Quadriceps Torque,Peak Variability and Strength Endurance in Patients after Anterior Cruciate Ligament Reconstruction: Impact of Local Muscle Fatigue

Abstract

We tested if ACL-reconstructed participants show a decreased quadriceps torque, a lower muscle endurance capacity and a higher peak torque variability compared to unimpaired control participants prior to and following local muscle fatigue. Participants (n?=?19, 10 women; 25?±?5yrs.) with unilateral hamstrings autograft ACL-reconstruction and a matched unimpaired control group were recruited. Participants performed two maximal isometric voluntary force (MIVF) contractions of the knee extensors. In between, standardized local muscle fatigue was induced. ACL-reconstructed knees display a lower peak torque of the knee extensors in comparison to the contralateral limb (3.2?±?.3Nm/kg vs. 3.5?±?.3 Nm/kg). Peak torque variability and fatigue resistance were not affected by local muscle fatigue (p > .05). Participants with ACL-reconstructed knees show a persistent quadriceps muscle dysfunction. This dysfunction and lower limb side asymmetries might be risk factors for ACL re-ruptures.     

A Psychoneurotic Inventory of Penitentiary Inmates

ABSTRACT

Identity fusion theory suggests that merging groups into one’s personal identity should result in heightened levels of group agency. Research on the self-expansion model complementarily indicates that including others into the self is linked to a greater feeling of self-efficacy. Across three correlational studies, we examined whether personal and group identity fusion is associated with stronger feelings of personal agency, and we propose that relatively stable feelings of clarity of self-concept would mediate this association. Individuals strongly fused with a country (Studies 1–3) and family (Study 2) exhibited greater feelings of agency and goal-adherence, and self-concept clarity emerged as a significant mediator of this association when controlling for group identification measures.     

Public Self-Presentations and Self-Conceptions: The Moderating Role of Identity Status

Abstract

The effect of level of identity status on the internalization of a public self-presentation was investigated. American late adolescents, pretested on identity status and sociability, were instructed to portray themselves positively or negatively during a face-to-face interview, in a written interview, or on an anonymous questionnaire. Participants internalized positive presentations and resisted internalizing negative ones. Regression analyses indicated that differences in identity-status scores moderated shifts in private self-appraisals. Increased susceptibility was associated with moratorium scores, but only in the negative role conditions. Foreclosure scores accounted for enhanced resistance, but only in the positive role conditions. Evidence for the moderating effect of identity diffusion was obtained only in actual face-to-face encounters.     

Corralling the Ingroup: Deviant Derogation and Perception of Group Variability

ABSTRACT

Two experiments investigated the relationship between the evaluation of a deviant group member and the perceived group variability among participants with varying degrees of ingroup identification. In Experiment 1 (N?=?79) ingroup identification was negatively associated with perceived ingroup variability following the presentation of a deviant ingroup member. This relationship was mediated by ratings of the deviant: the stronger the identification, the more negatively the deviant was evaluated, and the more homogeneous the ingroup was perceived. These effects were replicated in Experiment 2 (N?=?169), which also showed that there was no association between ingroup identification and the representation of the outgroup following exposure to a deviant outgroup member. The findings suggest that deviant derogation may serve to isolate undesirable members from the rest of the ingroup and protect the group's identity.     

Evaluation of a Combined Cognitive Behavioural Therapy and Interpersonal Process Group in the Psychotherapy Training of Clinical Psychologists

It is now widely acknowledged that both content and process elements of psychotherapy play a part in client treatment outcomes. Despite this, there are pressures on Australian clinical psychology training programs to teach evidence‐based approaches in a relatively short time frame. Producing clinical psychology graduates who have an adequate level of competence in evidence‐based practice and meeting the demands of professional accreditation requirements can mean that less time is available to teach the process elements of psychotherapy. The aim of this study was to conduct a preliminary evaluation of a clinical psychology psychotherapy training program that combines an interpersonal process group with a cognitive behavioural therapy training model that incorporates self‐reflection and self‐practice. Eleven participants who participated in the training in 2008 completed the Counseling Self‐Estimate Inventory at pre‐ and post‐training. Significant improvements on the majority of the subscales of this inventory were found. A separate sample of nine trainees and clinical psychology registrars who also previously completed the program attended individual interviews in 2010 aimed at gaining their perspective regarding various aspects of the program. Self‐practice of cognitive behavioural therapy techniques was found to be important in the identification and management of trainees’ own core beliefs, and to their appreciation of how challenging this process may be for clients. The interpersonal process group was described by participants as enhancing their competency as psychotherapists. Common themes included the experience of anxiety and a high level of emotion, and understanding how this experience might be similar for clients; increased self‐awareness; and increased competence in process issues. Many participants believed the process and content components of training were equally important to their development as psychotherapists.     

Intentions to participate in counselling among front-line,at-risk Irish government employees: an application of the theory of planned behaviour

ABSTRACT

The study set out to examine intentions to engage in counselling among at-risk Irish government employees and the differential utility of two alternative theory of planned behaviour (TPB) models of behaviour to explain intentions to participate in counselling. Individuals (N=259) employed in a front-line, at-risk occupation for the Irish government completed a TPB-based questionnaire. Quantitative analyses revealed that participants held positive to neutral intentions to participate in counselling, irrespective of gender. The original TPB model explained 49.9% of variance in intentions whereas an alternative TPB model, splitting the perceived behavioural control (PBC) construct between its internal and external control components, explained a further 8.9% of variance. Furthermore, self-efficacy was found to be the strongest predictor of intentions. This study therefore supports the use of the TPB in understanding counselling-seeking behaviour.     

Increasing perceived variability reduces prejudice and discrimination

We examined whether increasing individuals' perceived variability of an out-group reduces prejudice and discrimination toward its members. In a series of 4 laboratory and field experiments, we attracted participants' attention to either the homogeneity or the heterogeneity of members of an out-group, and then measured their attitudes or behaviors. Perceived variability was manipulated by making subgroups salient, by portraying the out-group members as having diverse opinions, by making salient that out-group members have different characteristics, or by asking participants to think about differences among out-group members. Prejudice and discrimination were measured in terms of self-reported attitudes, distribution of rewards, helping an out-group confederate, and evaluation of an out-group candidate in a simulated hiring decision. In all experiments, perceived variability decreased prejudice and discrimination. This effect may be due to the fact that perceived variability decreases the role of group membership in the production of attitudes and behaviors toward other individuals.     

Reinforcing saccadic amplitude variability

Saccadic endpoint variability is often viewed as the outcome of neural noise occurring during sensorimotor processing. However, part of this variability might result from operant learning. We tested this hypothesis by reinforcing dispersions of saccadic amplitude distributions, while maintaining constant their medians. In a first experiment we reinforced the least frequent saccadic amplitudes to increase variability, and then reinforced the central part of the amplitude distributions to reduce variability. The target was placed at a constant distance from the fovea after the saccade to maintain the postsaccadic visual signal constant and an auditory reinforcement was delivered depending on saccadic amplitude. The second experiment tested the effects of the contingency. We reinforced high levels of variability in 4 participants, whereas 4 other participants were assigned to a yoked control group. On average, saccadic amplitude standard deviations were doubled while the medians remained mostly unchanged in the experimental participants in both experiments, and variability returned to baseline level when low variability was reinforced. In the control group no consistent changes in amplitude distributions were observed. These results, showing that variability can be reinforced, challenge the idea of a stochastic neural noise. We instead propose that selection processes constrain saccadic amplitude distributions.     

Individuals differ in the attentional blink: Mental speed and intra-subject stability matter

The failure to correctly report two targets (“T₁”, “T₂”) that follow each other in close temporal proximity has been called the “attentional blink” (AB). The AB has, so far, mainly been studied using experimental approaches. The present studies investigated individual differences in AB performance, revealing (among further findings) a high positive correlation between the accuracies of detecting the two targets correctly (r = 0.69); and between T₂∣T₁ accuracy and psychometric intelligence (0.41 ≤ r ≤ 0.43) and RT variability in short-term and working memory (− 0.38 ≤ r ≤ − 0.45). Together, these results support important aspects of major theoretical accounts of the AB from an individual differences perspective and introduce intelligence and intra-subject stability as contributing factors in AB performance.     

The democratic therapeutic and training communities of the Open Psychotherapy Centre: A multifactorial communal approach

This paper describes the structure, function and effectiveness of a multifactorial communal approach which is applied in the therapy department and the four training institutes of the Open Psychotherapy Centre in Athens. The therapeutic philosophy of this approach is based on the principles of group analysis, therapeutic community and emprosopon psychotherapy which are applied in combination with each other.