories. (shrink)

In "What the Nose Doesn't Know", I argue that there are no olfactory illusions. Central to the traditional notions of illusion and hallucination is a notion of object-failure—the failure of an experience to represent particular objects. Because there are no presented objects in the case of olfactory experience, I argue that the traditional ways of categorizing non-veridical experience do not apply to the olfactory case. In their place, I propose a novel notion of non-veridical experience for the olfactory case. (...) In his (2011), Stevenson responds to my claim that there are no olfactory illusions. Although he agrees that it is natural—or at least commonplace—to think there are no olfactory illusions, he argues that there are and provides examples of them, many of which he suggests have analogues in the visual and auditory domains. In this paper, I examine the nature of the disagreement between us. I argue that Stevenson fails to argue against my conclusion that there are no olfactory illusions. (shrink)

In this chapter I will employ a well-known scientific research heuristic that studies how something works by focusing on circumstances in which it does not work. Rather than trying to describe what scientific understanding would ideally look like, I will try to learn something about it by observing mundane cases where understanding is partly illusory. My main thesis is that scientists are prone to the illusion of depth of understanding (IDU), and as a consequence they sometimes overestimate the detail, (...) coherence, and depth of their understanding. I will analyze the notion of understanding and its relation to a sense of understanding. In order to make plausible the claim that these are often disconnected, I will describe an interesting series of psychological experiments by Frank Keil and his coauthors that suggests that ordinary people routinely overestimate the depth of their understanding. en I will argue that we should take seriously the possibility that scientific cognition is also aðected by IDU and spell out some possible causes of explanatory illusions in science. I will conclude this chapter by discussing how scientific explanatory practices could be improved and how the philosophy of science might be able to contribute to this process. (shrink)

There is a widespread, popular view—and one I basically endorse—that Nietzsche is, in one sense of the word, a nihilist. As Arthur Danto put it some time ago, according to Nietzsche, “there is nothing in [the world] which might sensibly be supposed to have value.” As interpreters of Nietzsche, though, we cannot simply stop here. Nietzsche's higher men, Übermenschen, “genuine philosophers”, free spirits—the types Nietzsche wants to bring forth from the human, all-too-human herds he sees around him with the fish (...) hooks, as he says, of his books—seem to engage in what looks like valuing. These free spirits are supposed to revalue the old values—revaluing, as is clear from the texts, is not simply to remove the old values from circulation (Nietzsche uses “umwerten” and not “entwerten”)—and they are supposed to create new values. And, of course, Nietzsche himself, free spirit that he is, takes on the task of revaluing all values and seems to assert many a strident evaluation. So we need to say more here. What are Nietzsche and his free spirits up to when they engage in what looks, for all the world, like a practice of valuing? What is the practice of valuing Nietzsche is recommending for his free spirits? I argue for two claims: (i) First, we end up facing an interpretive puzzle when we attempt to explain how Nietzsche's free spirits are supposed to engage in a practice of valuing. (ii) Second, we can solve the interpretive puzzle by taking Nietzsche's free spirits to be engaged in a fictionalist simulacrum of valuing. (shrink)

This chapter draws on Schelling's insights about evil to show that the reason we find Ender's Game so disturbing is that it points to unnerving facts about our own lives. One thing that Schelling can help us to notice is that by becoming a selfish monster, Ender passes through an essential phase in his moral development. Card's Ender's Game is disturbing not only because of what its protagonist does and the manipulation that led him to it. It's discomfiting because it (...) points to something all suspect about us: that our freedom is really a product of forces that can't detect or even imagine. Ender's Game is thus revealed as a meditation on the interplay of freedom and fate that defines all of our lives. (shrink)

Meritocracy claims to reward the meritorious with more resources, thereby achieving social efficiency and justice in a level playground. This article argues that the rise of meritocracy in a society is the institutional consequence of adopting progressive humanism, an ideal-type worldview that advocates the harmonious co-realization of individual achievement and social contribution. However, meritocracy is a self-defeating illusion because, even in a level playground, it only rewards conspicuous and wasteful display of ‘merit’ rather than genuine contributions to society. Similar (...) to the promise of an afterlife to Catholicism, the illusion of meritocracy constitutes an indispensable theodicy to progressive humanism. For societies holding such worldviews, meritocracy is a necessary illusion that cannot be dispelled by institutional reforms or political movements. (shrink)

Abstract: There are epistemic manipulators in the world. These people are actively attempting to sacrifice epistemic goods for personal gain. In doing so, manipulators have led many competent epistemic agents into believing contrarian theories that go against well-established knowledge. In this paper, I explore one mechanism by which manipulators get epistemic agents to believe contrarian theories. I do so by looking at a prominent empirical model of trustworthiness. This model identifies three major factors that epistemic agents look for when trying (...) to determine who is trustworthy. These are (i) ability, (ii) benevolence, and (iii) moral integrity. I then show how manipulators can manufacture the illusion that they possess these factors. This leads epistemic agents to view manipulators as trustworthy sources of information. Additionally, I argue that fact-checking will be an ineffective – or even harmful – practice when correcting the beliefs of epistemic agents who have been tricked by this illusion of epistemic trustworthiness. I suggest that in such cases we should use an alternative correction, which I call trust undercutting. (shrink)

de Anima III.10 characterizes akrasia as a conflict between phantasia (“imagination”) on one side and rational cognition on the other: the akratic agent is torn between an appetite for what appears good to her phantasia and a rational desire for what her intellect believes good. This entails that akrasia is parallel to certain cases of perceptual illusion. Drawing on Aristotle's discussion of such cases in the de Anima and de Insomniis , I use this parallel to illuminate the difficult (...) discussion of akrasia in Nicomachean Ethics VII.3, arguing that its account of akrasia as involving ignorance is compatible with, and in fact crucially supplements, the more straightforward account we find elsewhere in the corpus of akrasia as a struggle between desires. (shrink)

t. 1. La vision subjective du monde.--t. 2. Vers une connaissance objective.