The link between motor impairment level and motor imagery ability in children with developmental coordination disorder

The present study examined motor imagery ability in children with developmental coordination disorder (DCD). Specifically, it explored whether children with varying degrees of motor impairment differed in their ability to perform motor imagery tasks. Fourty-two children scoring below the 15th percentile on the Movement ABC were split into two groups--DCD severe (DCD-S), scoring on or below the 5th percentile, and DCD mild (DCD-M), scoring from the 6th to 15th percentiles--and compared to 21 age matched controls. Participants performed two motor imagery tasks--hand (performed without and with specific imagery instructions) and whole-body rotation. The results demonstrated that children in the DCD-S group had a generalized motor imagery deficit in that they were less accurate across tasks than controls (and the DCD-M group on the hand task) and showed little benefit when given specific imagery instructions. The DCD-M group appeared capable of performing simpler motor imagery transformations, but were less successful as task complexity increased. Unlike the DCD-S group, the DCD-M group did show some benefit from specific imagery instructions with increases in accuracy on the hand task. These results suggest that a motor imagery deficit does exist in many children with DCD but that its presentation can vary--factors such as the individual child's level of motor impairment and task complexity appear to be linked to the profile of deficits observed, which could explain the inconsistent findings of previous studies. Although this study lends support to the theory that a deficit in internal modeling is an underlying problem for children with DCD, still more research is required to develop the theory further.     

Parent–child interactions and relational aggression in peer relationships

The major aim of this review is to propose new ways of thinking about the role of parents in the development and course of children’s relationally aggressive behavior. An important theoretical framework from which to start thinking about linkages between parenting and relational aggression is provided by attachment theory. Attachment theory proposes that early family experiences are an important basis for the development of later peer relationships. Recent studies are only beginning to suggest possible linkages between children’s parental attachment and relational aggression. One possible reason for the scant research is that theoreticians studying these constructs have not yet developed a conceptual framework combining the two, but rather have focused on different characteristics of different interpersonal contexts. Based on the premise that both relational aggression and attachment are relational constructs and given the already established correlations between insecure attachment and physical aggression, this paper will attempt to devise a heuristic model that may serve as an aid to discover links between parent–child interactions, attachment, and relational aggression. Finally, implications for future studies of relational aggression are discussed.     

Differential endophenotypic markers of narcissistic and antisocial personality features: A psychophysiological investigation

This study investigated the differential psychophysiological correlates of narcissistic and antisocial personality features in a college student sample. Skin conductance (SC), respiratory sinus arrhythmia (RSA), and pre-ejection period (PEP) were monitored while participants watched a countdown to an aversive noise blast and viewed emotionally valenced slides. Results indicated that narcissistic personality features were unrelated to SC reactivity during the countdown, whereas antisocial personality features were negatively related to SC reactivity. Narcissistic personality features were also related to RSA decreases and PEP shortening while viewing happy slides, whereas antisocial personality features were not. Taken together, these findings suggest differential endophenotypic markers of narcissistic and antisocial personality features despite their clinical similarities.     

Genetic effects on male sexual coercion

The genetic and environmental influences on sexual coercion, and to what extent its associations with alcohol use and psychopathy depend on shared genetic and environmental effects, were explored in a Finnish population-based sample of 938 men, aged 33-43 years, using the classical twin study design. All three phenotypes were associated positively and affected by genes (sexual coercion 28%, alcohol use 60%, psychopathy 54%), with 46% of the correlation between sexual coercion and psychopathy, 89% of the correlation between alcohol use and psychopathy and 100% of the correlation between sexual coercion and alcohol use being explained by shared genetic effects. Further, the results showed that a proportion of the variance in sexual coercion was derived from a highly genetic source that was common with alcohol use and psychopathy. This latent factor was hypothesized to reflect a general tendency for antisocial behavior that is pervasive across different situations. Relevant theories on sexual coercion were discussed in light of the results.     

The good and bad of relationships: how social hindrance and social support affect relationship feelings in daily life

The authors examined the effects of social hindrance and support on negative and positive relationship-specific feelings in three daily diary studies. Study 1 showed that hindrance and support independently predicted positive relationship feelings, but only hindrance predicted negative feelings. Study 2 used new measures of hindrance and support and showed that hindrance and support independently predicted same-day relationship feelings but that the effects of hindrance were stronger in magnitude. Study 3 yielded similar findings using the new measures of hindrance and support and controlling for morning feeling. These asymmetrical crossover effects suggest that bad is only stronger than good when it comes to bad outcomes; they also support the distinction between aversive and appetitive relational processes.     

How do we know what we are doing? Time, intention and awareness of action

Time is a fundamental dimension of consciousness. Many studies of the "sense of agency" have investigated whether we attribute actions to ourselves based on a conscious experience of intention occurring prior to action, or based on a reconstruction after the action itself has occurred. Here, we ask the same question about a lower level aspect of action experience, namely awareness of the detailed spatial form of a simple movement. Subjects reached for a target, which unpredictably jumped to the side on some trials. Participants (1) expressed their expectancy of a target shift during the upcoming movement, (2) pointed at the target as quickly and accurately as possible before returning to the start posiment to the target shift if required and (3) reproduced the spatial path of the movement they had just made, as accurately as possible, to give an indication of their awareness of the pointing movement. We analysed the spatial disparity between the initial and the reproduced movements on those with a target shift. A negative disparity value, or undershoot, suggests that motor awareness merely reflects a sluggish record of coordinated motor performance, while a positive value, or overshoot, suggests that participants' intention to point to the shifting target contributes more to their awareness of action than their actual pointing movement. Undershoot and overshoot thus measure the reconstructive (motoric) and the preconstuctive (intentional) aspects of action awareness, respectively. We found that trials on which subjects strongly expected a target shift showed greater overshoot and less undershoot than trials with lower expectancy. Conscious expectancy therefore strongly influences the experience of the detailed motor parameters of our actions. Further, a delay inserted either between the expectancy judgement and the pointing movement, or between the pointing movement and the reproduction of the movement, had no effect on visuomotor adjustment but strongly influenced action awareness. Delays during either interval boosted undershoots, suggesting increased reliance on a time-limited sensory memory for action. The experience of action is thus strongly influenced by prior thoughts and expectations, but only over a short time period. Thus, awareness of our actions is a dynamic and relatively flexible mixture of what we intend to do, and what our motor system actually does.     

Evaluating warning sound urgency with reaction times

It is well-established that subjective judgments of perceived urgency of alarm sounds can be affected by acoustic parameters. In this study, the authors investigated an objective measurement, the reaction time (RT), to test the effectiveness of temporal parameters of sounds in the context of warning sounds. Three experiments were performed using a RT paradigm, with two different concurrent visuomotor tracking tasks simulating driving conditions. Experiments 1 and 2 show that RT decreases as interonset interval (IOI) decreases, where IOI is defined as the time elapsed from the onset of one sound pulse to the onset of the next. Experiment 3 shows that temporal irregularity between pulses can capture a listener's attention. These findings lead to concrete recommendations: IOI can be used to modulate warning sound urgency; and temporal irregularity can provoke an arousal effect in listeners. The authors also argue that the RT paradigm provides a useful tool for clarifying some of the factors involved in alarm processing.