Theories of the representation of specific kinetic and spatiotem-poral features of movement range from the explicit assertion that temporal aspects of movement are not represented to the idea that they are represented and that they have neurophysiological correlates. Jeannerod's thesis is that mental and visual images have common mechanisms and that there is a link between the image to move and the mechanisms involved with movement. The target article takes the position that certain parameters are coded in motor representations but (...) that the duration of an action is not one of them. This position is based on the work of Gottlieb et al. and of Decety et al.. Both these studies are worth considering in detail. In Note 1, Jeannerod suggests that: “in time-constrained tasks subjects control the amplitude parameter of force impulses, whereas in spatially constrained tasks the duration of the force impulse is affected by accuracy demands.” This is not exactly correct. Excitation pulse intensity is modulated both in tasks that require spatial and those that require temporal accuracy. Excitation pulse duration is modulated for changes in movement distance and inertial load. If subjects are required to be very accurate spatially, they will move at less than maximum speed for a given distance and this is achieved by lower levels of excitation intensity. (shrink)

This study examined the challenges for supervisors and managers of managing sick leave within a New Zealand university. We used a qualitative research design, interviewing 20 university staff across the academic and service divisions who had managerial roles. We applied Habermas’ distinctions of technical instrumental, practical relational, and emancipatory critical transformative interests, and his twofold distinction of system and lifeworld to our analysis. The primary findings suggest that while the technical instrumental discourses were dominant within the university bureaucracy, managers drew (...) upon practical relational and emancipatory critical transformative discourses to justify the considerable discretion they exercised in managing sick leave. Far from being incidental, these humanistic elements are as much a part of the bureaucracy as the rational elements and are fundamental to the system’s equilibrium. (shrink)

A theory is presented to explain how accurate, single-joint movements are controlled. The theory applies to movements across different distances, with different inertial loads, toward targets of different widths over a wide range of experimentally manipulated velocities. The theory is based on three propositions. (1) Movements are planned according to “strategies” of which there are at least two: a speed-insensitive (SI) and a speed-sensitive (SS) one. (2) These strategies can be equated with sets of rules for performing diverse movement tasks. (...) The choice between SI and SS depends on whether movement speed and/or movement time (and hence appropriate muscle forces) must be constrained to meet task requirements. (3) The electromyogram can be interpreted as a low-pass filtered version of the controlling signal to the motoneuron pools. This controlling signal can be modelled as a rectangular excitation pulse in which modulation occurs in either pulse amplitude or pulse width. Movements to different distances and with loads are controlled by the SI strategy, which modulates pulse width. Movements in which speed must be explicitly regulated are controlled by the SS strategy, which modulates pulse amplitude. The distinction between the two movement strategies reconciles many apparent conflicts in the motor control literature. (shrink)

Research on self-determination theory and clinical models such as acceptance and commitment therapy has shown that behaving in line with our values is key to maintaining healthy well-being. Combining work on values and experimental studies on moral hypocrisy and well-being, we experimentally tested how behaving incongruently with values affects well-being. We hypothesized that discrepancies between how one thinks one should have behaved and how one reported one did behave would be more detrimental to well-being when the behaviors were value-expressive and (...) motivationally coherent compared to a control condition; greater perceived gaps between how participants feel they should have acted and how they report they did act would be associated with more negative well-being outcomes; the relationship between value manipulation and well-being would be mediated by perceived behavioral gap; and that personal values would interact with value manipulation to produce differential effects on well-being. One-hundred and fifty-eight first-year psychology students participated in an experiment designed to highlight discrepancies between how participants have behaved in accordance with a certain value and how they think they should have behaved, before reporting their well-being. As hypothesized, greater discrepancies between reported past behavior and how participants thought they should have behaved was associated with negative affect and decreased reports of positive well-being. We found no evidence for differential effects of manipulated value-expressive behaviors on well-being, or for our hypotheses that personal values and manipulated value-expressive behaviors interact. Nevertheless, value content mattered in terms of inducing perceived behavioral gaps. Our study suggests that perceived discrepancies between any value and reported past behavior can have a negative impact on some aspects of well-being. We discuss how the application of our methodology can be used in further studies to disentangle the value-behavior nexus. (shrink)

Applied to video games, Csikszentmihalyi’s work on flow evidences that a positive gaming experience is intrinsically self-rewarding and primarily determined by the skill/challenge balance. A multi-layered measure of enjoyment is built to take these components into account. Gamers were asked to report the concentration-enjoyment they experienced during a first-person shooter game, and to better assess the gap between skill and challenge, the challenge enjoyment was also rated. Along with concentration level, concentration enjoyment is used to build a gaming experience typology (...) that accounts for the self-rewarding component. An enjoyment-based challenge mapping is also drawn up, crossing challenge enjoyment and challenge level. The results show that this integrative enjoyment measure strengthens the causal link between challenge and gaming experience. Most importantly, the findings suggest that challenge or concentration-based enjoyment measures outweigh the standard concentration and difficulty measures as they are more likely to ensure a pleasant and positive experience (flow or relaxation) for the gamers. Indeed, regardless of the reported level of challenge, a gamer is more likely to have a positive experience when challenged at a level she perceives as pleasant. This article emphasizes the importance for game publishers of gathering enjoyment-based concentration and challenge assessments to ensure a positive gaming experience and gamers’ commitment. (shrink)

The conservative strategy proposed by the authors suggests a solution of the degrees-of-freedom problem of the controller. However, several simple motor control tasks cannot be explained by this strategy. A nonconservative strategy, in which more parameters of the control signal vary, can account for these simple motor tasks. However, the simplicity that distinguishes the proposed model from many others is lost.

Reprenant les principales dimensions psychopathologiques participant à la compréhension des conduites addictives alimentaires, et les articulant avec les mécanismes neurobiologiques générant et entretenant une véritable addiction, nous privilégions une approche psychosomatique qui permette d’éclairer certaines données cliniques, d’affiner nos attitudes thérapeutiques et d’ouvrir notre réflexion à des perspectives de recherche nouvelle. Dans une approche étiopathogénique, transnosographique, intégrant l’impact de l’environnement socioculturel et des dimensions transgénérationnelles, nous avons évoqué, dans le dysfonctionnement des interrelations précoces et ses conséquences sur le développement de (...) l’enfant et le processus d’adolescence, une hypothèse centrale dans les conduites addictives alimentaires : la défaillance du maternel chez les mères des patientes, en particulier dans l’investissement du corps autonome, vivant et érotique de l’enfant. Cette défaillance ne favoriserait pas une bonne intégration du féminin chez le sujet et participerait à l’avènement d’une organisation sadomasochiste qui le fixe à ses objets infantiles. Sur la base de ces modalités de construction identitaire, nous avons abordé la génèse de ces conduites en soulignant successivement le développement, du fait du défaut de contenant maternel (pare-excitant, organisateur et liant des motions pulsionnelles de l’enfant), d’une organisation dépressiveantidépressive (dépressivité), témoin d’une rupture du développement; celui d’une inactivation partielle, et dans certains domaines, des processus de mentalisation défensive du rapproché relationnel vécu comme emprise (alexithymie). L’organisation symptomatique évolue, selon nous, vers une modalité corporelle et comportementale de régulation de l’équilibre du sujet afin de parer à un risque dépressif ou de désorganisation. Ce processus de régulation touche le système plaisir-déplaisir avec la génèse d’un autosadisme et d’un masochisme moral, source d’une jouissance endogène « à défaut ». Ces dimensions ouvrent la voie à un frayage psychosomatique d’autant que les « solutions » névrotiques et perverses sont en échec, et qu’une pathologie organique secondaire à la conduite constitue un point d’appel de substitution d’une invalidité physique à une invalidité psychique. (shrink)

Both Peirce and Popper thought about the darwinian theory of evolution. From different perspectives they coincided in stating that natural selection is a non productive factor of biological evolution. Each of them put forward an active agent other than natural selection in the evolutionary process.

According to the traditional account Mendel's paper on pea hybrids reported a study of inheritance and its laws. Hence, Mendel came to be known as The Father of Genetics. This paper demonstrates that, in fact, Mendel's objective in his research was finding the empirical laws which describe the formation of hybrids and the development of their offspring over several generations. Having found these laws (and not the laws of inheritance that he is generally credited with) he proposed a theoretical scheme (...) involving the formation of germinal and pollen cells in hybrids and their combination in fertilization competent to explain why his laws took the form that they did. Mendel's research shows a pattern of development closely paralleling the stages of empirical investigation beginning at the level of qualitative description in common language rising through four levels of increasing abstraction and culminating in a fifth level, his simple mechanical theory. This mechanism met all the tests that a theory of this type must pass. In that respect Mendel was highly successful and this success might be the reason why he did not push his theory to a higher level, a sixth level involving the use of particulate determiners; despite this fact, Mendel was credited with having taken exactly that step. (shrink)

In the United States, disease screening is offered to the public as a consumer service. It has been proposed that the act of “consumption” is a manifestation of agency and that the decision to consume is an exercise of autonomy. The enthusiasm of the American public for disease screening and the expansion in the demand for all sorts of disease screening in recent years can be viewed as an expression of such autonomy. Here, we argue that the enthusiasm for disease (...) screening witnessed in the American public today may be more a reflection of the constraint on autonomy than its facilitation. It is our opinion that the articulation of socio-historical processes has contributed to a moral imperative which is reflected in the decision making of individuals around disease screening. We suggest medical and health professionals have a responsibility to facilitate the exercise of individual autonomy in health care decision making as an integral component of professional obligation. These professionals need to problematise healthcare activities that constrain individual autonomy. (shrink)

Vaccine hesitancy or refusal has been one of the major obstacles to herd immunity against Covid-19 in high-income countries and one of the causes for the emergence of variants. The refusal of people who are eligible for vaccination to receive vaccination creates an ethical dilemma between the duty of healthcare professionals (HCPs) to care for patients and their right to be taken care of. This paper argues for an extended social contract between patients and society wherein vaccination against Covid-19 is (...) conceived as essential for the protection of the right of healthcare providers to be taken care of. Thus, a duty of care is only valid when those who can receive vaccination actually receive it. Whenever that is not the case, the continuing functioning of HCPs can only be perceived as supererogatory and not obligatory. (shrink)

The twelfth edition of this classic text has built upon the success of previous editions and has been thoroughly updated and revised to give students a deeper understanding and appreciation of the core principles of Economics. Suitable for beginners, Economics is accessible but has a rigour that will stretch readers to achieve their full potential. In-depth explanations of key theoretical concepts are balanced with a wide range of real-world examples to help students understand and apply their knowledge. Online Resource Centre (...) For students: - Self-test questions - Economics in the news - Interactive chapters - Web links - Flashcard glossary - Authors' blog For lecturers: - Animated PowerPoint slides - Instructor's manual - Test bank - Figures from the text. (shrink)

We conducted a rapid review and quantitative summary of meta-analyses that have examined interventions which can be used by individuals during quarantine and social distancing to manage anxiety, depression, stress and subjective well-being. A literature search yielded 34 meta-analyses (total number of studies k = 1,390, n = 145,744) that were summarized. Overall, self-guided interventions showed small to medium effects in comparison to control groups. In particular, self-guided therapeutic approaches (including cognitive-behavioral, mindfulness, and acceptance-based interventions), selected positive psychology interventions, and (...) multi-component and activity-based interventions (music, physical exercise) showed promising evidence for effectiveness. Overall, self-guided interventions on average did not show the same degree of effectiveness as traditional guided individual or group therapies. There was no consistent evidence of dose effects, baseline differences and differential effectiveness of eHealth interventions. More research on the effectiveness of interventions in diverse cultural settings is needed. (shrink)

Several researchers point to disorganized attachment as a core feature of borderline personality disorder (BPD). However, recent studies suggest that specific internal working models (IWMs) of each parent combine to account for child outcomes and that a secure relationship with one parent can protect against the deleterious effects of an insecure relationship with the other parent. It was thus hypothesized that adolescents with BPD are more likely to be disorganized with both their parents, whereas non-clinical controls are more secure with (...) at least one of their caregivers. Thirty-six adolescents with BPD and 30 control participants (aged 13-19) were included. Psychiatrist diagnosis was verified with the SIDP-IV and comorbidity was assessed using the Kiddie-SADS. Reported trauma was assessed with the Childhood Trauma Questionnaire. Attachment IWMs of each parent were assessed with the Attachment Multiple Model Interview (AMMI), which enables separate coding for each attachment figure and in which disorganization is conceptualized as conflicting attachment strategies within a specific relationship. Results of a logistic regression analysis suggested that beyond insecure attachment, being disorganized not just with one but with both parents is particularly characteristic of adolescents with BPD. Conversely, belonging to the non-clinical group was predicted by higher security scores with the father and lower deactivation with the mother. Although higher levels of childhood abuse or neglect were reported by adolescents with BPD, the retained attachment dimensions predicted group membership over and above reported trauma. These findings have important implications for clinical intervention and highlight the protective role fathers may have. (shrink)

There is very little literature on the actual decision-making frameworks used by general practitioners with respect to ethical issues and virtually none on the impact of personal experiences of illness on this. This study aimed to investigate what these frameworks might be and if and how they were altered by doctors’ own illness experience. Twenty general practitioners were recruited, 10 having had a previous serious medical illness and 10 having no such history. They participated in a semi-structured interview, including case (...) vignettes, recorded and analysed using qualitative thematic analysis. Being a patient themselves altered general practitioners’ decision-making by enhancing physician empathy, increasing ease at discussing difficult topics, having a greater willingness to support patient choice and a wider ability to provide a greater diversity of therapeutic strategies, with the role of empathy being the most noticeable difference between the groups. Doctors who had not had a severe personal illnes... (shrink)

Glover postulates that the inferior parietal lobule (IPL), along with the frontal lobes and basal ganglia, mediates planning, while the superior parietal lobule (SPL), coupled with motor processes in the cerebellum, regulates the control process. We demonstrate that the control process extends beyond the cerebellum and SPL into regions hypothesized to represent planning.

Mendel's work in hybridization is ipso facto a study in inheritance. He is explicit in his interest to formulate universal generalizations, and at least in the case of the independent segregation of traits, he formulated his conclusions in the form of a law. Mendel did not discern, however, the inheritance of traits from that of the potential for traits. Choosing to study discrete non-overlapping traits, this did not hamper his efforts.

Né d'un projet évoqué au Congrès international des Sciences historiques de Montréal (1995), paru à l'occasion du trentième anniversaire du Coordinating Committee on Women in the Historical Profession (CCWHP), cet ouvrage est constitué de vingt récits de vie qui mêlent le personnel, le politique et le professionnel. De Gerda Lerner (réfugiée juive, pionnière de l'histoire des femmes aux États-Unis) à Chrystal Feimster (jeune femme noire qui achève sa thèse à Princeton), toutes les femme...

Né d'un projet évoqué au Congrès international des Sciences historiques de Montréal (1995), paru à l'occasion du trentième anniversaire du Coordinating Committee on Women in the Historical Profession (CCWHP), cet ouvrage est constitué de vingt récits de vie qui mêlent le personnel, le politique et le professionnel. De Gerda Lerner (réfugiée juive, pionnière de l'histoire des femmes aux États-Unis) à Chrystal Feimster (jeune femme noire qui achève sa thèse à Princeton), toutes les femme...