Psicología del «efecto placebo» y fundamentos para su uso clínico intencionado

Resumen

Este es un trabajo de discusión teórica que indaga sobre la psicología del «efecto placebo» (EP) y las posibilidades de su recuperación clínica. Tiene cuatro partes.

En la primera, se exponen los resultados básicos, conforme a las pautas estándar e inversa en la ocurrencia del EP. En la segunda se revisan críticamente las explicaciones en términos de sugestión y de expectativas-atribución. En la tercera, se desarrolla una teoría interconductual, con particular referencia al condicionamiento, a la farmacología conductual y a los sistemas endorfino e inmunitario.

Finalmente, en la parte cuarta se indican diversas posibilidades teóricas y empíricas para el uso clínico intencionado del EP, tanto en medicina como en psicología clínica.     

Overt head movements moderate the effect of depressive symptoms on mood regulation

A dysfunction in the regulation of negative mood states is one of the core symptoms of depression. Research has found that levels of depression are associated with the intensity of the mood-regulation deficit. The present study aimed to explore the role the body plays in mood-regulation processes. More specifically, we studied whether head movements can influence mood persistence in dysphoric states. Subsequent to a sad-mood induction, participants were presented with a set of positive pictures immediately after performing either vertical (i.e., nodding) or lateral (i.e., shaking) head movements. We considered changes in mood from before to after the experimental task as an index of the effectiveness of mood regulation. As expected, the results showed that higher initial levels of depressive symptoms were associated with greater persistence of sad mood. More importantly, this association was present in participants who shook their heads, but not in those who nodded. These results show that body movements can contribute to mood-regulation processes, thus expanding our knowledge of the psychopathology of mood disorders.     

Facial emotion recognition in Williams syndrome and Down syndrome: A matching and developmental study

In this study both the matching and developmental trajectories approaches were used to clarify questions that remain open in the literature on facial emotion recognition in Williams syndrome (WS) and Down syndrome (DS). The matching approach showed that individuals with WS or DS exhibit neither proficiency for the expression of happiness nor specific impairments for negative emotions. Instead, they present the same pattern of emotion recognition as typically developing (TD) individuals. Thus, the better performance on the recognition of positive compared to negative emotions usually reported in WS and DS is not specific of these populations but seems to represent a typical pattern. Prior studies based on the matching approach suggested that the development of facial emotion recognition is delayed in WS and atypical in DS. Nevertheless, and even though performance levels were lower in DS than in WS, the developmental trajectories approach used in this study evidenced that not only individuals with DS but also those with WS present atypical development in facial emotion recognition. Unlike in the TD participants, where developmental changes were observed along with age, in the WS and DS groups, the development of facial emotion recognition was static. Both individuals with WS and those with DS reached an early maximum developmental level due to cognitive constraints.     

Interfacial waves between two magneto-electro-elastic half-spaces with magneto-electro-mechanical imperfect interface

The propagation of shear horizontal waves between the interface of two magneto-electro-elastic materials with an magneto-electro-mechanical imperfect contact has been studied. Mechanical, electrical and magnetical imperfections are modelled by means of a spring, a capacitor and an inductor, respectively. A general expression for the dispersion relation is given in an explicit form. Some limit cases are analysed in detail. The influence of imperfect contacts is shown in some numerical results.     

Impact of Organizational Citizenship Behavior on Performance in Women's Sport Teams

The current study examined the relationship between organizational citizenship behavior and sport team performance and the moderating role of task interdependence in that relationship. Two types of collegiate teams—softball (N = 25) and tennis (N = 15)—were utilized to represent different levels of task interdependence with softball being considered more interdependent than tennis. Athletes (N = 448) answered survey questions concerning organizational citizenship behavior (helping, civic virtue, sportsmanship [due to the historic use of the term “sportmanship” in developing the measures used in this study, that term will be used instead of “sportpersonship”]), team cohesiveness, athlete satisfaction, and transformational leadership behaviors. Researchers collected performance statistics for athletes. Results indicated that helping behavior was the strongest organizational citizenship behavior predictor of performance, but the effect differed between tennis and softball teams.     

Rethinking Concepts in Participatory Action Research and Their Potential for Social Transformation: Post‐structuralist Informed Methodological Reflections from LGBT and Trans‐Collective Projects

Participatory Action Research (PAR) aims to articulate knowledge production and transformative action. In this paper, we outline the sociopolitical background to our interest in LGBT and trans‐collectives as an important territory where PAR might make some intervention in the social conditions of LGBT lives by transforming dominant forms of representation that have emerged from a history of psychological and medical pathology. We present two projects, from UK and Spain that utilize post‐structuralist informed methods (interviews, photo‐production, discourse analysis, narrative production) within a PAR framework. We examine their potential for problematising representations of sexuality and gender by reflecting on the knowledge produced and the transformative action they provoke. We rethink power relationships inherent in PAR concepts of ‘participation’ and ‘empowerment’ through a post‐structuralist lens and argue that the achievements of PAR projects can be better understood as ‘co‐produced artifacts’. These (e.g. photo‐exhibition) are co‐owned by community members and researchers and their deployment in different settings (e.g. community or university) impacts on the meanings they convey and the action they provoke. Finally, we argue that through the use of post‐structuralist methods PAR can enable effective transformative action, but caution against the practice of reinstating normative representations in the invitation to participate under specific identity categories (e.g. LGBT, Trans, mental health service user). PAR projects can do this by considering naturalized definitions of who is vulnerable or marginalized as the object and field of social transformation, and the starting point for collective and political action. Copyright © 2012 John Wiley & Sons, Ltd.     

Monitoring the source monitoring

The hypothesis that the retrieval of correct source memory cues, those leading to a correct source attribution, increases confidence, whereas the retrieval of incorrect source memory cues, those leading to a source misattribution, decreases confidence was tested. Four predictions were derived from this hypothesis: (1) confidence should be higher for correct than incorrect source attribution except; (2) when no source cues are retrieved; (3) only the source misattributions inferred from the retrieval of incorrect source cues will be rated with low confidence; and (4) the number of source cues retrieved, either correct or incorrect, will affect the confidence in the source attributions. To test these predictions, participants read two narratives from two witnesses to a bank robbery, a customer and a teller. Then, participants completed a source monitoring test with four alternatives, customer, teller, both, or neither, and rated their confidence in their source attribution. Results supported the first three predictions, but they also suggested that the number of correct source monitoring cues retrieved did not play a role in the monitoring of the accuracy of the source attributions. Attributions made from the recovery of incorrect source cues could be tagged as dubious or uncertain, thus leading to lowered confidence irrespective of the number of incorrect source cues or whether another correct source cue was also recovered. This research has potential applications for eyewitness memory because it shows that confidence can be an indicator of the accuracy of a source attribution.     

The role of inhibition in young children’s altruistic behaviour

By behaving altruistically, individuals voluntarily reduce their benefits in order to increase their partners’. This deviation from a self-interest-maximizing function may be cognitively demanding, though. This study investigates whether altruistic sharing in 4- to 6-year-old children, assessed by a dictator game (DG), is related to three measures of executive functioning, that is, inhibitory control, working memory, and cognitive flexibility. We found that children who turned out to be altruistic in the DG performed better on an inhibition task than non-altruists did. This finding lends support to the hypothesis that altruistic sharing might be somewhat constrained by the child’s ability to inhibit a natural tendency to preserve his or her own resources. Much research is needed to understand the role of inhibitory control in the development of costly sharing and the consolidation of inequity aversion.     

Is service climate strength beneficial or detrimental for service quality delivery?

This study examines whether climate strength has a direct, moderating, or curvilinear effect in the relationship between service climate and customer service quality perceptions. To this end, we carried out cross-sectional and lagged empirical studies in the Spanish hospitality sector. Our cross-sectional results confirmed that high climate strength in managerial practices fosters a positive impact of managerial practices on customer service quality evaluations. However, other results related to customer orientation of services question the idea that service climate strength is always a precursor of service quality. High climate strength in customer orientation enhanced the negative relationship between customer orientation and functional service quality in a cross-sectional study, and between customer orientation and relational service quality in a lagged study. In addition, an examination of curvilinear effects of climate strength revealed an inverted U-shaped relationship between climate strength in customer orientation and relational service quality over time. The article concludes with a discussion of these results.     

Incremental Validity of Alexithymia, Emotional Coping and Humor Style on Happiness and Psychological Well-Being

This study attempts to ascertain whether alexithymia, suppression and reappraisal coping, and humor styles account for incremental variance in happiness (Lyubomirsky’s scale) and psychological well-being (Ryff’s scale), after controlling for Big Five traits and emotional positivity ratio of previous day’s mood. A total of 355 psychology undergraduates (72 % women) responded to measures of each construct, and two hierarchical multiple regressions were carried out for happiness and psychological well-being. The Big Five were entered in the first regression block, alexithymia was entered in a second block, and affiliative, self-enhancing, aggressive and self-defeating humor style, reappraisal and suppression coping were entered in the third block, and previous day’s mood in the last step. Alexithymia accounted for a small proportion of variance in psychological well-being, controlling for the Big Five traits. Suppression and affiliative, self-enhancing and self-defeating humor explained a complementary amount of variance in happiness and psychological well-being, controlling for the previous day’s mood, confirming the association of emotional regulation and affect with judgments of happiness and well-being. Taking into account humor and suppression, the multivariate association of alexithymia disappears. Results suggest that low suppression, low self-critical use of humor and affiliative humor are correlates of psychological well-being, whereas self-enhancing humor and low suppression are correlates of happiness, playing a mediational role between personality traits and well-being.