Discordance in Recovery Between Altered Locomotion and Muscle Atrophy Induced by Simulated Microgravity in Rats

Exposure to a microgravity environment leads to adverse effects in motion and musculoskeletal properties. However, few studies have investigated the recovery of altered locomotion and muscle atrophy simultaneously. The authors investigated altered locomotion in rats submitted to simulated microgravity by hindlimb unloading for 2 weeks. Motion deficits were characterized by hyperextension of the knees and ankle joints and forward-shifted limb motion. Furthermore, these locomotor deficits did not revert to their original form after a 2-week recovery period, although muscle atrophy in the hindlimbs had recovered, implying discordance in recovery between altered locomotion and muscle atrophy, and that other factors such as neural drives might control behavioral adaptations to microgravity.     

Visual and Proprioceptive Adaptation of Arm Position in a Virtual Environment

The authors examined the resolution of a discrepancy between visual and proprioceptive estimates of arm position in 10 participants. The participants fixed their right shoulder at 0°, 30°, or 60° of transverse adduction while they viewed a video on a head-mounted display that showed their right arm extended in front of the trunk for 30 min. The perceived arm position more closely approached the seen arm position on the display as the difference between the actual and visually displayed arm positions increased. In the extreme case of a 90° discrepancy, the seen arm position on the display was very gradually perceived as approaching the actual arm position. The magnitude of changes in sensory estimates was larger for proprioception (20%) than for vision (< 10%).     

Adaptation in Visuomanual Tracking Depends on Intact Proprioception

The role of arm proprioception in motor learning was investigated in experiments in which, by moving the arm, subjects followed the motion of a target displayed on a monitor screen. Adaptive capabilities were tested in visuomanual tracking tasks following alterations in the relationship between the observer's actual arm movement and visual feedback of the arm movement given by a cursor motion on the screen. Tracking performance and adaptive changes, measured in terms of spatiotemporal error, tracking trajectory curvature, and spatial gain, were compared in 7 control subjects (CSs) and in 1 deafferented subject (DS). CSs adapted appropriately to altered visuomanual relationships; those changes were present in trials immediately after restoration of normal scaling. In contrast, although the DS modified his tracking strategy from trial to trial according to the altered conditions, he did not show plastic changes in internal visuomanual scaling. Like the results of prismatic adaptation experiments, the present results suggest that arm proprioception contributes to the plastic changes that follow alterations in the scaling of visuomanual gain.     

Locus of Control and Hostility: Sex Differences

The Nowicki-Strickland Internal-External locus of control scale and the Hostility and Direction of Hostility Questionnaire were administered to 35 male and 35 female college students. In both the total sample and the female sample, significant correlations were observed between locus of control and hostility with an external locus of control being associated with greater hostility. Although locus of control was significantly related to all of the hostility scores in the female sample, the male sample generally showed no significant relationship between locus of control and hostility. The sex differences in the data and the possibility of item overlap between the locus of control and hostility measures are discussed.     

Acculturation,Adaptation and Saudade Among Portuguese Migrants

Saudade is a psychological reaction to the absence of significant others and familiar places. This investigation examined differences in saudade in a sample of 227 Portuguese adults without migratory experience, and 202 Portuguese migrants living in Switzerland. Within the migrant group, the relation between saudade and acculturation and adaptation factors was also examined. Results indicate that migrants experienced higher levels of saudade than did non-migrants. Length of residence abroad influenced the level of saudade: the longer the time spent abroad the less saudade was felt. Acculturation and adaptation factors accounted for 44% of the explained variance in saudade. Among acculturation factors, higher Portuguese proficiency and separation, and lower assimilation predicted more saudade. Among the adaptation factors, higher sociocultural adaptation problems and lower migration satisfaction also predicted higher saudade. It is hoped that investigation on saudade continues, and suggestions are made for further research.     

Brief Sensation Seeking Scale for Chinese – Cultural adaptation and psychometric assessment

International behavioral research requires instruments that are not culturally-biased to assess sensation seeking. In this study we described a culturally adapted version of the Brief Sensation Seeking Scale for Chinese (BSSS-C) and its psychometric characteristics. The adapted scale was assessed using an adult sample (n = 238) with diverse educational and residential backgrounds. The BSSS-C (Cronbach alpha = 0.90) was correlated with the original Brief Sensation Seeking Scale (r = 0.85, p < 0.01) and fitted the four-factor model well (CFI = 0.98, SRMR = 0.03). The scale scores significantly predicted intention to and actual engagement in a number of health risk behaviors, including alcohol consumption, cigarette smoking, and sexual risk behaviors. In conclusion, the BSSS-C has adequate reliability and validity, supporting its utility in China and potential in other developing countries.     

Resistance to a dynamic world view

The fact that people think is taken for granted. How we go about the thinking process is seldom reflected upon by the individual. In order to be able to grasp complex phenomena, and changing and interdependent relationships students participating in a systems course are required to become aware of their way of performing the thinking process. In discussions with them and based on ‘soft analysis’ it seems that there is resistance to a dynamic, multilevelled thinking process due to habits acquired at school, or perhaps even at an earlier age. The personality structure, and a coherent experience of a complete ‘self’ seems to enhance mental mobility, and the possibility of developing a dynamic world view.     

Internet pornography and paedophilia

Various indices of use of Internet pornography have drawn attention to the extent of adult sexual interest in children; clinical experience and now research evidence are accumulating to suggest that the Internet is not simply drawing attention to those with existing paedophilic interests, but is contributing to the crystallisation of those interests in people with no explicit prior sexual interest in children. Drawing on clinical experience in a specialist NHS outpatient psychotherapy service, the author argues that a dichotomous notion of paedophilia is no longer tenable, and any model of paedophilia needs to take account of eruptions of a sexual interest in children in those who appear not to be consistently paedophilic and who have had adult-to-adult sexual relationships. This phenomenon is analysed in two ways: first, by considering how it is that the adult sexual adaptation might ‘unravel’ under the influence of Internet sex to reveal underlying paedophilic currents and second, by revisiting general and psychoanalytic theories of paedophilia and by considering how predisposing factors to paedophilia might be amplified through access to Internet pornography.     

Motivational and cognitive determinants of control during conflict processing

Previous studies suggest that both reward anticipation and expected or experienced conflicts activate cognitive control. The present study investigated how these factors interact during conflict processing. In two experiments, participants performed a variant of the Stroop task, receiving performance-dependent monetary rewards in some blocks. In addition, we manipulated the level of conflict-triggered reactive and expectancy-driven proactive control: In Experiment 1, we compared the Stroop effect after previously congruent and incongruent trials to examine the conflict adaptation effect (reactive control). We found that the level of motivation did not interact with conflict adaptation. In Experiment 2, we varied the proportion of congruent and incongruent trials to manipulate conflict expectancy (proactive control). The data suggest the effects of motivation to be less pronounced under conditions of high conflict expectancy. We conclude that the interaction of motivation with cognitive determinants of control depends on whether these activate proactive or reactive control processes.