Attention Demands in Balance Recovery following Lower Limb Amputation

The attention demands in balance control after damage to the peripheral sensorimotor system were studied in 12 persons with a recent lower limb amputation. The interference of an arithmetic task with two postural tasks of different complexity (quiet standing and active weight shifting) was examined several times during their rehabilitation while the subjects stood on a force platform. Control data were obtained from healthy subjects. For both postural tasks, persons with amputation performed worse than controls. Quiet standing, a relatively simple task, revealed clear dual-task interference only in the amputation group. Evidence was found for a reduction in dual-task interference as rehabilitation progressed. In contrast, voluntary (feedback-controlled) weight shifting, a more complex task, revealed an equal amount of dual-task interference in persons with amputation and in controls, without changes in interference over the period of rehabilitation. The results indicate that attentional mechanisms may be involved in postural control, depending on both the novelty and complexity of the task. Moreover, a reduction in attention demands of quiet standing may reflect a central adaptation of the postural organization to the peripheral sensorimotor impairments caused by lower limb amputation.     

The Functional Role of Cognitive Frameworks on Visuomotor Adaptation Performance

The authors investigated the effects of cognitive representations of movement directions on sensorimotor adaptation performance. Adaptation performance was measured via a pointing experiment in which participants were provided with visual feedback that was distorted along the midsagittal plane (i.e., left-right reversal). Performance was analyzed relative to participants’ individual adaptation gains and 3 groups were subsequently defined (i.e., skilled, average, and poor adapters). The group separation was kept for the Cognitive Measurement of Represented Directions, which was used to analyze participants’ cognitive representation of movement directions. The results showed that skilled adapters, in contrast to poor adapters, possess a global representation of movement directions aligned to the cardinal axes. The cognitive representation structure hence supports the sensorimotor adaptation performance.     

Unconscious Semantic Priming Influences Performance of Visuomotor Tasks Differently but the Effects are Similar in Young and Older Adults

We examined the effects of semantic priming of attention on two sequentially presented visuomotor tasks, traffic judgments and saccadic adaptation. Priming was accomplished with the scrambled sentence task: participants formed meaningful sentences from a list of words where a word denoting wide attention focus was involved. The results showed that semantic priming influenced positively saccade adaptation (its’ benefit increased) while it attenuated visuomotor performance in the traffic task (RT of hand movements increased). We found the effects of priming on both tasks’ performance to be comparable in young and older participants. It was suggested that semantic priming effect on visuomotor tasks depended on the cognitive resources which were needful as for the priming as for the primed task.     

Estimating Gait Stability: Asymmetrical Loading Effects Measured Using Margin of Stability and Local Dynamic Stability

Changes to intersegmental locomotor control patterns may affect body stability. Our study aimed to (a) characterize upper body dynamic stability in response to the unilateral addition of mass to the lower extremity and (b) evaluate the efficacy of 2 different stability measures commonly used in the literature to detect resulting symmetrical step pattern modifications across the weighted segments (spatial) and between epochs of the gait cycle (temporal). Young adults walked on a treadmill while unloaded or with weights applied unilaterally to their foot, shank, or thigh. Both margin of stability and local dynamic stability (LDS) estimates detected similar trends of distal segment weighting resulting in more unstable upper body movement compared to proximal weighting; however only LDS detected anteroposterior changes in upper body stability over time.     

Ipsilateral Loudness Adaptation Over Multiple Intensity Levels

Three mirror tracing experiments were conducted to investigate the connection between perception and motor behavior. In the first experiment, some subjects traced a hex-maze, other subjects traced a hex-maze after observing a model trace, others traced a hex-maze after reading instructions on mirror images, and others traced a hex-maze after having observed a model and heard the instructions. There were no significant differences between the groups' error scores, but their time scores differed significantly, although not always in the predicted direction. In Experiment 2, the subjects were to trace selected letters of the alphabet. Error scores for the second experiment did not differ much from those for the first experiment. In Experiment 3, the experimenter gave each subject commands for the correct directions of movement, using the subject's body as a frame of reference. There was little improvement in motor performance. These results suggest that the visual information presented in the mirror captured the subjects' attention and blocked their motor tracing program.     

The recognized benefits of negative thinking/affect in depression and anxiety: Developing a scale

Negative thinking/affect (NTA) in depression and anxiety is an important target of clinical intervention. However, individuals recognize the benefit of NTA. There is a need to develop a scale for empirical studies of NTA. Two‐hundred and fifty‐nine Japanese university students were assigned to answer: (a) the state in the past week (positive affect (PA) and Center for Epidemiologic Studies Depression Scale), (b) the current state (PA and State‐Trait Anxiety Inventory‐State (STAI‐S)), and (c) the usual state (PA and STAI‐Trait), after completing the Recognized Benefit of NTA Scale (RBNTA). Another 291 students completed the Rosenberg Self‐Esteem Scale and the Revised Life Orientation Test, after completing the RBNTA. Two weeks later, 76 participants completed the RBNTA. The RBNTA with nine subscales was developed after comparing the indices of fitness from 14 different factor solutions. The internal and test‐retest reliability and content validity were confirmed. Correlation analyses revealed that the recognition of trying to obtain benefits/avoid costs tends to associate with positive/negative affect and that most of such recognitions did not associate with self‐esteem and optimism.     

Choosing the Appropriate Design and Analysis of a Research Project

It is extremely important that the proper mental planning of a research project is considered before the data collection ever begins. Otherwise, problems may be encountered after the data have been collected and it may then be too late to correct them. This paper will explain some of the important considerations necessary in choosing an adequate design and analysis for a research project.     

Attachment dimensions in adolescence: an adaptation of the Inventory of Parent and Peer Attachment (IPPA) into Basque / Dimensiones del apego en la adolescencia: adaptación al euskera del Inventario de Apego de Progenitores y Pares (IPPA)

Abstract

The aim of this study was to develop a short Basque version of the Inventory of Parent and Peer Attachment (IPPA), as well as to test its factor structure and analyse other psychometric properties. Two studies were carried out. In the first study a confirmatory factor analysis conducted on a sample of 1037 adolescents did not show an optimal model fit of the three-dimensional structure of the original instrument. A subsequent analysis of principal components revealed a one-dimensional structure. The analysis of items led to the elaboration of short forms. In the second study, carried out on another sample of 2129 adolescents, the one-dimensional structure was confirmed, further external validity evidence was provided, and good reliability indices were obtained. A single dimension is concluded, attachment security, as well as the validity and reliability of the short forms of the IPPA in Basque scales.     

Evolution,green beards,and skin hue wage discrimination

This paper provides an evolutionary rationale for both interracial and intraracial wage differentials by examining the implications of white employers mediating their employer‐employee relationships on the basis of genetic similarity. If in organized labor markets; relationships mediated through genetic similarity are optimal in terms of Darwinian fitness, a fundamental evolutionary implication is that the Marginal Rate of Substitution (MRS) in Darwinian fitness holding extended fitness constant equals the MRS in preferences holding utility constant. Given such an evolutionary equilibrium, results are derived showing that the strength of tastes for discrimination depends upon the skin hue of non‐white workers. The rationale established for racial wage differentials is that where skin hue serves to indicate genetic similarity between employer and employee, wage differentials emerge that are a function of skin hue.     

Feeling like a good psychotherapist — Or a bad one: Critical incidents in psychotherapists' experiences

What makes a therapist feel competent or incompetent in a session, a concept related to the good — or bad — hour, is an implication of what the therapist believes is good therapy and therefore is trying to do — or believes is bad and therefore tries to avoid doing. In an attempt to infer covert processes in therapists, twenty-seven psychoanalytically-oriented psychotherapists furnished written accounts of sessions when they had felt like good — or bad — therapists. Accounts were analysed and interpreted to uncover the varieties of good and bad experiences and their grounds. Resistance and countertransference were found to be critical phenomena. When the therapist was able to cope with such complications, good feelings were generated, and when he was unable, bad ones — provided he became aware of this inability. If not, the therapist acted out patient-specific or unspecific countertransference feelings in ways that made him feel like a good therapist.