Affective touch modulates the rubber hand illusion

Introduction

Humans experience touch as pleasant when this occurs with a certain velocity (1–10cm/s). Affective, pleasant touch is thought to be mediated by a distinct neural pathway consisting of un-myelinated tactile afferents (C tactile fibers) that respond to stroking with a low velocity on the hairy skin. As pleasant touch provides additional information on bodily signals we hypothesized that, compared to regular touch, pleasant touch would have a stronger effect on body ownership as measured through induction of the rubber hand illusion (RHI).

Methods

Two experiments involving the RHI were conducted. In the first experiment, the effects of stroking velocity (3 cm/s and 30 cm/s) and stroking material (soft/rough) on the RHI were tested. In the second experiment, the effect of an additional stroking velocity (0.3 cm/s) and side of stimulation (hairy and glabrous) was examined.

Results

The first experiment showed that low velocity stroking in combination with a soft material was not only regarded as most pleasant but also resulted in an enhanced RHI on proprioceptive drift and temperature measurements. In the second experiment, we confirmed that stroking with a velocity of 3 cm/s resulted in a larger RHI in terms of proprioceptive drift. In addition, compared to regular touch, pleasant touch of the hairy skin resulted in a larger proprioceptive drift, while similar stroking on the glabrous side of the skin did not induce a stronger effect of RHI on proprioceptive drift.

Conclusion

Our data suggest that pleasant touch modulates the body representation which is consistently reflected in a larger proprioceptive drift. Our data also suggest that C tactile fibers are likely to be involved in the modulation of body ownership.     

Personality correlates of risky health outcomes: Findings from a large Internet study

Numerous studies have documented the effects of personality on health outcomes. However, which traits are most relevant to health, and the precise magnitude of their effects, is inconsistent across studies. The present study used a large sample (N = 460,172) to replicate and extend the relations between the Big Five and three health-related outcomes: self-reported health, body mass index, and substance use. Low Conscientiousness predicted all outcomes, indicating that individuals who are less responsible and less self-controlled tend to report poorer health, be more overweight, and engage in more substance use. Individuals who were more emotionally unstable (high Neuroticism) reported poorer health, and individuals prone to seek out social experiences and rewards (high Extraversion) engaged in more frequent substance use.     

Interpersonal choice: The advantage on the left or on the right?

This study explored whether body specificity unconsciously influenced preferences for certain people. Participants were presented pictures of the heads of 2 persons who were described as having the similar personality, profession and family background. They were instructed to choose 1 in each pair as the preferred date, preferred friend, more charismatic boss or as the better national leader. The results showed body specificity had an influence on the selection preference on first impression. Participants tended to choose the character on their dominant‐hand side. This study not only provided the first social psychological evidence for the body‐specificity hypothesis, but also first demonstrated a role for body specificity in impression formation and selection preference.     

Muscle Dysmorphia Research Neglects DSM-5 Diagnostic Criteria

This systematic review aimed to collect, evaluate, and synthesize the research on muscle dysmorphia (MD) post official recognition as a specifier for body dysmorphic disorder (BDD) in the DSM-5, and provide recommendations for future research. Literature searches were conducted in four databases to see if inclusion criteria were met. Results revealed 33 studies meeting inclusion criteria, none of which utilized DSM-5 criteria for MD or acknowledged the criterion in their research. Few studies acknowledged the association between MD and BDD, and the methodological quality of recent MD research was considered low due to a lack of clinical samples, measurements not using validated cutoff scores, and the research designs. In conclusion, future MD research is encouraged to utilize DSM-5 diagnostic criteria to better inform clinical practice and significantly improve the methodological quality. As such, more effective treatment options may be developed, reducing the risk of health-harming consequences in these individuals.     

Body image and disordered eating prevention in girls’ sport: A partner-driven and stakeholder-informed scoping review of interventions

Despite the evidenced benefits of participating in organized sport, adolescent girls consistently report lower rates of sport participation, worse sport experiences, and higher dropout rates, compared to boys. Body image concerns have been linked to this gender disparity and established as a critical predictor of disordered eating, thus necessitating effective prevention efforts to mitigate the negative impacts of body image concerns and disordered eating for adolescent girls. In partnership with the National Eating Disorder Information Centre (NEDIC; Canada), the present scoping review was conducted to examine the nature and characteristics of sport-specific body image and disordered eating interventions for adolescent girls. Fourteen studies were identified through various search strategies. Over half of the studies demonstrated modest yet worthwhile effects on various body image and disordered eating outcomes. Intervention characteristics (i.e., frequency, modes of delivery, topics, material, outcomes measured) varied across initiatives. Fifty-nine national, provincial, and local sport system representatives were consulted as stakeholders and provided practical input to the results of the scoping review. Sport stakeholders favoured the delivery of a multidimensional, multicomponent program, with a combination of evidence-based techniques. This synthesis of knowledge will shape the development and dissemination of future programs, and contribute to the development of equitable sport participation opportunities for Canadian girls.     

Necessary condition for forward progression in ballistic walking

Ballistic walking requires an appropriate configuration of posture and velocity at toe-off to avoid backward falling. In this study, we investigated a determinant of the state of the body center of mass (COM) at the toe-off with regard to ballistic walking. We used an inverted pendulum model to represent ballistic trajectories and the necessary condition for forward progression by a simple relationship between the COM states (position and velocity) at toe-off. This condition was validated through a computer simulation of a 7-link musculoskeletal model and measurement experiments of human movements involving stepping and walking. The results of the model simulation were in good agreement with some of the results predicted by the inverted pendulum model. The measurement experiments of walking and stepping movements showed that most COM states at toe-off satisfied the condition for forward progression and the measured trajectories during single support phase were similar to the ballistic trajectories although humans are capable of walking in non-ballistic ways. These results suggested that the necessary condition for forward progression can predict the COM states at toe-off for efficient movement and for avoiding backward falling during single support phase.     

The origin and mission of Material Religion

Beginning its sixth year of publication, Material Religion is an interdisciplinary journal that seeks to gather the best work from around the world engaged in materializing the study of religions. The editors welcome original scholarship on any religion and from any period in human history that treats material objects and practices as primary evidence and engages in critical reflection on the cultural construction of materiality. In this article the editors reflect on the formation and format of the journal, the force and direction of its articles and other features, the question of what constitutes the material culture of religion, and finally the role of materiality in the current study of religions. Along the way, the editors consider new theories and concerns that have been taken up in the journal's pages and address the range of disciplines and interests that are represented in the different departments of the journal.     

Anxiety and hypervigilance to cardiopulmonary sensations in non-cardiac chest pain patients with and without psychiatric disorders

We investigated body vigilance, cardiac anxiety, and the mediating role of interoceptive fear on pain in patients with non-cardiac chest pain (NCCP; a syndrome of chest pain in the absence of identifiable organic etiology). Patients were more attentive to cardiac-congruent sensations than cardiac-incongruent sensations (e.g., gastrointestinal, cognitive dyscontrol; p's < .001). Patients with a DSM-IV Axis I anxiety or mood disorder were more body vigilant compared to patients who did not have a disorder (p's < .05). Patients with anxiety disorders were particularly vigilant to and fearful of cardiac sensations relative to patients without anxiety disorders. Latent variable path models examined the extent that interoceptive fear mediated the association between body vigilance and cardiac anxiety on chest pain. Within each model, diagnostic status, body vigilance, and cardiac anxiety were exogenous and predicted interoceptive fear that in turn predicted pain. Separate models examined body vigilance and cardiac anxiety, and both models fit the data well. Findings showed partial mediation for the body vigilance factor, and full mediation for the cardiac anxiety factor. Interoceptive fear played a mediating role in both models. The syndrome of NCCP may persist partly due to conscious hypervigilance to and fear of cardiac-congruent body sensations, particularly among anxious patients.     

图式化程度对解决代数文字题的影响

本研究探讨了图式化程度即例子的概括化程度对解决代数文字题的影响。结果表明 :(1 )例子的表层类似性与目标问题具有一种格式塔的同型效应 ,容易解决“属性”一一对应的问题。 (2 )由例子表层类似性构成的图式化程度低 ,迁移的范围比较窄 ;由例子结构类似性构成的图式化程度高 ,适用的范围比较宽。 (3 )尽管增加了例子与目标问题的难度 ,由结构类似性形成的代数图式仍然可以比较容易地解决目标问题     

Revisiting the Factor Structure of the Agoraphobic Cognitions Questionnaire and Body Sensations Questionnaire: A Confirmatory Factor Analysis Study

The twin scales, Agoraphobic Cognitions Questionnaire and Body Sensations Questionnaire (D. L. Chambless, G. C. Caputo, P. Bright, & R. Gallagher, 1984), have been used frequently in the area of anxiety, and in particular, panic disorder with agoraphobia. The present study employed confirmatory factor analysis to investigate the factor structure of the scales in a sample of Australian patients with anxiety disorder. Model testing indicated that neither the original nor the modified factor structures offered a good fit to the data. In addition, confirmatory factor analyses highlighted statistical inconsistencies in the scales. Except for a few, most of the items were problematic. This indicated a need for possible revision of the scales. Moreover, until further research is conducted, researchers and clinicians are recommended to use the scales with caution.