Control of Gait Initiation

The initiation of gait from a standing posture by 6 subjects, who took controlled-length steps, was analyzed. Using an inverted-pendulum model, we found that the duration of gait initiation was independent of gait velocity. This finding suggests that subjects' biomechanical constants are the determining factors for initiating movement. Both the instantaneous velocity of the center of gravity at the end of the first step (resulting in the propulsive forces measured on the ground) and the steady-state velocity (resulting in the step length and frequency) varied with step length, whereas step frequency did not. But step frequency and progression velocity were linked, for step frequency always increased in parallel with increased progression velocity. We interpret the correlation between velocity and frequency variations to be a peripheral expression of the posturodynamic control of the step parameters by the progression forces.     

A model of intervention at a psychoanalytic parent/child drop-in group in a poor district of Lima,Peru

The psychoanalytically informed work of a team of workers at a drop-in centre for families in a poor district of Lima is described. Interventions involve: accepting, connecting, playing and empowering. Clinical vignettes are used to illustrate the ways in which these interventions aim to help families. The acceptance of difficult feelings provides containment for attendees; acceptance of individuality fosters a greater capacity to mentalise. In viewing the patient as the relation between parents and child, connections are forged and encouraged between family members. Questions and difficulties that parents express are relayed to children in a palatable way, modelling the inclusion of children in the family dialogue. Playing is advocated and encouraged and elements of the fluid ‘frame’ impact on how playful interactions are shaped. Empowering takes place through encouraging reflexivity and dissolving fantasies of passivity. Questions about child behaviour are reflected back to the questioner or to other attendees, and pathologising diagnostic terms, if raised by families, are challenged and investigated, rather than accepted, encouraging families to carry on thinking. The implications of this model of work are discussed.     

Why read Fairbairn?

The author offers a close reading of portions of Fairbairn's work in which he not only explicates and clarifies Fairbairn's thinking, but generates ideas of his own by developing concepts that he believes to be implicit in, or logical extensions of, Fairbairn's work. Among the unstated or underdeveloped aspects of Fairbairn's contribution that the author discusses are (1) the idea that the formation of the internal object world is always, in part, a response to trauma (actual failure on the part of the mother to convey to her infant a sense that she loves him and accepts his love); (2) the notion that the infant's unceasing efforts to transform the internalized relationship with the unloving mother into a loving relationship – thus reversing the effect on his mother of his (imagined) 'toxic love'– is the single most important motivation sustaining the structure of the internal object world; and (3) the idea that attacks on oneself for the way one loves, while self-destructive, contain a glimmer of insight into one's own self-hatred and shame regarding one's endless, futile attempts to change oneself (or the rejecting object) into a different person. The author, using his own clinical work, illustrates the way he makes use of his understanding of the 'emotional life' of internal objects to facilitate the patient's emotional growth.     

Some thoughts on the concept of the internal parental couple

Some patients are incapable of engaging in a relationship with a partner on a long-term basis. To explain these relationship issues, they invoke reasons that have to do with external reality rather than with their own internal reality. The authors present several clinical examples that have given rise to an initial attempt at theorizing the concept of the internal couple: some patients fail to internalize a positive representation in which they can see themselves as part of a couple. Psychoanalysts tend to think of the father and mother (or their internal representatives) as separate entities, differentiated and complementary, and not in terms of a single object that brings them together as an internal couple. In the author’s view, an internal parental couple is also internalized by the infant under the guise of various internal objects. The internal parental couple thus appears as a complex construction that goes beyond the mere addition of father plus mother. Underneath their neurotic veneer, these patients have severely damaged representations of internal parents and of the internal parental couple. Unable to identify with a stable and procreative internal parental couple, they tend also to attack the psychoanalytic couple. Early distortions in the oedipal sphere may be one cause of the stumbling-block they encounter on the way to introjecting a well-attuned couple-as-object and the idea of parenting.     

The Stress Strategy Test in relation to personality traits and cognitive abilities

Federmann, R., Bäckström, M. & Goldsmith, R. (2010). The Stress Strategy Test in relation to personality traits and cognitive abilities. Scandinavian Journal of Psychology, 51 , 16–22.
Relations between results of the Stress Strategy Test (SST), a computerized test the first author developed partly involving the Stroop effect, and of an interview and an intelligence test used by the Swedish armed forces as selection instruments for placement of recruits in type of military service were investigated in a group of 3,205 recruits. The SST results were found able to explain 17.64% and 12.25% of the variance in results of the intelligence test and the interview, respectively. Emotional stability and psychological energy were the two interview variables most closely related to results of the SST. The usefulness of the SST in a selection context is discussed.     

医学书面语体的特征研究

以病历、医嘱、处方、检验报告、诊断学等教科书中书面语言为基础,对医学书面语体的内部结构和外部要素进行分析,认为医学书面语体作为一个相对新型的语体,在语词、句法、辞格和篇章等方面有显著的特征。还深入研究了这些特征与相关联的语言外部要素间联系。     

Differential attrition in health behaviour change trials: A systematic review and meta-analysis

Objective: Attrition is a common problem in health behaviour change (HBC) trials. When the degree of attrition differs between treatment conditions, then this is called differential attrition and is regarded as a major threat to internal validity. The primary research question of this study was: how often and to what degree does differential attrition occur in HBC trials?

Design: A systematic review and meta-analysis of a random selection of HBC trials (k = 60). We meta-analysed the relative attrition rates using a random-effects model and examined the relationship between the relative attrition rates and the potential moderators: the amount of human contact in delivery and the intensity of the intervention/control condition, the type of control condition, and the follow-up intensity and duration.

Main outcome measures: Relative attrition rates.

Results: The average attrition rate was 18% (SD = .15; M = .15) in the intervention and 17% (SD = .13; M = .13) in the control conditions. The estimated average relative attrition rate was 1.10 (95% CI: 1.01–1.20, p = .02), suggesting an overall higher attrition rate of 10% in the intervention conditions. This relative attrition rate was not related to any of the potential moderators.

Conclusion: There is indication of a slightly higher amount of attrition on average in the intervention conditions of HBC trials.     

Five Facets Mindfulness Questionnaire—Reliability and Factor Structure: A Swedish Version

Two studies were conducted to assess the Swedish version of the Five Facets Mindfulness Questionnaire (FFMQ), which was originally created by Baer et al. (2006). The aim of Study 1 was to examine the psychometric properties of the FFMQ using data from 495 individuals. Quantitative and qualitative analyses resulted in a reduction of the scale by 10 items. Psychometric properties, including internal consistency of the revised instrument, were examined. The Swedish FFMQ provides results comparable to those obtained by Baer. Cronbach's alphas were high for all the facets. The Swedish FFMQ appears to be a potentially useful tool in measuring mindfulness among Swedish participants. The aim of Study 2 was to test the suggested hierarchical five-factor solution and construct validity, using a confirmatory factor analysis (CFA). Similar to findings for the English version of the FFMQ, the CFA showed that the Observing facet was not a significant part of an overall self-reported mindfulness structure in a Swedish population with little meditation experience.     

Is the principle of minimization of secondary moments validated during various fingertip force production conditions?

During the application of fingertip forces with simultaneous flexion of the four fingers, namely index, middle, ring, and little fingers, a stable force sharing among fingers is adopted. Several studies have hypothesized that this stable force sharing is established to minimize unnecessary rotational moments (different from the main flexion moments). This principle labeled "minimization of secondary moments" is presented in the literature as a principle used by the central nervous system to solve musculoskeletal redundancy. However, this principle has only been tested with one solicited degree of freedom and in one finger posture. Our study tests this principle with various degrees of freedom solicited as secondary moments and in two different finger postures. Participants (n=6) were asked to apply a downward vertical force using their four fingers with the forearm placed in two different configurations: a "horizontal" condition (involving flexion/extension and pronation/supination at the wrist joint) and a "vertical" condition (involving flexion/extension and radial/ulnar deviation at the wrist joint). Additionally, two finger postures were tested in each forearm configuration: in the first, the distal inter-phalangeal joints (DIP) were extended and the proximal inter-phalangeal joints (PIP) highly flexed. In the second finger posture, both DIP and PIP joints were flexed. The resultant four-finger force and the relative involvement of each finger in the resultant four-finger force (force sharing) were analyzed. Results showed that the finger postures did not influence the finger force sharing, showing that the minimization of the secondary moment principle was stable among the finger joint angle configurations. Nonetheless, the relative involvement of each finger was dependent on the secondary degree of freedom solicited (pronation/supination vs. radial/ulnar). The modifications of the finger force sharing between the "horizontal" and "vertical" conditions were in accordance with the principle of minimization of the secondary moments.