Binocular Rivalry

This collection of essays is dedicated to a recently deceased philosopher and humanist, Nalin Ranasinghe. His central philosophical and humanistic preoccupation was with the human soul. Not surprisingly, his greatest inspiration was Socrates' credo "Care for your soul," and the title of his first book was 'The Soul of Socrates'. In this and his later writings, Ranasinghe expressed his growing concern over the idea that the human soul has been highjacked due to the way our civilization has developed: the highest (...) and noblest aspirations of our civilization have been replaced by our obsession with money, pleasure, and power. We now live in a time where we do not know who we are, nor who the people around us are. Despite all of the technical gadgets connecting us virtually, this is the age of disconnect and loneliness, as well as of the degradations of humanity. Ranasinghe insisted that the two keys for recovery are the self-knowledge of the soul and a continuous dialogue with others. We need to relearn how to relate to ourselves and others as unique individuals, not as objects for the satisfaction of our needs. Following his ideas, the twenty essays presented here are divided into two parts: "the soul in reflection" and "the soul in dialogue." The contributors come from various countries around the globe and work in different disciplines, and their chapters aim to revive our interest in the soul and the obscured core of our humanity. This book will appeal to undergraduate and graduate students of philosophy; however, the essays are written in a non-technical language, also making them accessible to the general audience. (shrink)

Jerry Fodor deemed informational encapsulation ‘the essence’ of a system’s modularity and argued that human perceptual processing comprises modular systems, thus construed. Nowadays, his conclusion is widely challenged. Often, this is because experimental work is seen to somehow demonstrate the cognitive penetrability of perceptual processing, where this is assumed to conflict with the informational encapsulation of perceptual systems. Here, I deny the conflict, proposing that cognitive penetration need not have any straightforward bearing on the conjecture that perceptual processing is composed (...) of nothing but informationally encapsulated modules, the conjecture that each and every perceptual computation is performed by an informationally encapsulated module, and the consequences perceptual encapsulation was traditionally expected to have for a perception-cognition border, the epistemology of perception and cognitive science. With these points in view, I propose that particularly plausible cases of cognitive penetration would actually seem to evince the encapsulation of perceptual systems rather than refute/problematize this conjecture. (shrink)

What will your soul's gender be in Heaven? Will your pet Harry be there? Could your clone have a soul? Will eternity be fun? What is it with the ghosts of loved ones? A Natural History of the Soul makes a challenging topic accessible through an entertaining and readable exploration. It begins by reviewing beliefs about the soul and the afterlife in our popular culture, and looks at how they have evolved from the earliest humans. It identifies key concepts in (...) philosophy and major religions, and examines developments in medicine and technology that are shaping our ideas. Throughout the book, provocative questions are raised to help clarify your own beliefs and inform emerging social policy debates. (shrink)

The soul, which dominated many intellectual debates at the beginning of the twentieth century, has virtually disappeared from the sciences and the humanities. Yet it is everywhere in popular culture-from holistic therapies and new spiritual practices to literature and film to ecological and political ideologies. Ignored by scholars, it is hiding in plain sight in a plethora of religious, psychological, environmental, and scientific movements. This book uncovers the history of the concept of the soul in twentieth-century Europe and North America. (...) Beginning in fin de siècle Germany, Kocku von Stuckrad examines a fascination spanning philosophy, the sciences, the arts, and the study of religion, as well as occultism and spiritualism, against the backdrop of the emergence of experimental psychology. He then explores how and why the United States witnessed a flowering of ideas about the soul in popular culture and spirituality in the latter half of the century. Von Stuckrad examines an astonishingly wide range of figures and movements-ranging from Ernest Renan, Martin Buber, and Carl Gustav Jung to the Esalen Institute, deep ecology, and revivals of shamanism, animism, and paganism to Rachel Carson, Ursula K. Le Guin, and the Harry Potter franchise. Revealing how the soul remains central to a culture that is only seemingly secular, this book casts new light on the place of spirituality, religion, and metaphysics in Europe and North America today. (shrink)

The concept of the world soul is difficult to understand in large part because over the course of history it has been invoked to very different ends and within the frameworks of very different philosophical systems, with very different concepts of the world soul emerging as a result. This volume brings together eleven chapters by leading philosophers in their respective fields that collectively explore the various ways in which this concept has been understood and employed, covering the following philosophical areas: (...) Platonism, Stoicism, Medieval, Indian (Vedāntic), Kabbalah, Renaissance, Early Modern, German Romanticism, German Idealism, American Transcendentalism, and contemporary quantum mechanics and panpsychism theories. In addition, short reflections illuminate the impact the concept of the world soul has had on a small selection of areas outside of philosophy: harmony, biology (spontaneous generation), the music of Henry Purcell, psychoanalysis, and Gaia theories. (shrink)

Rooted in the metaphysics of bygone times, the notion of soul in our Western tradition is packed with associations and meanings that are incompatible with the anthropological and naturalistic thinking that prevails in modernity. Whereas treatises of old conceived of the soul as an infinite, immaterial substance which was the ground of man's hope for eternal salvation, modern psychology has for the most part discarded the concept in favor of more tangible touchstones such as the emotions, desires, and attachments which (...) characterize man as a finite, bodily-existing positive fact. An exception to this trend has been the analytical psychology of C. G. Jung. Against the positivistic spirit of his times, Jung insisted upon a "'psychology with soul,' that is, a psychology based upon the hypothesis of an autonomous mind." In this volume, Wolfgang Giegerich once again takes up the Jungian commitment to a psychology with soul. Agreeing with Jung that the soul concept is indispensable for a truly psychological psychology, he supplements and re-orients the Jungian approach to both this concept and the phenomenology of the soul by means of a whole series of nuanced discussions that are as rigorous as they are thoroughgoing. The result is nothing short of a tour de force. Tarrying with the negative, Giegerich's particular contribution resides in his showing the movement against the soul to be the soul's own doing. In animus moments of itself, consciousness in the form of philosophy and Enlightenment reason turned upon itself as religion and metaphysics. Far from abolishing the soul, however, these incisive negations were themselves negated. As if dancing upon its own demise, the soul came home to itself, not as an invisible metaphysical substance, but more invisibly still as the logically negative evaporation of that substance into the form of subject, or even better said, into psychology. (shrink)

Whether the prefrontal cortex is part of the neural substrates of consciousness is currently debated. Against prefrontal theories of consciousness, many have argued that neural activity in the prefrontal cortex does not correlate with consciousness but with subjective reports. We defend prefrontal theories of consciousness against this argument. We surmise that the requirement for reports is not a satisfying explanation of the difference in neural activity between conscious and unconscious trials, and that prefrontal theories of consciousness come out of this (...) debate unscathed. (shrink)

Lazarus Revived shows how two thought experiments provide the foundation for arguments for the existence of conscious life after death. The theories of pluriverses and the Big Bang are examined and a substitute equation for E=MC² is presented.

What makes us human? Richard Swinburne presents new philosophical arguments, supported by modern neuroscience, for the view that we are immaterial souls sustained in existence by our brains.

How should we speak of bodies and souls? In _Coming to Mind_, Lenn E. Goodman and D. Gregory Caramenico pick their way through the minefields of materialist reductionism to present the soul not as the brain’s rival but as its partner. What acts, they argue, is what is real. The soul is not an ethereal wisp but a lively subject, emergent from the body but inadequately described in its terms. Rooted in some of the richest philosophical and intellectual traditions of (...) Western and Eastern philosophy, psychology, literature, and the arts and the latest findings of cognitive psychology and brain science—_Coming to Mind_ is a subtle manifesto of a new humanism and an outstanding contribution to our understanding of the human person. Drawing on new and classical understandings of perception, consciousness, memory, agency, and creativity, Goodman and Caramenico frame a convincing argument for a dynamic and integrated self capable of language, thought, discovery, caring, and love. (shrink)

Olfactory rivalry can occur when a binary mixture is sniffed repeatedly, with one percept dominating then the other. Experiment 1 demonstrated olfactory rivalry using several new techniques. Experiments 2 and 3 examined whether participants can notice rivalry. Participants received trials composed of odor pairs: either a mixture followed by the same mixture; or a pure odor followed by the same pure odor. On some trials participants judged whether the two stimuli were the same or different, to see if they could (...) detect rivalry. On other trials participants judged the quality of each odor, allowing us to determine whether rivalry occurred. We found evidence for rivalry when we compared reports of odor quality for one stimulus and then the other, but no evidence that participants could detect this change. These findings are consistent with the idea that people can experience olfactory illusions, but may not know they have occurred. (shrink)

A great philosopher will change the way you think about your life. For most of human history, religion provided a clear explanation of life and death. But in the late 19th and early 20th centuries new ideas -- from psychiatry to evolution to Communist -- seemed to suggest that our fate was now in our own hands. We would ourselves become God. This is the theme of a remarkable new book by one of the world's greatest lving philosophers. It is (...) a brilliant and frightening look at the problems and opportunities of a world coming to grips with humankind's now solitary, unaided place in the universe. Gray takes two major examples: the belief that the science-backed Communism of the new USSR could reshape the planet, and the belief among a group of Edwardian intellectuals -- popularized through mediums and automatic writing -- that there was a non-religious form of life after death. Gray presents an extraordinary cast of philosophers, journalists, politicians, charlatans and mass murderers, all of whom felt driven by a specifically scientific and modern world view. He raises a host of fascinating questions about what it means to be human. The implications of Gray's book will haunt its readers for the rest of their lives. (shrink)

Contextual regularities, that is, objects’ tendency to appear with certain other objects, facilitate the processing of visual scenes and confer contextually incongruent objects with a special attentional status. This study was aimed at investigating the mechanisms underlying this attentional advantage using Binocular Rivalry . In two experiments, congruent and incongruent images were pitted against each other, yielding a version of BR in which two objects rival within a given scene. Incongruent objects predominated in awareness longer than congruent ones. This effect (...) stemmed from the fact that their dominance epochs lasted longer on the average than those of congruent objects, suggesting a difficulty to disengage attention from such objects. On the other hand, no support was found for the notion that incongruent objects also attract attention. (shrink)

In a recent article on Reid’s theory of single and double vision, James Van Cleve considers an argument against direct realism presented by Hume. Hume argues for the mind-dependent nature of the objects of our perception from the phenomenon of double vision. Reid does not address this particular argument, but Van Cleve considers possible answers Reid might have given to Hume. He finds fault with all these answers. Against Van Cleve, I argue that both appearances in double vision could be (...) considered visible figures of the object, and show how this solution might preserve Reid’s direct realism. However, this solution is not compatible with the single appearance of an object predicted by Reid’s theory of single and double vision. This consequence will appear evident once we consider the critique of Reid’s theory of single and double vision formulated by William Charles Wells (1757-1817). Wells argues that Reid’s theory is either incomplete or incompatible with other claims made by Reid. It is incomplete since it fails to specify the unique direction in which we the object in single vision; if it not incomplete and is compatible with the law of monocular direction given by Reid, then it is incompatible with Reid’s claim that we do not perceive immediately distance by sight. (shrink)

The reality of the soul, its levels and actions, and its relation to the body havealways been among the most important philosophical issues, andevidence for this may be found even in the most ancient philosophicaldeliberations of the Greeks and others.In the philosophical traditions of the Islamic world as well, serious attemptshave been made to present a “science of the soul” which is in accord with thespirit of Islamic philosophical sciences. In the Transcendent Philosophy, onthe other hand, a version of science (...) of the soul has been presented whichboth justifies the concrete sphere of “the immaterial and material soul” anddescribes “the soul’s becoming and seeking for perfection”. In addition, it isfully consistent with the components and overall structure of theTranscendent Philosophy.Based on doctrines of principiality of existence, motion in substance, bodilyorigination and spiritually subsistence of the soul, Mulla Sadra depicts man’ssoul and its station in such a way which is free from usual inconsistencies ofphilosophical traditions in this regard. At the same time, based on the Bookand tradition, he opens a new window to man’s existence through which theexistential dimensions of man are seen in correspondence and as beingsimilar to the whole cosmos. Though, in this way, Mulla Sadra has madeuses of the Peripatetic and Illuminationist traditions of his forerunners, hisown innovations are unrivalled and exceptionally strong. (shrink)

Functionalism, which views consciousness as the product of the processing of stimuli by the brain, is perhaps the dominant view among researchers in the cognitive sciences and associated fields. However, as a workable scientific model of consciousness, it has been marred by a singular lack of tangible success, except at the broadest levels of explanation. This paper argues that this is not an accident, and that in its standard construal it is simply too unwieldy to assume the burden of full-fledged (...) theory. In its place, a reduced functionalism is introduced by applying the principle of parsimony successively to the elements of standard functionalism until only a minimal framework remains. This simpler account states that consciousness is a function of instantaneous causal relations between processing elements rather the putative algorithm such relations are instantiating. It is then argued as a corollary that the only such relations that matter are those in which reciprocal influences are at play. Thus, purely afferent and efferent causal relations are pruned from consideration. The theory resulting from the addition of this corollary is shown to have good correspondence with a number of recent neurophysiologically-motivated approaches to consciousness, including those that stress the importance of reentry, those that view synchrony as a key independent variable, and those that highlight the importance of the accessibility of conscious contents to multiple processing modules. In addition, the theory is shown to be consistent with recent results in the literature on masking, and those in the literature on binocular rivalry. The paper concludes by arguing that the theoretical and empirical difficulties inherent in consciousness research imply that the principle of parsimony must occupy a more central role in consciousness research than it would in ordinary scientific discourse. (shrink)

What do you think your soul looks like? This fully illustrated hardback publication includes hundreds of drawings from all over the world created in response to this question. Soul is the result of seven years of research by curator Robert Blackson and writer Edward Clapp who have asked everybody from goat herders in Tibet to Turner Prize winning artist Jeremy Deller to sit down and draw their soul with just a pencil and paper. The diversity of responses to this elusive (...) question are both poignant and surprising. Each meticulous drawing included in the book is reproduced to its actual size and is accompanied by the name, age and nationality of the artist. Appreciated collectively, Soul is a contemporary portrait of the hopes we have in ourselves. (shrink)

Binocular rivalry provides a useful situation for studying the relation between the temporal flow of conscious experience and the temporal dynamics of neural activity. After proposing a phenomenological framework for understanding temporal aspects of consciousness, we review experimental research on multistable perception and binocular rivalry, singling out various methodological, theoretical, and empirical aspects of this research relevant to studying the flow of experience. We then review an experimental study from our group explicitly concerned with relating the temporal dynamics of rivalrous (...) experience to the temporal dynamics of cortical activity. Drawing attention to the importance of dealing with ongoing activity and its inherent changing nature at both phenomenological and neurodynamical levels, we argue that the notions of recurrence and variability are pertinent to understanding rivalry in particular and the flow of experience in general. (shrink)

This book presents a system of spiritual psychology, integrating astrology and the chakras, including detailed case studies for each chakra.

Might we be parts of a divine mind? Could anything like an afterlife make sense? Starting with a Platonic answer to why the world exists, _Immortality Defended_ suggests we could well be immortal in all of three separate ways. Tackles the fundamental questions posed by our very existence, among them, "why does the cosmos exist?", "is there a divine mind or God?", and "in what sense might we have afterlives?" Defends a belief in immortality, without the need for a religious (...) affiliation or rejection of modern science Explores the ideas of "Einsteinian immortality", the divine afterlife, and the theory of an infinite and divine mind Draws from the work of a wide-range of philosophers, from ancient Greece to the present day, and incorporates up-to-date scientific findings Written in a thought-provoking and engaging manner, accessible to anyone intrigued by the wonder of our being. (shrink)

An important component of souls is the capacity for free will, as the origin of agency within an individual. Belief in souls arises in part from the experience of conscious will, a compelling feeling of personal causation that accompanies almost every action we take, and suggests that an immaterial self is in charge of the physical body.

When our visual system is confronted with ambiguous stimuli, the perceptual interpretation spontaneously alternates between the competing incompatible interpretations. The timing of such perceptual alternations is highly stochastic and the underlying neural mechanisms are poorly understood. Here, we show that perceptual alternations can be triggered by a transient stimulus presented nearby. The induction was tested for four types of bistable stimuli: structure-from-motion, binocular rivalry, Necker cube, and ambiguous apparent motion. While underlying mechanisms may vary among them, a transient flash induced (...) time-locked perceptual alternations in all cases. The effect showed a dependency on the adaptation to the dominant percept prior to the presentation of a flash. These perceptual alternations show many similarities to perceptual disappearances induced by transient stimuli (Kanai & Kamitani, 2003, Moradi & Shimojo, 2004). Mechanisms linking these two transient induced phenomena are discussed. (shrink)

The relationship between brain activity and conscious visual experience is central to our understanding of the neural mechanisms underlying perception. Binocular rivalry, where monocular stimuli compete for perceptual dominance, has been previously used to dissociate the constant stimulus from the varying percept. We report here fMRI results from humans experiencing binocular rivalry under a dichoptic stimulation paradigm that consisted of two drifting random dot patterns with different motion coherence. Each pattern had also a different color, which both enhanced rivalry and (...) was used for reporting which of the two patterns was visible at each time. As the perception of the subjects alternated between coherent motion and motion noise, we examined the effect that these alternations had on the strength of the MR signal throughout the brain. Our results demonstrate that motion perception is able to modulate the activity of several of the visual areas which are known to be involved in motion processing. More specifically, in addition to area V5 which showed the strongest modulation, a higher activity during the perception of motion than during the perception of noise was also clearly observed in areas V3A and LOC, and less so in area V3. In previous studies, these areas had been selectively activated by motion stimuli but whether their activity reflects motion perception or not remained unclear; here we show that they are involved in motion perception as well. The present findings therefore suggest a lack of a clear distinction between ?processing? versus ?perceptual? areas in the brain, but rather that the areas involved in the processing of a specific visual attribute are also part of the neuronal network that is collectively responsible for its perceptual representation. (shrink)

From the evolutionary viewpoint, animals need to monitor the surrounding environment and capture salient features, such as motion, for survival. The visual system is highly developed for monitoring a wide area of visual field and capturing such salient features. In humans and primates, there is a wide binocular field, suggesting a necessity of integrating the images from the two eyes. Binocular rivalry [R. Blake, A neural theory of binocular rivalry, Psychol. Rev. 96 (1989) 145–167; R. Blake, N.K. Logothetis, Visual competition, (...) Nat. Rev. Neurosci. 3 (2002) 13–21], where incompatible inputs from the two eyes compete to emerge in the subject’s visual percept, has been shown to exhibit highly adaptive behavior [I. Kovacs, T.V. Parathomas, M. Yang, A. Feher, When the brain changes its mind: interocular grouping during binocular rivalry. Proc. Natl. Acad. Sci. U.S.A. 93 (1996) 15508–15511; N.K. Logothetis, Single units and conscious vision, Philos. Trans. R. Soc. Lond. B. Biol. Sci. 353 (1998) 1801–1818]. Here we investigated the spatio-temporal dynamics of the ocular dominance pattern in binocular rivalry under conditions where conflicting salient features were presented in a temporally varying manner. We found a striking example of the detailed structure of the dominance wave propagation, by using a spatio-temporal sampling method. The data show in detail the ability of the visual system to dynamically adapt to the changing stimuli in the context of the massively parallel visual field. We show by model prediction that the globally coherent dominance change in the presence of multiple stimuli can be explained by a mechanism based on local saliency comparison. © 2005 Elsevier Ireland Ltd. All rights reserved. (shrink)

Illusions that produce perceptual suppression despite constant retinal input are used to manipulate visual consciousness. Here we report on a powerful variant of existing techniques, Continuous Flash Suppression. Distinct images flashed successively around 10 Hz into one eye reliably suppress an image presented to the other eye. Compared to binocular rivalry, the duration of perceptual suppression increased more than 10-fold. Using this tool we show that the strength of the negative afterimage of an adaptor was reduced by half when it (...) was perceptually suppressed by input from the other eye. The more likely the adaptor was completely suppressed, the larger the reduction of the afterimage intensity. Paradoxically, trial-to-trial visibility of the adaptor did not correlate with the degree of suppression. Our results imply that formation of afterimages involves neuronal structures that access input from both eyes, but that do not correspond directly to the neuronal correlates of perceptual awareness. (shrink)