The ethical climate is the perception of health professionals about the work environment, meaning the reflection on care practices and ethical-related decisions. There are extensive studies in the international literature about the ethical climate, but there are still theoretical gaps about it in health services. In this reflection article, the objective was to explore conceptual components about the ethical climate, proposing new elements of analysis of the construct. The starting point was the accumulated knowledge itself, the possibilities for expansion, and (...) the conceptual progress emerging from contributions from studies on nursing ethics. It was understandable that the ethical climate is considered in its procedural model and cyclically, being articulated with organizational elements, as established in the literature, and, expanding the concept, with the worker’s health and the ethical expressiveness at work. Regarding this last contribution, the suggestion is to think about the potential for work to allow, limit, or favor professionals to express their ethical and esthetic values in the most daily decisions and relationships, in care, management, and education. The conceptual framework of this study progressed by addressing the ethical climate as a process articulating several concepts and elements regarding the organizational aspect, ethics, and the workers’ well-being. (shrink)

Previous research has suggested that bodily signals from internal organs are associated with diverse cortical and subcortical processes involved in sensory-motor functions, beyond homeostatic reflexes. For instance, a recent study demonstrated that the preparation and execution of voluntary actions, as well as its underlying neural activity, are coupled with the breathing cycle. In the current study, we investigated whether such breathing-action coupling is limited to voluntary motor action or whether it is also present for mental actions not involving any overt (...) bodily movement. To answer this question, we recorded electroencephalography (EEG), electromyography (EMG), and respiratory signals while participants were conducting a voluntary action paradigm including self-initiated motor execution (ME), motor imagery (MI), and visual imagery (VI) tasks. We observed that the voluntary initiation of ME, MI, and VI are similarly coupled with the respiration phase. In addition, EEG analysis revealed the existence of readiness potential (RP) waveforms in all three tasks (i.e., ME, MI, VI), as well as a coupling between the RP amplitude and the respiratory phase. Our findings show that the voluntary initiation of both imagined and overt action is coupled with respiration, and further suggest that the breathing system is involved in preparatory processes of voluntary action by contributing to the temporal decision of when to initiate the action plan, regardless of whether this culminates in overt movements. -/- . (shrink)

Subjectivity theories of consciousness take self-reference, somehow construed, as essential to having conscious experience. These theories differ with respect to how many levels they posit and to whether self-reference is conscious or not. But all treat self-referencing as a process that transpires at the personal level, rather than at the subpersonal level, the level of mechanism. -/- Working with conceptual resources afforded by pre-existing theories of consciousness that take self-reference to be essential, several attempts have been made to explain seemingly (...) anomalous cases, especially instances of alien experience. These experiences are distinctive precisely because self-referencing is explicitly denied by the only person able to report them: those who experience them deny that certain actions, mental states, or body parts belong to self. The relevant actions, mental states, or body parts are sometimes attributed to someone or something other than self, and sometimes they are just described as not belonging to self. But all are referred away from self. -/- The cases under discussion here include somatoparaphrenia, schizophrenia, depersonalization, anarchic hand syndrome, and utilization behavior; the theories employed, Higher-Order Thought, Wide Intrinsicality, and Self-Representational. Below I argue that each of these attempts at explaining or explaining away the anomalies fails. Along the way, since each of these theories seeks at least compatibility with science, I sketch experimental approaches that could be used to adduce support for my position, or indeed for the positions of theorists with whom I disagree. -/- In a concluding section I first identify two presuppositions shared by all of the theorists considered here, and argue that both are either erroneous or misleading. Second, I call attention to divergent paths adopted when attempting to explain alienation experiences: some theorists choose to add a mental ingredient, while others prefer to subtract one. I argue that alienation from experience, action, or body parts could result from either addition or subtraction, and that the two can be incorporated within a comprehensive explanatory framework. Finally, I suggest that this comprehensive framework would require self-referencing of a sort, but self-referencing that occurs solely on the level of mechanism, or the subpersonal level. In adumbrating some features of this “subpersonal self,” I suggest that there might be one respect in which it is prior to conscious experience. (shrink)

Jean Baudrillard is one of the most famous and controversial of writers on postmodernism. But what are his key ideas? Where did they come from and why are they important? This book offers a beginner's guide to Baudrillard's thought, including his views on technology, primitivism, reworking Marxism, simulation and the hyperreal, and America and postmodernism. Richard Lane places Baudrillard's ideas in the contexts of the French and postmodern thought and examines the ongoing impact of his work. Concluding with an extensively (...) annotated bibliography of the thinker's own texts, this is the perfect companion for any student approaching the work of Jean Baudrillard. (shrink)

The neurotransmitters GABA and glutamate have been suggested to play a role in Major Depressive Disorder (MDD) through an imbalance between cortical inhibition and excitation. This effect has been highlighted in higher brain areas, such as the prefrontal cortex, but has also been posited in basic sensory cortices. Based on this, magnetic resonance spectroscopy (MRS) was used to investigate potential changes to GABA+ and glutamate+glutamine (Glx) concentrations within the occipital cortex in MDD patients (n = 25) and healthy controls (n (...) = 25). No difference in occipital GABA+ or Glx concentrations, nor in the GABA+/Glx ratio, was found between groups. An analysis of an extended MDD patient and unmatched control dataset (n = 90) found no correlation between metabolite concentrations and depressive symptoms. These results were integrated with prior studies through metabolite-specific meta-analyses, revealing no difference in occipital GABA and Glx concentrations between patients and controls. An effect of publication year on GABA group differences was found, suggesting that previously reported results may have been artifacts of measurement accuracy. Taken together, our results suggest that, contrary to some prior reports, MRS measurements of occipital GABA and Glx do not differ between MDD patients and controls. (shrink)

This chapter contains sections titled: The Laws Conclusion Bibliography.

This article rejects the claim made by other scholars that Plato in the Statesman, by employing the so-called ‘architect’ (ὁ ἀρχιτέκτων) in one of the early divisions leading to the definition of political expertise, prefigured and anticipated the architectonic conception of political expertise advanced by Aristotle. It argues for an alternative reading in which Plato in the Statesman, and in the only other of his works (Gorgias) in which the word appears, closely tracks the existing social role of the architektōn, (...) who was designated as such only in virtue of appointment by a city to a role that was crucially defined as epitactic, involving overseeing the workers on site engaged in constructing some civic building works. It is this epitactic dimension of the role on which Plato relies in the Statesman, as opposed to the kind of claim to overarching integrative expertise that Aristotle would use the figure of architectonic political knowledge to make. (shrink)

Where do our ideas about politics come from? What can we learn from the Greeks and Romans? How should we exercise power? Melissa Lane teaches politics at Princeton University, and previously taught political thought at the University of Cambridge, where she was a Fellow of King's College. She has received a Guggenheim Fellowship in the field of classics, and the historian Richard Tuck called her book Eco-Republic 'a virtuoso performance by one of our best scholars of ancient philosophy.'.

Philosophical and scientific investigations of the proprietary aspects of self—mineness or mental ownership—often presuppose that searching for unique constituents is a productive strategy. But there seem not to be any unique constituents. Here, it is argued that the “self-specificity” paradigm, which emphasizes subjective perspective, fails. Previously, it was argued that mode of access also fails to explain mineness. Fortunately, these failures, when leavened by other findings (those that exhibit varieties and vagaries of mineness), intimate an approach better suited to searching (...) for an explanation. Having an alternative in hand, one that shows promise of achieving explanatory adequacy, provides an additional reason to suspend the search for unique constituents. In short, a negative and a positive thesis are developed: we should cease looking for unique constituents and should seek to explain mineness in accord with the model developed here. This model rejects attempts to explain the phenomenon in terms of either a narrative or a minimal sense of self; it seeks to explain at a “molecular” level, one that appeals to multiple, interacting dimensions. The molecular-level model allows for the possibility that subjective perspective is distinct from a stark perspective (one that does not imply mineness). It proposes that the confounding of tacit expectations plays an important role in explaining mental ownership and its complement, disownership. But the confounding of tacit expectations is not sufficient. Because we are able to be aware of the existence of mental states that do not belong to self, we require a mechanism for determining degree of self-relatedness. One such mechanism is proposed here, and it is shown how this mechanism can be integrated into a general model of mental ownership. In the spirit of suggesting how this model might be able to help resolve outstanding problems, the question as to whether inserted thoughts belong to the patient who reports them is also considered. (shrink)

Augustine is the person from the ancient world about whom we know most. He is the author of an intimate masterpiece, the Confessions, which continues to delight its many admirers. In it he writes about his infancy and his schooling in the classics in late Roman North Africa, his remarkable mother, his sexual sins ('Give me chastity, but not yet,' he famously prayed), his time in an outlawed heretical sect, his worldly career and friendships and his gradual return to God. (...) His account of his own eventual conversion is a classic study of anguish, hesitation and what he believes to be God's intervention. It has inspired philosophers, Christian thinkers and monastic followers, but it still leaves readers wondering why exactly Augustine chose to compose a work like none before it. Robin Lane Fox follows Augustine on a brilliantly described journey, combining the latest scholarship with recently found letters and sermons by Augustine himself to give a portrait of his subject which is subtly different from older biographies. Augustine's heretical years as a Manichaean, his relation to non-Christian philosophy, his mystical aspirations and the nature of his conversion are among the aspects of his life which stand out in a sharper light. For the first time Lane Fox compares him with two contemporaries, an older pagan and a younger Christian, each of whom also wrote about themselves and who illumine Augustine's life and writings by their different choices. More than a decade passed between Augustine's conversion and his beginning the Confessions. Lane Fox argues that the Confessions and their thinking were the results of a long gestation over these years, not a sudden change of perspective, but that they were then written as a single swift composition and that its final books are a coherent consummation of its scriptural meditation and personal biography. This exceptional study reminds us why we are so excited and so moved by Augustine's story. Praise for Pagans and Christians 'This open-hearted and learned book is one that any scholar of the ancient world and of early Christianity would be proud to have written... Lane Fox has opened his pages to let in an entirely new world.' Peter Brown, New York Review of Books 'A work of generous humanity and recondite erudition... of consuming interest to all of us who want to know and understand the consequences of the ancient world.' Henry Chadwick, Financial Times Praise for The Unauthorised Version 'I don't know where one would turn for an account of the Bible so clear, so lively and, in many respects, so just.' Frank Kermode, Guardian 'Magnificent... delivered with authority and verve. Learned but never pedantic, he is an unfailingly incisive, thought-provoking, humane, courteous, and often entertaining guide.' Economist. (shrink)

Bourdieu's academic work and his political interventions have always proved controversial, with reactions varying from passionate advocacy to savage critique. In the last decade of his career, the French sociologist Pierre Bourdieu became involved in a series of high-profile political interventions, defending the cause of striking students and workers, speaking out in the name of illegal immigrants, the homeless, and the unemployed, challenging the incursion of the market into the field of artistic and intellectual production. This new study presents the (...) first sustained critical analysis of the political implications of Bourdieu's sociology. Through a close reading of the political speeches and pronouncements of his later years, Jeremy F. Lane provides a detailed exposition both of Bourdieu's critique of neo-liberalism and of his own political position. Bourdieu's theory of politics is also brought into critical dialogue with the work of a range of other commentators of a broadly Marxist or post-Marxist orientation who have also intervened in such debates - theorists such as Stuart Hall, Ernesto Laclau and Chantal Mouffe, Judith Butler, Slavoj Zizek and Jacques Rancière. The first sustained analysis of Bourdieu's politics - this study will seek to assess the validity of his claims as to the distinctiveness and superiority of his own field theory as a tool of political analysis. It will be of great use to students, and researchers in sociology, social theory; cultural studies, French studies and political science. (shrink)

It is not necessarily the case that we ever have experiences of self, but human beings do regularly report instances for which self is experienced as absent. That is there are times when body parts, mental states, or actions are felt to be alien. Here I sketch an explanatory framework for explaining these alienation experiences, a framework that also attempts to explain the “mental glue” whereby self is bound to body, mind, or action. The framework is a multi-dimensional model that (...) integrates personal and sub-personal components, psychological and neural processes. I then proceed to show how this model can be applied to explain the action-related passivity experiences of persons suffering from schizophrenia. I argue that a distinctive phenomenological mark of these experiences is that they are vividly felt, unlike ordinary actions (those taken to belong to self), and I seek to explain these heightened sensory experiences from within the proposed framework. I also propose hypotheses concerning such phenomena as thought insertion and anarchic hand syndrome that are motivated by this framework. Finally, I argue that the proposed model and view of self-experiences is consistent with several aspects of and theories of consciousness, especially theories which indicate that consciousness is more likely to be engaged when we are dealing with novelty or error—e.g. when self seems to have gone missing. I conclude by recommending that if we wish to learn about self, we would be well advised to attend closely to those times when it seems absent. (shrink)

For millennia self has been conjectured to be necessary for consciousness. But scant empirical evidence has been adduced to support this hypothesis. Inconsistent explications of “self” and failure to design apt experiments have impeded progress. Advocates of phenomenological psychiatry, however, have helped explicate “self,” and employed it to explain some psychopathological symptoms. In those studies, “self” is understood in a minimalist sense, sheer “for-me-ness.” Unfortunately, explication of the “minimal self” (MS) has relied on conceptual analysis, and applications to psychopathology have (...) been hermeneutic, allowing for many degrees of interpretive latitude. The result is that MS’s current scientific status is analogous to that of the “atom,” at the time when “atom” was just beginning to undergo transformation from a philosophical to a scientific concept. Fortunately, there is now an opportunity to promote a similar transformation for “MS.” Discovery of the brain’s Default Mode Network (DMN) opened the door to neuroimaging investigations of self. Taking the DMN and other forms of intrinsic activity as a starting point, an empirical foothold can be established, one that spurs experimental research and that enables extension of research into multiple phenomena. New experimental protocols that posit “MS” can help explain phenomena hitherto not thought to be related to self, thereby hastening development of a mature science of self. In particular, targeting phenomena wherein consciousness is lost and recovered, as in some cases of Unresponsive Wakefulness Syndrome (UWS), allow for design of neuroimaging probes that enable detection of MS during non-conscious states. These probes, as well as other experimental protocols applied to NREM Sleep, General Anesthesia (GA), and the waking state, provide some evidence to suggest that not only can self and consciousness dissociate, MS might be a necessary precondition for conscious experience. Finally, these findings have implications for the science of consciousness: it has been suggested that “levels of consciousness” (LoC) is not a legitimate concept for the science of consciousness. But because we have the conceptual and methodological tools with which to refine investigations of MS, we have the means to identify a possible foundation—a bifurcation point—for consciousness, as well as the means by which to measure degrees of distance from that foundation. These neuroimaging investigations of MS position us to better assess whether LoC has a role to play in a mature science of consciousness. (shrink)

This article addresses the question of whether we should conceive of mechanisms as productive of change in a regular way. I argue that, if mechanisms are characterized as fully regular, on the one hand, then not enough processes will count as mechanisms for them to be interesting or useful. If no appeal to regularity is made at all in their characterization, on the other hand, then mechanisms can no longer be useful for grounding prediction and supporting intervention strategies. I conclude (...) that, if the New Mechanistic Philosophy is to be successful, a stochastic characterization of mechanisms must be adopted. (shrink)

In what follows, I suggest that it makes good sense to think of the truth of the probabilistic generalizations made in the life sciences as metaphysically grounded in stochastic mechanisms in the world. To further understand these stochastic mechanisms, I take the general characterization of mechanism offered by MDC :1–25, 2000) and explore how it fits with several of the going philosophical accounts of chance: subjectivism, frequentism, Lewisian best-systems, and propensity. I argue that neither subjectivism, frequentism, nor a best-system-style interpretation (...) of chance will give us what we need from an account of stochastic mechanism, but some version of propensity theory can. I then draw a few important lessons from recent propensity interpretations of fitness in order to present a novel propensity interpretation of stochastic mechanism according to which stochastic mechanisms are thought to have probabilistic propensities to produce certain outcomes over others. This understanding of stochastic mechanism, once fully fleshed-out, provides the benefits of allowing the stochasticity of a particular mechanism to be an objective property in the world, a property investigable by science, a way of quantifying the stochasticity of a particular mechanism, and a way to avoid a problematic commitment to the causal efficacy of propensities. (shrink)

A new reading of Plato’s political thought Plato famously defends the rule of knowledge. Knowledge, for him, is of the good. But what is rule? In this study, Melissa Lane reveals how political office and rule were woven together in Greek vocabulary and practices that both connected and distinguished between rule in general and office as a constitutionally limited kind of rule in particular. In doing so, Lane shows Plato to have been deeply concerned with the roles and relationships between (...) rulers and ruled. Adopting a longstanding Greek expectation that a ruler should serve the good of the ruled, Plato’s major political dialogues—the Republic, the Statesman, and Laws—explore how different kinds of rule might best serve that good. With this book, Lane offers the first account of the clearly marked vocabulary of offices at the heart of all three of these dialogues, explaining how such offices fit within the broader organization and theorizing of rule. Lane argues that taking Plato’s interest in rule and office seriously reveals tyranny as ultimately a kind of anarchy, lacking the order as well as the purpose of rule. When we think of tyranny in this way, we see how Plato invokes rule and office as underpinning freedom and friendship as political values, and how Greek slavery shaped Plato’s account of freedom. Reading Plato both in the Greek context and in dialogue with contemporary thinkers, Lane argues that rule and office belong at the center of Platonic, Greek, and contemporary political thought. (shrink)

A cursory glance at the list of Nobel Laureates for Economics is sufficient to confirm Stanovich’s description of the project to evaluate human rationality as seminal. Herbert Simon, Reinhard Selten, John Nash, Daniel Kahneman, and others, were awarded their prizes less for their work in economics, per se, than for their work on rationality, as such. Although philosophical works have for millennia attempted to describe, explicate and evaluate individual and collective aspects of rationality, new impetus was brought to this endeavor (...) over the last century as mathematical logic along with the social and behavioral sciences emerged. Yet more recently, over the last several decades, propelled by the emergence of artificial intelligence, cognitive science, evolutionary psychology, neuropsychology, and related fields, even more sophisticated approaches to the study of rationality have emerged. (shrink)

This paper transposes for evaluation in relation to the concerns of Plato’s Politicus a claim developed by Verity Harte in the context of his Philebus, that ‘external imposition of a practical aim would in some way corrupt paideutic [philosophical] knowledge’. I argue that the Politicus provides a case for which the Philebus distinction may not allow: ruling, or statecraft, as embodying a form of knowledge that can be answerable to practical norms in a way that does not necessarily subordinate or (...) corrupt its epistemic norms. I argue further that while Harte shows that the Philebus develops a view of the ethical value for a knower in being a knower, the Politicus for its part does not develop any view of the ethical value for a knower in being a ruler. (shrink)

Do participants bring their own priors to an experiment? If so, do they share the same priors as the researchers who design the experiment? In this article, we examine the extent to which self-generated priors conform to experimenters’ expectations by explicitly asking participants to indicate their own priors in estimating the probability of a variety of events. We find in Study 1 that despite being instructed to follow a uniform distribution, participants appear to have used their own priors, which deviated (...) from the given instructions. Using subjects’ own priors allows us to account better for their responses rather than merely to test the accuracy of their estimates. Implications for the study of judgment and decision making are discussed. (shrink)

Most mental disorders affect only a small segment of the population. On the reasonable assumption that minds or brains are prone to occasional malfunction, these disorders do not seem to pose distinctive explanatory problems. Depression, however, because it is so prevalent and costly, poses a conundrum that some try to explain by characterizing it as an adaptation—a trait that exists because it performed fitness-enhancing functions in ancestral populations. Heretofore, proposed evolutionary explanations of depression did not focus on thought processes; instead, (...) they emphasized that it facilitates navigation of adverse social circumstances or promotes immune response to infectious agents. According to a new hypothesis, the “analytical rumination hypothesis” (ARH), however, depression’s crucial adaptive trait is rumination—negative, intrusive thought. ARH holds that, (i) social dilemmas trigger depressed mood; (ii) depressed mood induces changes in body systems that facilitate ruminative analysis aimed at solving dilemmas; and, (iii) depressive rumination is a fitness-enhancing trait that was selected for in evolutionary time. Jointly, (i)~(iii) imply that we should not think of rumination as a disorder; instead, it is a trade-off, an eminently rational one. In the same way that fever solves a problem—coordination of the immune system in response to infection—so too does depressive rumination solve a problem, a social dilemma, albeit at the cost of inducing anhedonia and other maladies. But they argue that the cost is worthwhile, something that should be endured “until the problem is solved.” First, we argue that there are two distinct types of rumination, brooding and pondering; the former is associated with a disposition for depression, not the latter. But only the latter has the problem-solving capabilities that ARH requires. Second, recent brain imaging studies of depression reveal resting state hypoactivity in lateral regions and hyperactivity in paralimbic regions; this asymmetric pattern correlates with heightened levels of brooding, self-focused rumination. In other words, on the personal level, patients are trapped within self, isolated from the external world and suffused with negative affect; on the subpersonal level, this pattern is reflected by an asymmetric pattern of lateral vs. paralimbic resting state activity. Third, we proceed to conjecture that rational responses (e.g., pondering) to social dilemmas are those that strike a balance between internal and external considerations in the process of belief formation. Fourth, because the asymmetric resting state activity blocks those who suffer with depression from accessing and processing potentially positive stimuli from the external world, the capacity for rational, analytic response—hence, problem-solving—is constrained. Fifth, it follows that, although there might be conditions for which suffering should be endured rather than pharmacologically alleviated, depression is not one of those. Indeed, in view of the effects of the asymmetric resting state pattern, it is unlikely that depressive rumination would have been useful even for ancestral populations. (shrink)

Normal 0 false false false MicrosoftInternetExplorer4 st1:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} In order to see whether there is a common European model that gives a place to religion in the public sphere two issues have to be taken into account: first, if there is a theory of secularization that accurately describes the current situation of European societies and second (...) if, there is a European model on Church – State relationship. The first part is dedicated to the different accounts on secularization that may be applied to European countries: the classical Weber theory that view secularization as an “iron law” of any society, the institutional secularization, secularization as the decline and adequacy of religious practice, the continuation of the classical theory in the 60’s and beyond, the criticism of this theory and the particular argument of the increase of fundamentalist religious movements. The attempts to formulate new theories on secularization based on other assumptions than the classical one are also presented. The increased presence of religion in private life does not mean a decrease of religion in the public space but rather a new definition of it. Despite the different intensity of belief in national terms, some trends like “believing without belonging” are common, meaning that secularization could have a single meaning in Europe, apart from other continents. The second part starts with presenting the three types of Church - State relationship at the national level. All these have in common the fact that the state is neutral towards religious subjects, a religious subsection is singled out within the public sphere and the state has the right to intervene in this area only as an arbiter. There is already a European law on religion and this statement is supported by examples from the Lisbon Treaty, The Charter of Fundamental Rights, different Directives and decisions of the European Court of Justice. Common rules on religion agreed at the European level helps better to understand why there is a common European model on religions, different from the national models. After taking into account the two aspects described above, a common European model on religion in the public sphere emerges as a necessary conclusion. (shrink)

Following the violent protests in the Republic of Moldova against the Communist Party – governing since 2001 – that took place in April 2009, after the release of the parliamentary elections results, the Romanian Government has adopted the measure of simplifying the fundamental and formal conditions for regaining Romanian citizenship through Government Emergency Ordinance (GEO) No. 36/2009 for modifying and completing Law on Citizenship No. 21/1991. This measure is focusing particularly on the citizens of the Republic of Moldova who wish (...) to be granted Romanian citizenship. By presenting the changes brought by GEO No. 36/2009, by comparing them to the other changes made to Law No. 21/1991 in 2007 and 2008, this article tries to answer the question of how the system of granting and regaining Romanian citizenship should be regulated, taking into account the Romanian accession to the European Union and the necessity to discard the consequences of the Ribbentrop – Molotov Pact, which was officially condemned by the Romanian Parliament in 1991. The de lege ferenda proposals made in this article have the purpose to make the system of acquiring Romanian citizenship more transparent and easier to explain to the entitled persons and to the European Union institutions monitoring the legal and illegal migration. (shrink)

Neurovascular coupling (NVC), the transient regional hyperemia following the evoked neuronal responses, is the basis of blood oxygenation level-dependent techniques and is generally adopted across physiological conditions, including the intrinsic resting state. However, the possibility of neurovascular dissociations across physiological alterations is indicated in the literature. To examine the NVC stability across sleep–wake states, we used electroencephalography (EEG) as the index of neural activity and functional magnetic resonance imaging (fMRI) as the measure of cerebrovascular response. Eight healthy adults were recruited (...) for simultaneous EEG-fMRI recordings in nocturnal sleep. We compared the cross-modality (EEG vs. fMRI) consistency of functional indices (spectral amplitude and functional connectivity) among five states of wakefulness and sleep (state effect). We also segregated the brain into three main partitions (anterior, middle and posterior) for spatial assessments (regional effect). Significant state effects were found on δ, α and fMRI indices and regional effects on the α and fMRI indices. However, the cross-state EEG changes in spectral amplitude and functional connectivity did not consistently match the changes in the fMRI indices across sleep–wake states. In spectral amplitude, the δ band peaked at the N3 stage for all brain regions, while the fMRI fluctuation amplitude peaked at the N2 stage in the central and posterior regions. In regional connectivity, the inter-hemispheric connectivity of the δ band peaked at the N3 stage for all regions, but the bilateral fMRI connectivity showed the state changes in the anterior and central regions. The cross-modality inconsistencies across sleep–wake states provided preliminary evidence that the neurovascular relationship may not change in a linear consistency during NREM sleep. Thus, caution shall be exercised when applying the NVC presumption to investigating sleep/wake transitions, even among healthy young adults. (shrink)

Neural activity varies continually from moment to moment. Such temporal variability (TV) has been highlighted as a functionally specific brain property playing a fundamental role in cognition. We sought to investigate the mechanisms involved in TV changes between two basic behavioral states, namely having the eyes open (EO) or eyes closed (EC) in vivo in humans. To these ends we acquired BOLD fMRI, ASL, and [18F]-fluoro-deoxyglucose PET in a group of healthy participants (n = 15), along with BOLD fMRI and (...) [18F]-flumazenil PET in a separate group (n = 19). Focusing on an EO- vs EC-sensitive region in the occipital cortex (identified in an independent sample), we show that TV is constrained in the EO condition compared to EC. This reduction is correlated with an increase in energy consumption and with regional GABAA receptor density. This suggests that the modulation of TV by behavioral state involves an increase in overall neural activity that is related to an increased effect from GABAergic inhibition in addition to any excitatory changes. These findings contribute to our understanding of the mechanisms underlying activity variability in the human brain and its control. (shrink)

Objective Manic and depressive phases of bipolar disorder (BD) show opposite psychomotor symptoms. Neuronally, these may depend on altered relationships between sensorimotor network (SMN) and subcortical structures. The study aimed to investigate the functional relationships of SMN with substantia nigra (SN) and raphe nuclei (RN) via subcortical-cortical loops, and their alteration in bipolar mania and depression, as characterized by psychomotor excitation and inhibition. -/- Method In this resting-state functional magnetic resonance imaging (fMRI) study on healthy (n = 67) and BD (...) patients (n = 100), (1) functional connectivity (FC) between thalamus and SMN was calculated and correlated with FC from SN or RN to basal ganglia (BG)/thalamus in healthy; (2) using an a-priori-driven approach, thalamus-SMN FC, SN-BG/thalamus FC, and RN-BG/thalamus FC were compared between healthy and BD, focusing on manic (n = 34) and inhibited depressed (n = 21) patients. -/- Results (1) In healthy, the thalamus-SMN FC showed a quadratic correlation with SN-BG/thalamus FC and a linear negative correlation with RN-BG/thalamus FC. Accordingly, the SN-related FC appears to enable the thalamus-SMN coupling, while the RN-related FC affects it favoring anti-correlation. (2) In BD, mania showed an increase in thalamus-SMN FC toward positive values (ie, thalamus-SMN abnormal coupling) paralleled by reduction of RN-BG/thalamus FC. By contrast, inhibited depression showed a decrease in thalamus-SMN FC toward around-zero values (ie, thalamus-SMN disconnection) paralleled by reduction of SN-BG/thalamus FC (and RN-BG/thalamus FC). The results were replicated in independent HC and BD datasets. -/- Conclusions These findings suggest an abnormal relationship of SMN with neurotransmitters-related areas via subcortical-cortical loops in mania and inhibited depression, finally resulting in psychomotor alterations. (shrink)

Time is an essential feature in bipolar disorder (BP). Manic and depressed BP patients perceive the speed of time as either too fast or too slow. The present article combines theoretical and empirical approaches to integrate phenomenological, psychological, and neuroscientific accounts of abnormal time perception in BP. Phenomenology distinguishes between perception of inner time, ie, self-time, and outer time, ie, world-time, that desynchronize or dissociate from each other in BP: inner time speed is abnormally slow (as in depression) or fast (...) (as in mania) and, by taking on the role as default-mode function, impacts and modulates the perception of outer time speed in an opposite way, ie, as too fast in depression and too slow in mania. Complementing, psychological investigation show opposite results in time perception, ie, time estimation and reproduction, in manic and depressed BP. Neuronally, time speed can be indexed by neuronal variability, ie, SD. Our own empirical data show opposite changes in manic and depressed BP (and major depressive disorder [MDD]) with abnormal SD balance, ie, SD ratio, between somatomotor and sensory networks that can be associated with inner and outer time. Taken together, our combined theoretical-empirical approach demonstrates that desynchronization or dissociation between inner and outer time in BP can be traced to opposite neuronal variability patterns in somatomotor and sensory networks. This opens the door for individualized therapeutic “normalization” of neuronal variability pattern in somatomotor and sensory networks by stimulation with TMS and/or tDCS. (shrink)