The dynamic developmental theory of attention-deficit/hyperactivity disorder (ADHD) proposes that hypodopaminergic functioning results in anomalous delay-of-reinforcement gradients in ADHD, which in turn might account for many of the observed behavioral and cognitive characteristics. However, hyperdopaminergic functioning might also impair mnemonic representation of codes for spatial, motoric, and reward information and contribute to the purported shorter delay gradients in ADHD.

Notwithstanding the many strengths of the dynamic developmental theory, there remain challenges to be overcome before it can be incorporated into a true causal model of attention-deficit/hyperactivity disorder (ADHD). These include the development of reliable measures of reinforcement delay gradients, the validation of shortened reinforcement delay as an endophenotype, and the integration of this pathway with other potential pathways.

Sagvolden, Johansen, Aase, and Russell (Sagvolden et al.) examine attention-deficit/hyperactivity disorder (ADHD) at levels of analysis ranging from neurotransmitters to behavior. At the behavioral level they attribute aspects of ADHD to anomalies of delay-of-reinforcement gradients. With a normal gradient, responses followed after a long delay by a reinforcer may share in the effects of that reinforcer; with a diminished or steepened gradient they may fail to do so. Steepened gradients differentially select rapidly emitted responses (hyperactivity), and (...) they limit the effectiveness with which extended stimuli become conditioned reinforcers, so that observing behavior is less well maintained (attention deficit). Impulsiveness also follows from steepened gradients, which increase the effectiveness of smaller, more immediate consequences relative to larger, more delayed ones. Individuals who vary in the degree to which their delay gradients are steepened will show different balances between hyperactivity and attention deficit. Given the range of ADHD phenomena addressed, it may be unnecessary to appeal to additional behavioral processes such as extinction deficit. Extinction deficit is more likely a derivative of attention deficit, in that failure to attend to stimuli differentially correlated with extinction should slow its progress. The account suggests how relatively small differences in delay gradients early in development might engender behavioral interactions leading to very large differences later on. The steepened gradients presumably originate in properties of neurotransmitter function, but behavioral interventions that use consistently short delays of reinforcement to build higher-order behavioral units as a scaffolding to support complex cognitive and social skills may nonetheless be feasible. Key Words: ADHD; attention deficit; delay gradient; exponential decay; extinction deficit; hyperactivity; impulsiveness; intervention; observing responses; self-control. Footnotes1000 Jeffrey Gray was the BBS Editor for this treatment. When he accepted Sagvolden et al. for publication, he invited Catania, who was one of the reviewers of the original submission, to prepare a precommentary. Com-mentators were then invited to respond to the Sagvolden et al. article, to the Catania precommentary, or to both. (shrink)

In this study, two modified gradient descent algorithms are proposed for time-delayed models. To estimate the parameters and time-delay simultaneously, a redundant rule method is introduced, which turns the time-delayed model into an augmented model. Then, two GD algorithms can be used to identify the time-delayed model. Compared with the traditional GD algorithms, these two modified GD algorithms have the following advantages: avoid a high-order matrix eigenvalue calculation, thus, are more efficient for large-scale systems; have faster convergence rates, (...) therefore, are more practical in engineering practices. The convergence properties and simulation examples are presented to illustrate the efficiency of the two algorithms. (shrink)

A model predictive control method based on recursive backpropagation neural network and genetic algorithm is proposed for a class of nonlinear systems with time delays and uncertainties. In the offline modeling stage, a multistep-ahead predictor with GA-RBP neural network is designed, where GA-BP neural network is used as a one-step prediction model and GA is employed to train the initial weights and bias of the BP neural network. The incorporation of GA into RBP can reduce the possibility of the BP (...) neural network falling into a local optimum instead of reaching global optimization. In the online optimizing stage, a multistep-ahead GA-RBP neural network predictor and an improved gradient descent method are proposed to efficiently solve the online optimization problem of nonlinear MPC by minimizing a modified quadratic criterion. The designed MPC strategy can avoid information loss while linearizing the controlled system and computing the Hessian matrix and its inverse matrix. Experimental results show that the proposed approach can reduce the computational burden and improve the performance of MPC for the solution of nonlinear controlled systems. (shrink)

In this paper, we study the problem of protecting privacy in recommender systems. We focus on protecting the items rated by users and propose a novel privacy-preserving matrix factorization algorithm. In our algorithm, the user will submit a fake gradient to make the central server not able to distinguish which items are selected by the user. We make the Kullback–Leibler distance between the real and fake gradient distributions to be small thus hard to be distinguished. Using theories and (...) experiments, we show that our algorithm can be reduced to a time-delay SGD, which can be proved to have a good convergence so that the accuracy will not decline. Our algorithm achieves a good tradeoff between the privacy and accuracy. (shrink)

Thirty years after the publication of Dominique Janicaud’s criticism of what he termed the “theological turn” of phenomenology in France, what is the state of the debate? This paper addresses that question, by examining the phenomenology of revelation in Marion, Lacoste, and others, in turn replying to various arguments that have been advanced against the theological turn and on behalf of methodological atheism. Not only is revelation a viable topic of phenomenological analysis, the attempts to formulate a methodologically atheist phenomenology (...) fail. (shrink)

In this original work, Steven DeLay, using a wide breadth of philosophical sources, articulates a view of selfhood which emphasizes humanity’s ineluctable experience before-God.

Traditionally, phenomenology has understood the self in light of intentionality and hence the world. However, contemporary French phenomenology—as represented here by Jean-Luc Marion—contends that this view of subjectivity is open to challenge: our mode of existence is not simply one of “being-in the-world.” I develop this claim by examining Marion’s reformulation of the reduction. Here, the phenomenon of vanity is key. I first present Husserl’s and Heidegger’s own formulations of the reduction. Following Marion, I show that the blow of vanity (...) neutralizes both, by undercutting the respective questions to which they respond. For, in response to vanity’s own question—“What’s the use?”—neither the transcendental nor ontological reductions have a reply. Vanity consequently renders the Heideggerian distinction between authenticity and inauthenticity existentially moot. To establish this, I evaluate how existing interpretations of authenticity overlook the phenomenon of vanity. Phenomenology, I urge in conclusion, should shift its attention to the horizons opened by Marion’s erotic reduction. (shrink)

What and how is the work of art? This paper considers Heidegger’s venerable question by way of a related one: what exactly is the essence of the painting? En route to critiquing the Heideggerian conception of the work of art as that which discloses a world, I present Michel Henry’s competing aesthetic theory. According to Henry, the artwork’s task is not to disclose the exteriority of the world, but rather to express the interiority of life’s pathos—what he calls transcendental self-affectivity. (...) To clarify Henry’s view, I examine his analysis of the abstract painting of Kandinsky, after which I illustrate the significance of Kandinsky’s abstractionism by showing how the representational paintings of Paul Signac, Andrew Harrison, Alphonse Osbert, and Henry Ossawa Tanner attempt to express the invisibility of subjectivity. I then reveal how Heidegger’s account of the work of art in terms of world disclosure overlooks the work’s task of exalting life. In closing, I accordingly suggest that Henry’s view of painting—which locates its essence in Life rather than the world—not only presents a competing position to the Heideggerian view of the origin of the work of art worthy of our attention, but one that explains how art can contribute to overcoming our age’s nihilism. (shrink)

This essay addresses the questions of whether the givenness of God is something possible, intelligible—and, if so, what such givenness might involve. In the interest of situating these questions in historical context, I first summarize Kant’s, Hegel’s, and Habermas’s respective accounts of the relationship between belief in God and philosophical knowledge. I then further situate critical philosophy’s appropriation of God by way of a discussion of how some of this appropriation’s fiercest critics—existentialists such as Sartre, Shestov, and Kierkegaard—object to its (...) gambit of using God to serve moral and cultural goals even as it denies God’s actual existence. Though this objection is a salient one, it leaves something to be desired. For although the existentialists may demonstrate what is misguided about the philosophers’ God, they do not have anything especially compelling to say about whether or how God can be given experientially. I address this aporia by exploiting what I take to be a happy intersection between the phenomenological conception of the saturated phenomenon and two moods—agape love and ecstatic joy—the mystical tradition frequently attributes to the nature of divine givenness. I argue that, when mystical experience is situated within the framework of saturated phenomena rather than within the Kantian enclosures of phenomenality, two intriguing possibilities emerge. First, it seems plausible that the religious experience of the mystic can, in principle, involve the very givenness of God that Kant and his heirs denied to be possible. Second, though phenomenology has yet to provide a complete positive portrait of the religious life, the mystical tradition emerges as a legitimate, invaluable source with which such a phenomenological portrait might begin. (shrink)

This book is an introduction to French phenomenology in the post 1945 period. Whilst many of phenomenology's greatest thinkers - Husserl, Heidegger, Sartre and Merleau-Ponty - wrote before this period, Steven DeLay introduces and assesses the creative and important turn phenomenology took after these figures. He presents a clear and rigorous introduction to the work of relatively unfamiliar and underexplored philosophers, including Jean-Louis Chrétien, Michel Henry, Jean-Yves Lacoste, Jean-Luc Marion and others. -/- After an introduction setting out the crucial (...) Husserlian and Heideggerian background to French phenomenology, DeLay explores Emmanuel Levinas’s ethics as first philosophy, Henry’s material phenomenology, Marion’s phenomenology of givenness, Lacoste’s phenomenology of liturgical man, Chrétien’s phenomenology of the call, Claude Romano’s evential hermeneutics, and Emmanuel Falque’s phenomenology of the borderlands. Starting with the reception of Husserl and Heidegger in France, DeLay explains how this phenomenological thought challenges boundaries between philosophy and theology. Taking stock of its promise in light of the legacy it has transformed, DeLay concludes with a summary of the field’s relevance to theology and analytic philosophy, and indicates what the future holds for phenomenology. -/- Phenomenology in France: A Philosophical and Theological Introduction is an excellent resource for all students and scholars of phenomenology and continental philosophy, and will also be useful to those in related disciplines such as theology, literature and French studies. (shrink)

Prokaryotic genomes of endosymbionts and parasites are examples of naturally evolved minimal cells, the study of which can shed light on life in its minimum form. Their diverse biology, their lack of a large set of orthologous genes and the existence of essential linage (and environmentally) specific genes all illustrate the diversity of genes building up naturally evolved minimal cells. This conclusion is reinforced by the fact that sometimes the same essential function is performed by genes from different evolutionary origins. (...) Nevertheless, all cells perform a set of life‐essential functions however different their cell machinery and environment in which they thrive. An upcoming challenge for biologists will be to discern, by studying differences and similarities in current biodiversity, how cells with reduced genomes have adapted while retaining all basic life‐supporting functions. (shrink)

In this essay, I argue that genuine responsibility and ethical self-understanding are possible without narrative—or, at least, that narrative is not always sufficient. In §2, I introduce and clarify a distinction between our ontological subjectivity and everyday practical identity—one made famous by Heidegger and Sartre. On the basis of this distinction, in §3 I argue that narrative is unable to ground ethical choice and decision. For, although acting in light of practical identities is something we do, it cannot wholly capture (...) what it is to be who we are. Irrespective of whatever worldly projects and identities we press into, something about our subjectivity always remains unchanged. Narrative identity, which trades merely on practical identity, thus obscures this ontological dimension of life wherein human action, decision, choice, and responsibility truly originate. By way of conclusion, in §4, I briefly examine depictions of the narrative life found within the authorships of Dostoevsky, Kierkegaard, and Voltaire, illustrating how self-narrative at times invites self-deception and annuls responsibility. A life of genuine responsibility demands more than what the most candid and best intentioned of self-narratives can supply us. Living the good life, I shall intimate, is thus not something that involves mere narrative. It depends, rather, on inwardness. (shrink)

This book is an introduction to French phenomenology in the post-1945 period. While many of phenomenology's greatest thinkers--Husserl, Heidegger, Sartre and Merleau-Ponty--wrote before this period, Steven DeLay introduces and assesses the creative and important turn phenomenology took after these figures. He presents a clear and rigorous introduction to the work of relatively unfamiliar and underexplored philosophers, including Jean-Louis Chrétien, Michel Henry, Jean-Yves Lacoste, Jean-Luc Marion and others. After an introduction setting out the crucial Husserlian and Heideggerian background to French (...) phenomenology, DeLay explores Emmanuel Levinas's ethics as first philosophy, Henry's material phenomenology, Marion's phenomenology of givenness, Lacoste's phenomenology of liturgical man, Chrétien's phenomenology of the call, Claude Romano's evential hermeneutics, and Emmanuel Falque's phenomenology of the borderlands. Starting with the reception of Husserl and Heidegger in France, DeLay explains how this phenomenological thought challenges boundaries between philosophy and theology. Taking stock of its promise in light of the legacy it has transformed, DeLay concludes with a summary of the field's relevance to theology and analytic philosophy, and indicates what the future holds for phenomenology. Phenomenology in France: A Philosophical and Theological Introduction is an excellent resource for all students and scholars of phenomenology and continental philosophy, and will also be useful to those in related disciplines such as theology, literature, and French studies. (shrink)

Taking up phenomenology’s problem of intentionality in the wake of Husserl, Jean-Paul Sartre in the introduction to Being and Nothingness says, «All consciousness, as Husserl has shown, is consciousness of something […] All consciousness is positional in that it transcends itself in order to reach an object, and it exhausts itself in this same positing». Continuing down the page, Sartre notes in turn that intentionality itself is only possible insofar as it is aware of itself. Just as an unconscious intentionality (...) is unthinkable, so too all consciousness is self-consciousness. As he thus explains, «the necessary and sufficient condition for a knowing consciousness to be knowledge of its object, is that it be consciousness of itself as being that knowledge». To pose Husserl’s problem of intentionality, hence, is to pose with it the question of self-consciousness. Sartre asks: “What is this consciousness of consciousness?” Sartre’s question— the question, in short, of what it is to be conscious of oneself—in what follows shall be ours as well. (shrink)

Slavoj Žižek often refers to an obscene excess-supplement that, depending on the subject’s pathological disposition, serves to either 1) sustain a conscious injunction by disavowing an unconscious “underside” or 2) instruct the subject to transgress the injunction. This supplemental excess is at work in neurotic and perverse belief but functions in significantly different modes depending on whether the supplement affects the ego or superego. This paper surveys and analyzes Žižek’s use of the obscene excess-supplement in his theological and political applications (...) of psychoanalytic theory. (shrink)

The definitive philosophical exploration of the work of pioneering filmmaker Terrence Malick.

Research on culture would be enriched by studying the connection between gender and peer relations. Cultures vary in the roles, privileges, opportunities and rights that are ascribed to females and males. They are known to differ also in the degree to which females and males interact with each other. Although the preference for same-gender peers has been observed across multiple cultural contexts, the degree of this segregation between females and males varies. We argue that variability in the interactional divide between (...) females and males is an important cultural construct that is likely to account for diversity in developmental processes and outcomes. (shrink)

Review of Joseph Rivera's The Contemplative Self After Michel Henry (Notre Dame: 2015).

The Alberta tar sands, and the proposed pipelines which would carry their bitumen to international markets, comprise one of the most visible environmental controversies of the early twenty-first century. Jacques Ellul’s theory of technology presents ostensibly physical phenomena, such as the tar sands, as social phenomena wherein all values are subsumed under the efficient mastery of nature. The effect of technological rationality is totalizing because technical means establish themselves as the exclusive facts of the matter, which creates a socio-political environment (...) wherein ethical engagement is precluded. Analyzing the tar sands controversy through Ellul’s hermeneutic challenges environmental ethics to a more radical stance than the continuation of the technological worldview, and thus offers meaningful and hopeful alternatives to the status quo. (shrink)

The dynamic developmental theory (DDT) has benefited from the insights of the commentators, particularly in terms of the implications for the proposed steepened delay gradients in attention-deficit/hyperactivity disorder (ADHD). The introduction of modified memory processes as a basis for the delay gradients improved the links to aspects of ADHD. However, it remains unclear whether the hyperactive-impulsive and inattentive subtypes are separate subgroups or may be explained as different outcomes of the same genetic factors and thus explicable by the (...) same principles. The DDT suggests that altered reinforcement and extinction processes define an endophenotype in ADHD that can be related dimensionally to inattention, hyperactivity, and impulsivity. The relation between the suggested endophenotype, characterized by changes in basic learning mechanisms, and other endophenotypes characterized by delay aversion or response disinhibition, needs to be tested in future studies. (shrink)

Some commentaries suggest that the attention-deficit/hyperactivity disorder (ADHD) theory of this condition does not explain enough. Because the theory includes parameters of the delay gradient that vary across individuals and developmental modulation of behavioral outcomes by different environments, it accommodates a wide range of manifestations of ADHD symptoms. Thus, the argument could instead be made that the theory allows too many degrees of freedom. For many purposes, behavior is better defined in terms of function (e.g., consequences) than in (...) terms of structure (e.g., muscle movements), so cognition is treated here as a variety of behavior rather than as a different category of phenomena. The commentaries are discussed in the context of these and other distinctions, including those between association and selection, between operant and respondent behavior, and between fundamental processes and those that are derivative. Other issues include: prosthetic environments, rapidity of developmental change, the concept of inhibition, the form of the delay gradient, and possible directions for experimental research. (shrink)