Progressive supranuclear palsy is a movement disorder with prominent tau neuropathology. Brain diseases with abnormal tau deposits are called tauopathies, the most common of which is Alzheimer's disease. Environmental causes of tauopathies include repetitive head trauma associated with some sports. To identify common genetic variation contributing to risk for tauopathies, we carried out a genome-wide association study of 1,114 individuals with PSP and 3,247 controls followed by a second stage in which we genotyped 1,051 cases and 3,560 controls for the (...) stage 1 SNPs that yielded P ≤ 10-3. We found significant previously unidentified signals associated with PSP risk at STX6, EIF2AK3 and MOBP. We confirmed two independent variants in MAPT affecting risk for PSP, one of which influences MAPT brain expression. The genes implicated encode proteins for vesicle-membrane fusion at the Golgi-endosomal interface, for the endoplasmic reticulum unfolded protein response and for a myelin structural component. © 2011 Nature America, Inc. All rights reserved. (shrink)

Pancreatitis is a complex, progressively destructive inflammatory disorder. Alcohol was long thought to be the primary causative agent, but genetic contributions have been of interest since the discovery that rare PRSS1, CFTR and SPINK1 variants were associated with pancreatitis risk. We now report two associations at genome-wide significance identified and replicated at PRSS1-PRSS2 and X-linked CLDN2 through a two-stage genome-wide study. The PRSS1 variant likely affects disease susceptibility by altering expression of the primary trypsinogen gene. The CLDN2 risk allele is (...) associated with atypical localization of claudin-2 in pancreatic acinar cells. The homozygous CLDN2 genotype confers the greatest risk, and its alleles interact with alcohol consumption to amplify risk. These results could partially explain the high frequency of alcohol-related pancreatitis in men. © 2012 Nature America, Inc. All rights reserved. (shrink)

Zusammenfassung Der Beitrag stellt eine differenzierungstheoretische Perspektive auf Sportbeteiligung und Sportinteresse der Erwachsenenbevölkerung vor. Zugrunde liegen empirische Daten aus einer eigenen repräsentativen Bevölkerungsumfrage in Deutschland vom Herbst 2003, in der die Inklusion der Erwachsenen in sämtliche gesellschaftlichen Teilsysteme ermittelt wurde. Die Inklusion in den Sport wird mit Bezug auf die sekundäre Leistungsrolle des Breitensportlers und die Publikumsrolle des Sportzuschauers betrachtet; sodann wird möglichen Zusammenhängen zwischen der Ausprägung der Inklusion in den Sport mit ungleichheitstheoretisch geläufigen Merkmalen sozialer Lage, darüber hinaus dann (...) auch mit der Ausprägung anderer Inklusionsverhältnisse nachgegangen. (shrink)

Zusammenfassung Der Beitrag stellt eine differenzierungstheoretische Perspektive auf Sportbeteiligung und Sportinteresse der Erwachsenenbevölkerung vor. Zugrunde liegen empirische Daten aus einer eigenen repräsentativen Bevölkerungsumfrage in Deutschland vom Herbst 2003, in der die Inklusion der Erwachsenen in sämtliche gesellschaftlichen Teilsysteme ermittelt wurde. Die Inklusion in den Sport wird mit Bezug auf die sekundäre Leistungsrolle des Breitensportlers und die Publikumsrolle des Sportzuschauers betrachtet; sodann wird möglichen Zusammenhängen zwischen der Ausprägung der Inklusion in den Sport mit ungleichheitstheoretisch geläufigen Merkmalen sozialer Lage, darüber hinaus dann (...) auch mit der Ausprägung anderer Inklusionsverhältnisse nachgegangen. (shrink)

Older adults often have long-term relationships, and many of their goals are intertwined with their respective partners. Joint goals can help or hinder goal progress. Little is known about how accurately older adults assess if a goal is joint, the role of over-reporting in these perceptions, and how joint goals and over-reporting may relate to older partners' relationship satisfaction and physical health. Two-hundred-thirty-six older adults from 118 couples listed their three most important goals and whether they thought of them as (...) goals they had in common with and wanted to achieve together with their partner. Two independent raters classified goals as “joint” if both partners independently listed open-ended goals of the same content. Goal progress and relationship satisfaction were assessed 1 week later. Allostatic load was calculated using nine different biomarkers. Results show that 85% self-reported at least one goal as joint. Over-reporting– the perception that a goal was joint when in fact it was not mentioned among the three most salient goals of the spouse – occurred in one-third of all goals. Multilevel models indicate that the number of externally-rated joint goals was related to greater goal progress and lower allostatic load, but only for adults with little over-reporting. More joint goals and higher over-reporting were each linked with more relationship satisfaction. In conclusion, joint goals are associated with goal progress, relationship satisfaction, and health, but the association is dependent on the domain of functioning. (shrink)

Objective: The establishment of patient-centered measures capable of empirically determining meaningful cognitive change after surgery can significantly improve the medical care of epilepsy patients. Thus, this study aimed to develop reliable change indices (RCIs) and standardized regression-based (SRB) change norms for a comprehensive neuropsychological test battery in the German language. Methods: Forty-seven consecutive patients with temporal lobe epilepsy underwent neuropsychological assessments, both before and 12 months after surgery. Practice-effect-adjusted RCIs and SRB change norms for each test score were computed. To (...) assess their usefulness, the presented methods were applied to a clinical sample, and binary logistic regression analyses were conducted to model the odds of achieving improvement in quality of life (QOL) after surgery. Results: The determined RCIs at 90% confidence intervals, and the SRB equations for each test score included in the test battery are provided. Cohen’s kappa analyses revealed a moderate mean agreement between the two measures, varying from slight to almost perfect agreement across test scores. Using these measures, a negative association between improvement in QOL and decline in verbal memory functions after surgery was detected. Significance: To the best of our knowledge, this study is the first to provide RCIs and SRB change norms necessary for the objective determination of neuropsychological change in a comprehensive test battery in the German language, facilitating the individual monitoring of improvement and decline in each patients’ cognitive functioning and psychosocial situations after epilepsy surgery. The application of the described measures revealed a strong negative association between improvement in QOL and decline in verbal memory functions after surgery. (shrink)

Warning research participants and patients about potential risks associated with participation/treatment is a fundamental part of consent. However, such risk warnings might cause negative expectations and subsequent nocebo effects (i.e., negative expectations cause negative outcomes) in participants. Because no existing review documents how past research has quantitatively examined nocebo effects – and negative expectations – arising from consent risk warnings, we conducted a pre-registered scoping review (N = 9). We identified several methodological issues across these studies, which in addition to (...) mixed findings, limit conclusions about whether risk warnings cause nocebo effects. (shrink)

This study examined cancer patients’ perceived emotional and informational support from a variety of interpersonal and media sources. We recruited patients from cancer patient association websites and online cancer forums and asked them to report to what extent they received support from interpersonal and media sources. Patients rated professional sources and personal sources as nearly equal sources of emotional support; however, professional sources were rated as significantly greater sources of informational support. Although family and oncologists were the most mentioned interpersonal (...) sources of support, they were also the most mentioned disappointing sources. Of the media sources, online interaction sources were rated as nearly equivalent sources of emotional support as interpersonal sources. That patients perceived emotional support, not only informational support, from various media sources is promising since interpersonal sources can be disappointing to some patients. (shrink)

'Hands Tied' brings together two very different films about hands: Maria Lassnig's Palmistry (1973) and Ayesha Hameed's A Rough History (of the Destruction of Fingerprints) (2016). These works are contextualised and their scope extended further by a roundtable discussion featuring participants Rachel Aumiller, Sam Dolbear, Nadine El-Enany, Amelia Groom, Clio Nicastro, Anja Sunhyun Michaelsen, and M. Ty., who discuss their relation to fate, work, pleasure, touch, and surveillance.

Socioemotional selectivity theory (SST), an influential life-span theory, suggests that older adults prefer persuasive messages that appeal to emotionally-meaningful goals over messages that appeal to knowledge-related goals, whereas younger adults do not show this preference. A mixed-factorial experiment was conducted to test whether older adults (≥65 years) differ from younger adults (25–45 years) in their preference for emotionally-meaningful appeals over knowledge-related appeals, when appeals are clearly developed in line with SST. For older adults we found the expected preference for emotionally-meaningful (...) appeals for cancer centers but not for grocery stores and travel organizations. As expected, in most cases, younger adults did not show a preference. Implications for SST-based communication research and for practice are discussed. (shrink)

This paper is intended to stimulate debate amongst stakeholders in the international research community on the topic of returning individual genetic research results to study participants. Pharmacogenetics and disease genetics studies are becoming increasingly prevalent, leading to a growing body of information on genetic associations for drug responsiveness and disease susceptibility with the potential to improve health care. Much of these data are presently characterized as exploratory (non‐validated or hypothesis‐generating). There is, however, a trend for research participants to be permitted (...) access to their personal data if they so choose. Researchers, sponsors, patient advocacy groups, ethics committees and regulatory authorities are consequently confronting the issue of whether, and how, study participants might receive their individual results. Noted international ethico‐legal guidelines and public policy positions in Europe and the United States are reviewed for background. The authors offer ‘Points‐to‐Consider’ regarding returning research results in the context of drug development trials based on their knowledge and experience. These considerations include: the clinical relevance of data, laboratory qualifications, informed consent procedures, confidentiality of medical information and the competency of persons providing results to participants. The discussion is framed as a benefit‐to‐risk assessment to balance the potential positive versus negative consequences to participants, while maintaining the integrity and feasibility of conducting genetic research studies. (shrink)

ABSTRACT This paper is intended to stimulate debate amongst stakeholders in the international research community on the topic of returning individual genetic research results to study participants. Pharmacogenetics and disease genetics studies are becoming increasingly prevalent, leading to a growing body of information on genetic associations for drug responsiveness and disease susceptibility with the potential to improve health care. Much of these data are presently characterized as exploratory (non‐validated or hypothesis‐generating). There is, however, a trend for research participants to be (...) permitted access to their personal data if they so choose. Researchers, sponsors, patient advocacy groups, ethics committees and regulatory authorities are consequently confronting the issue of whether, and how, study participants might receive their individual results. Noted international ethico‐legal guidelines and public policy positions in Europe and the United States are reviewed for background. The authors offer ‘Points‐to‐Consider’ regarding returning research results in the context of drug development trials based on their knowledge and experience. These considerations include: the clinical relevance of data, laboratory qualifications, informed consent procedures, confidentiality of medical information and the competency of persons providing results to participants. The discussion is framed as a benefit‐to‐risk assessment to balance the potential positive versus negative consequences to participants, while maintaining the integrity and feasibility of conducting genetic research studies. (shrink)

Objective: While behavioral recommendations regarding physical activity commonly focus on reaching demanding goals by proposing ‘thresholds’, little attention has been paid to the question of how much of a behavioral change is needed to make people feel that they have changed. The present research investigated this relation between actual and felt behavior change. Design: Using data from two longitudinal community samples, Study 1 and 2 comprised 614 (63 % women) and 398 participants (61 % women) with a mean age of (...) 40.9 years (SD = 13.6) and 42.5 years (SD = 13.4), respectively. Using a stage-approach, participants were classified into four groups by asking them at the respective second measurement to indicate whether they had become more physically active since their last participation six months ago (“Changers”), had tried but did not succeed in becoming more physically active (“Attempters”), were already physically active on a regular basis (“Regular Actives”), or had not tried to become more physically active (“Non-Attempters”). Physical activity was measured using the International Physical Activity Questionnaire (IPAQ), and fitness level was assessed as physical working capacity (PWC) via bicycle ergometry. Mixed ANOVAs including Time and Perceived Change as within and between factors were conducted, followed up by simple effect analyses. Results: Participants stating to have become more active in the past six months (Changers) showed a significant increase in vigorous physical activity but not in moderate physical activity, with an average of 6.8 (Study 1) and 10.6 (Study 2) MET-h per week in vigorous activity. Corroborating these findings, objective fitness also significantly increased in the group of Changers. No systematic change in moderate or vigorous physical activity was observed for the three other ‘non-changer’ groups (regular actives, attempters, non-attempters). Conclusion: The intensity of physical activity is the crucial variable for people’s perception of change in physical activity. Moderate physical activity seems not to be perceived as an effective means for behavior change. It thus might fail to unfold sufficient motivational impact, despite its known positive effects on health. (shrink)

Psychobiological responses to music have been examined previously in various naturalistic settings in adults. Choir singing seems to be associated with positive psychobiological outcomes in adults. However, evidence on the effectiveness of singing in children and adolescents is sparse. The COVID-19 outbreak is significantly affecting society now and in the future, including how individuals engage with music. The COVID-19 pandemic is occurring at a time when virtual participation in musical experiences such as singing in a virtual choir has become more (...) prevalent. However, it remains unclear whether virtual singing leads to different responses in comparison with in-person singing. We evaluated the psychobiological effects of in-person choral singing in comparison with the effects of virtual choral singing in a naturalistic pilot within-subject study. A group of children and young adolescents from a school in Salzburg, Austria were recruited to take part in the study. Subjective measures were taken pre- and post-singing sessions once a week. Additionally, salivary biomarkers and quantity of social contacts were assessed pre- and post-singing sessions every second week. Psychological stability, self-esteem, emotional competences, and chronic stress levels were measured at the beginning of in-person singing as well as at the beginning and the end of the virtual singing. We observed a positive impact on mood after both in-person and virtual singing. Over time, in-person singing showed a pre-post decrease in salivary cortisol, while virtual singing showed a moderate increase. Moreover, a greater reduction in stress, positive change in calmness, and higher values of social contacts could be observed for the in-person setting compared to the virtual one. In addition, we observed positive changes in psychological stability, maladaptive emotional competences, chronic stress levels, hair cortisol, self-contingency and quality of life. Our preliminary findings suggest that group singing may provide benefits for children and adolescents. In-person singing in particular seems to have a stronger psychobiological effect. (shrink)

Over the last decade, our appreciation of the importance of the nucleolus for cellular function has progressed from the ordinary to the extraordinary. We no longer think of the nucleolus as simply the site of ribosome production, or a dynamic subnuclear body noted by pathologists for its changes in size and shape with malignancy. Instead, the nucleolus has emerged as a key controller of many cellular processes that are fundamental to normal cell homeostasis and the target for dysregulation in many (...) human diseases; in some cases, independent of its functions in ribosome biogenesis. These extra‐nucleolar or new functions, which we term “non‐canonical” to distinguish them from the more traditional role of the nucleolus in ribosome synthesis, are the focus of this review. In particular, we explore how these non‐canonical functions may provide novel insights into human disease and in some cases new targets for therapeutic development. (shrink)

The authors led the development of a framework for ethical decision-making for an Academic Health Sciences Centre. They understood the existing mission, vision, and values statement (MVVs) of the centre as a foundational assertion that embodies an ethical commitment of the institution. Reflecting the Patient and Family Centred Model of Care the institution is living, the MVVs is a suitable base on which to construct an ethics framework. The resultant framework consists of a set of questions for each of the (...) MVVs. Users of the framework are expected to identify two or more possible decisions to address the issue at hand and then, by applying the provided sequence of questions to each, examine these options and determine the overall ethically preferable decision. The construction of such a framework requires the creative involvement of the institution’s staff. Thus the development of the framework can represent a training process in ethical decision-making as well as advance the ethical atmosphere of the institution. This novel approach has the advantage of placing the MVVs on active duty, at the centre of ethical decision-making, and lifts it from its otherwise relative obscurity in most institutions. (shrink)

Justified by spectacular achievements facilitated through applied deep learning methodology, the “Everything is possible” view dominates this new hour in the “boom and bust” curve of AI performance. The optimistic view collides head on with the “It is not possible”—ascertainments often originating in a skewed understanding of both AI and medicine. The meaning of the conflicting views can be assessed only by addressing the nature of medicine. Specifically: Which part of medicine, if any, can and should be entrusted to AI—now (...) or at some moment in the future? AI or not, medicine should incorporate the anticipation perspective in providing care. (shrink)

This study described the relationships between academic class and student moral sensitivity and reasoning and between curriculum design components for ethics education and student moral sensitivity and reasoning. The data were collected from freshman (n = 506) and senior students (n = 440) in eight baccalaureate nursing programs in South Korea by survey; the survey consisted of the Korean Moral Sensitivity Questionnaire and the Korean Defining Issues Test. The results showed that moral sensitivity scores in patient-oriented care and conflict were (...) higher in senior students than in freshman students. Furthermore, more hours of ethics content were associated with higher principled thinking scores of senior students. Nursing education in South Korea may have an impact on developing student moral sensitivity. Planned ethics content in nursing curricula is necessary to improve moral sensitivity and moral reasoning of students. (shrink)

Fox and Spector use multiple instances of the exhaustivity operator EXH to derive the correct meaning of utterances that include pitch-focus marked disjunction in downward-entailing environments. They argue that the \ operator evaluates alternatives to be used by EXH. Though the method is sound and gets the right result, we argue that the way in which EXH would need to interact with other instances of EXH, as well as other focus-sensitive elements, is at odds with how EXH is used to (...) explain other phenomena. Specifically, the analysis in Fox and Spector predicts intervention effects for cases where EXH interacts with other focus-sensitive elements. This is problematic for many cases in which EXH is used to derive the desired inferences. We propose a different way of focus association for EXH that would work for the approach introduced in Fox and Spector as well as elsewhere. In addition, our account does not require a covert element to be focused. (shrink)

Recent feminist criticism suggests that Hegel’s account of Antigone in the Phenomenology of Spirit is antithetical to feminism on two key counts: first, Hegel does not develop an authentic political representation of women’s agency and participation in the community, and second, he does not provide a model for a genuinely ethical order especially where relations between men and women are concerned. Patricia Jagentowicz Mills and Luce Irigaray are two feminist thinkers who have expressed these positions. They both take issue with (...) Hegel’s interpretation of Antigone’s actions, although each for different reasons. Mills argues that Hegel misrepresents the experience of women in the Greek community, symbolized by Antigone, as not self-conscious, unreflective, and incapable of enduring ethical conflict. The main reason for this mistaken identity, according to Mills, stems from Hegel’s beliefs that human law and man are ethically superior to divine law and woman, and that the former can legitimately rule over, indeed dominate, the latter. Irigaray asserts that the phallogocentric power of the masculine in Hegel’s text almost completely eliminates the possibility of an authentic feminine individual and action. According to this view, an autonomous feminine understanding of purpose and action is rendered impossible by the feminine’s very masculinization at the outset. At issue here is whether Antigone can indeed be understood as an ethical actor when she acts on behalf of the family and/or whether she can be understood as an ethical actor who represents the community. The conclusions drawn from these interpretations have been that, for Hegel, women are not genuine political actors, on the one hand, because their association with the family disqualifies them as such, and on the other hand, because their actions are constituted by consciousness which is masculine, and also instrumentalized for the masculine. (shrink)

Aus einer philosophisch-phanomenologischen und literaturwissenschaftlichen Perspektive heraus gewinnt Nadine Benz nahere Erkenntnisse uber das temporale Phanomen des Wartens. Zunachst wird die historische Entwicklung der Zeitvorstellung aus philosophisch-phanomenologischer Sicht thematisiert, spezifisch im Hinblick auf die Fragen nach Messbarkeit, Vermitteltheit und nach objektiven und subjektiven Komponenten von Zeiterfahrung in ihrer Aporetik. Im Anschluss wird vom Konzept der Lebenswelt zur Literatur ubergeleitet: Die vorliegende Studie bindet die Aporien der Zeit zunachst theoretisch in eine Narratologie von Zeiterfahrung ein, die vor allem den Faktor (...) des Fiktiven produktiv berucksichtigt. Schliesslich werden die gewonnenen Erkenntnisse und Instrumente fur eine Analyse von Erzahltexten des 20. und 21. Jahrhunderts fruchtbar gemacht. Hier erlangen die literarischen Konfigurationen von Wartezeit als Semantiken des Wartens fur die Subjekte der fiktiven Zeiterfahrung einen konstitutiven Status. (shrink)

This paper develops an account of the German discourse particle denn that captures the meaning contribution of this particle in polar questions, wh-questions, and certain conditional antecedents in a unified way. It is shown that the behavior of denn exhibits an asymmetry between polar and wh-interrogatives, which can be captured by treating the particle as sensitive to the property highlighted by its containing clause, in the sense of Roelofsen and Farkas :359–414, 2015). In addition, the paper argues that highlighting-sensitivity should (...) be incorporated in the account of another discourse particle, German überhaupt, and discusses how the proposed account of discourse particle denn may be extended to also cover the use of denn as a causal conjunction. (shrink)

A large number of feminist philosophers and social critics accept that Simone de Beauvoir's conception of transcendence in The Second Sex relies on masculinist ontology. In contrast with feminist interpretations that see Beauvoir claiming the success of masculinist ontology, this article argues that transcendence as masculinist ontology does not succeed in The Second Sex because it requires a relation of domination, something contrary to its own definition of freedom-producing relations. The Second Sex obliquely reveals this failure, but Beauvoir does not (...) ruminate upon it. Instead, Beauvoir turns to imagine freedom-producing gender relations in the future where the body and consciousness are already emancipated from constitutive domination. This is a future that resonates with G. W. F. Hegel's `Stoic Consciousness'. The significance of this finding is that the location of freedom neither resides in the intertwinement of the male body and consciousness previously argued to be the case, for Beauvoir, nor does it reside in the intertwinement of the female body and consciousness. Rather, freedom resides in the intertwinement of male and female bodies and consciousness where domination is already absent, that is, a place outside of history. Thus, the conclusion of The Second Sex can be read as a consolation and an escape from the inescapable limits of the present. (shrink)

Background The worldwide increase in older persons demands technological solutions to combat the shortage of caregiving and to enable aging in place. Smart home health technologies (SHHTs) are promoted and implemented as a possible solution from an economic and practical perspective. However, ethical considerations are equally important and need to be investigated. Methods We conducted a systematic review according to the PRISMA guidelines to investigate if and how ethical questions are discussed in the field of SHHTs in caregiving for older (...) persons. Results 156 peer-reviewed articles published in English, German and French were retrieved and analyzed across 10 electronic databases. Using narrative analysis, 7 ethical categories were mapped: privacy, autonomy, responsibility, human vs. artificial interactions, trust, ageism and stigma, and other concerns. Conclusion The findings of our systematic review show the (lack of) ethical consideration when it comes to the development and implementation of SHHTs for older persons. Our analysis is useful to promote careful ethical consideration when carrying out technology development, research and deployment to care for older persons. Registration We registered our systematic review in the PROSPERO network under CRD42021248543. (shrink)

With robots being introduced into caregiving, particularly for older persons, various ethical concerns are raised. Among them is the fear of replacing human caregiving. While ethical concepts like well-being, autonomy, and capabilities are often used to discuss these concerns, this paper brings forth the concept of social dignity to further develop guidelines concerning the use of robots in caregiving. By social dignity, we mean that a person’s perceived dignity changes in response to certain interactions and experiences with other persons. In (...) this paper, we will first present the concept of social dignity, and then identify a niche where robots can be used in caregiving in an ethical manner. Specifically, we will argue that, because some activities of daily living are performed in solitude to maintain dignity, a care recipient will usually prefer robotic assistance instead of human assistance for these activities. Secondly, we will describe how other philosophical concepts, which have been commonly used to judge robotic assistance in caregiving for the elderly so far, such as well-being, autonomy, and capabilities, are less useful in determining whether robotic assistance in caregiving is ethically problematic or not. To conclude, we will argue that social dignity offers an advantage to the other concepts, as it allows to ask the most pressing questions in caregiving. (shrink)

Recent feminist criticism suggests that Hegel’s account of Antigone in the Phenomenology of Spirit is antithetical to feminism on two key counts: first, Hegel does not develop an authentic political representation of women’s agency and participation in the community, and second, he does not provide a model for a genuinely ethical order especially where relations between men and women are concerned. Patricia Jagentowicz Mills and Luce Irigaray are two feminist thinkers who have expressed these positions. They both take issue with (...) Hegel’s interpretation of Antigone’s actions, although each for different reasons. Mills argues that Hegel misrepresents the experience of women in the Greek community, symbolized by Antigone, as not self-conscious, unreflective, and incapable of enduring ethical conflict. The main reason for this mistaken identity, according to Mills, stems from Hegel’s beliefs that human law and man are ethically superior to divine law and woman, and that the former can legitimately rule over, indeed dominate, the latter. Irigaray asserts that the phallogocentric power of the masculine in Hegel’s text almost completely eliminates the possibility of an authentic feminine individual and action. According to this view, an autonomous feminine understanding of purpose and action is rendered impossible by the feminine’s very masculinization at the outset. At issue here is whether Antigone can indeed be understood as an ethical actor when she acts on behalf of the family and/or whether she can be understood as an ethical actor who represents the community. The conclusions drawn from these interpretations have been that, for Hegel, women are not genuine political actors, on the one hand, because their association with the family disqualifies them as such, and on the other hand, because their actions are constituted by consciousness which is masculine, and also instrumentalized for the masculine. (shrink)

Graphical models are a powerful tool for causal model specification. Besides allowing for a hierarchical representation of variable interactions, they do not require any a priori specification of the functional dependence between variables. The construction of such graphs hence often relies on the mere testing of whether or not model variables are marginally or conditionally independent. The identification of causal relationships then solely requires some general assumptions on the relation between stochastic and causal independence, such as the Causal Markov Condition (...) and the Faithfulness Condition (Spirtes et al. 2000; Pearl 2000). However, a procedure would require further assumptions to hold. Namely those the independence tests themselves are based on. In continuous settings, Spirtes et al. (2000) suggest causal inference based on a very restrictive formulation of independence, that is, vanishing partial correlations. Such a measure does, however, limit the applicability of causal inference to linear systems. This constitutes a serious drawback especially for the social sciences where an a priori specification of the functional form proves difficult or at odds with linearity. In short: graphical models theoretically reduce specification uncertainty regarding functional dependence, but their implementation in practice deprives them of this virtue. In this paper we investigate how causal structures in continuous settings can be identified when both functional forms and probability distributions of the variables remain unspecified. We focus on tests exploiting the fact that if X and Y are conditionally independent given a set of variables Z, the two conditional densities f (X|Y, Z) and f (X|Z) must coincide. We start by estimating the conditional densities f(X|Y, Z) and f(X|Z) via nonparametric techniques (kernel methods). We proceed by testing if some metric expressing the distance between these very conditional densities is sufficiently close to zero. Out of several metrics available in the literature to express such distance we choose two, the Euclidean, and the Hellinger distance. We investigate in a Monte Carlo study how different tests involving either measure are able to detect statistical independence, conditioned on a small set of variables. One limitation may result from nonparametric density estimation being subject to the curse of dimensionality. As the number of variables increases, the estimated empirical density converges at a slower rate to its population value. To compensate this drawback we use a local bootstrap procedure which consists of resampling the data for each test. While local bootstrap strongly increases the computational time of the test, it succeeds in counterbalancing the curse of dimensionality. (shrink)