Effects of Rumination and Worry on Sleep

Recent research suggests that the stress-sleep relationship is mediated by pre-sleep arousal (PSA) and that cognitive arousal has a stronger mediating effect than somatic arousal; however, this has not been directly tested. Using multilevel moderated mediation, we compared the effects of cognitive arousal and somatic arousal within the stress-sleep relationship. We also assessed whether two forms of repetitive negative thought—rumination and worry—are similarly involved in the stress-sleep relationship. Data was collected from 178 participants across the United States via an online platform. Participants completed baseline self-report surveys examining rumination tendencies and worry tendencies. Over the course of 2 weeks, participants completed daily questionnaires assessing daily stress, PSA, and sleep quality. Results indicated that indirect effects from stress to sleep quality via PSA were statistically significant at low and high levels of rumination and worry, and people at high levels of rumination and worry had stronger relationships between stress and PSA. Across all models, cognitive arousal consistently accounted for more of the variance in the stress-sleep relationship as compared to somatic arousal. Implications for the cognitive behavioral treatment of insomnia are discussed.     

Acceptable timing error at ball-bat impact for different pitches and its implications for baseball skills

In baseball hitting, batters need high precision timing control to hit the ball with bat’s sweet spot. Knowing the acceptable range of timing error for hitting the ball in the aimed direction for various pitch types is helpful to understand whether the cause of the batter's mis-hit is a spatial or temporal error and highlight the motor skills required by the batter. The purpose of this study was to determine the acceptable timing error in different baseball pitches and the impact characteristics of mis-hits. Twenty-six high school baseball players hit a ball launched from a pitching machine with three types of pitches: fastballs, curveballs, and slowballs. We recorded the three-dimensional behavior of the ball, bat, and human body (pelvis) using an optical motion capture system. We then defined the optimal impact location based on timing accuracy, and determined the acceptable range of timing error by the interactive relationship between the horizontal orientation of the bat’s long axis at the time of ball impact and the horizontal direction of the batted ball. The ±30° width in the horizontal direction of the batted ball was set as the precondition for the tolerance of timing. The acceptable timing error was ±7.9 ms for fastballs, ±10.7 ms for curveballs, and ±10.7 ms for slowballs, and the optimal timing for outside pitches was approximately 10 ms later than that for inside pitches. The timing error was also explained 38.1% by variation in the impact location along the long axis of the bat (R² = 0.381, P < 0.001) and was minimized at a position close to the bat’s sweet spot. These results suggest that the optimal impact location and acceptable range of timing error depend on the pitching course and speed and that timing accuracy is essential to achieve the spatial accuracy required to hit the ball at the bat’s sweet spot.     

Direct and indirect associations of cognitive reappraisal and suppression with disease biomarkers

Objective: Habitual use of emotion regulation strategies may influence physical health. We examined whether the tendencies to employ cognitive reappraisal and suppression were associated with health biomarkers, and whether stress and sleep quality mediated these associations. Design & main outcome measures: Using data from the Biomarkers substudy (n?=?1255) of the national Midlife in the U.S. Study, we tested the hypothesis that there would be indirect, but not direct, associations of cognitive reappraisal and suppression to biomarker indicators of multisystem physiological dysregulation, that is, allostatic load (AL). We computed the proportion of biomarkers in the highest risk quartile within seven biological systems, and summed these scores to compute AL. Associations with the biological systems were also examined separately.Results: Neither reappraisal nor suppression was directly associated with AL or biomarker function in the seven biological systems. Suppression was indirectly associated with higher AL and greater dysregulation in the inflammatory, metabolic, and hypothalamic-pituitary-adrenal systems via its relations to stress and sleep, p?<?0.05. Reappraisal was indirectly associated with lower AL and less metabolic and inflammatory dysregulation, ps<0.05.Conclusions: Suppression and reappraisal may have different downstream health effects via stress, sleep, and biomarker expression, suggesting malleable emotion regulation strategies may be an important intervention target.     

Gender differences in memory for objects and their locations: a study on automatic versus controlled encoding and retrieval contexts

Object-location memory is the only spatial task where female subjects have been shown to outperform males. This result is not consistent across all studies, and may be due to the combination of the multi-component structure of object location memory with the conditions under which different studies were done. Possible gender differences in object location memory and its component object identity memory were assessed in the present study. In order to disentangle these two components, an object location memory task (in which objects had to be relocated in daily environments), and a separate object identity recognition task were carried out. This study also focused on the conditions under which object locations were encoded and retrieved. Only half of the participants were aware of the fact that object locations had to be retrieved later on. Moreover, by applying the 'process dissociation procedure' to the object location memory assessments and the 'remember-know' paradigm to the object identity measure, the amount of explicit (conscious) and implicit (unconscious) retrieval was estimated for each component. In general, females performed better than males on the object location memory task. However, when controlled for object identity memory, females no longer outperformed males, whereas they did not obtain a higher general object identity memory score, nor did they have more explicit or implicit recollection of the object identities. These complicated effects might stem from a difference between males and females, in the way locations or associations between objects and locations are retrieved. In general, participants had more explicit (conscious) recollection than implicit (unconscious) recollection. No effect of encoding context was found, nor any interaction effect of gender, encoding and retrieval context.     

Particularism and the Spatial Location of Events

According to the Particularist Theory of Events, events are real things that have a spatiotemporal location. I argue that some events do not have a spatial location in the sense required by the theory. These events are ordinary, nonmental events like Smith’s investigating the murder and Carol’s putting her coat on the chair. I discuss the significance of these counterexamples for the theory.

Bayesian IRT Guessing Models for Partial Guessing Behaviors

According to the recent Nation’s Report Card, 12th-graders failed to produce gains on the 2005 National Assessment of Educational Progress (NAEP) despite earning better grades on average. One possible explanation is that 12th-graders were not motivated taking the NAEP, which is a low-stakes test. We develop three Bayesian IRT mixture models to describe the results from a group of examinees including both nonguessers and partial guessers. The first assumes that the guesser answers questions based on his or her knowledge up to a certain test item, and guesses thereafter. The second model assumes that the guesser answers relatively easy questions based on his or her knowledge and guesses randomly on the remaining items. The third is constructed to describe more general low-motivation behavior. It assumes that the guesser gives less and less effort as he or she proceeds through the test. The models can provide not only consistent estimates of IRT parameters but also estimates of each examinee’s nonguesser/guesser status and degree of guessing behavior. We show results of a simulation study comparing the performance of the three guessing models to the 2PL-IRT model. Finally, an analysis of real data from a low-stakes test administered to university students is presented.     

抑制能力与工作记忆能量的相关研究

采用汉字材料的负启动范式,考察了大学生和老年人被试的特性和空间位置抑制能力,及其与工作记忆能量的相关。结果发现：位置抑制能力与工作记忆能量无显著相关,而特性抑制能力与工作记忆能量存在正相关。说明个体的分心抑制能力是影响其工作记忆能量的重要因素。但工作记忆的年龄差异可能还受分心抑制之外其它认知因素的影响。     

Co‐sleeping: Help or hindrance for young children's independence?

This study investigated the relationship between sleep arrangements and claims regarding possible problems and benefits related to co‐sleeping. Participants were 83 mothers of preschool‐aged children. Data were collected through parent questionnaires. Early co‐sleepers (who began co‐sleeping in infancy), reactive co‐sleepers (children who began co‐sleeping at or after age one), and solitary sleepers were compared on the dimensions of maternal attitudes toward sleep arrangements; night wakings and bedtime struggles; children's self‐reliance and independence in social and sleep‐related behaviours; and maternal autonomy support. The hypothesis that co‐sleeping would interfere with children's independence was partially supported: solitary sleepers fell asleep alone, slept through the night, and weaned earlier than the co‐sleepers. However, early co‐sleeping children were more self‐reliant (e.g. ability to dress oneself) and exhibited more social independence (e.g. make friends by oneself). Mothers of early co‐sleeping children were least favourable toward solitary sleep arrangements and most supportive of their child's autonomy, as compared to mothers in other sleep groups. Reactive co‐sleepers emerged as a distinct co‐sleeping sub‐type, with parents reporting frequent night wakings and, contrary to early co‐sleepers, experiencing these night wakings as highly disruptive. Implications for parents and pediatricians are discussed. Copyright © 2004 John Wiley & Sons, Ltd.     

电针影响脑电和睡眠及心境的研究

本研究的目的是．探讨电针对脑电和被试主观感觉(困倦、心境)的影响。我们对24位健康志愿者施以电针．4—6小时后脑电测量表明．θ波的相对功率在额、颞区呈增加趋势．其中Fp1、Fp2、F3、F4、C3、C4,F7、F8、T5显著增加;α波的相对功率呈减少趋势,其中αI相对功率在左侧额、颞区Fp1、F3、F7、T5显著减少;α2．在F4、C3、C4,O1和T3显著减少;β频段的相对功率有增有减．其中β1在C3、C4显著减少,在O2、T3、T4显著增加;β2的相对功率在F3、C3显著减少,O1、O2T4、T5、T6显著增加。电针后的问卷调查表明,多数被试有困感,电针对睡眠深度、睡眠时间、醒来次数以及晨间心境有不同程度影响。     

The developmental change in strategies parents employ to settle young children to sleep,and their relationship to infant sleeping problems,as assessed by a new questionnaire: the Parental Interactive Bedtime Behaviour Scale

The development of a new parental self‐report questionnaire, the Parental Interactive Bedtime Behaviour Scale (PIBBS) is described. The PIBBS was designed to capture a wide range of parental behaviours used to settle infants off to sleep. The commonest behaviours employed were giving a feed, talking softly to the child, cuddling in the arms, and stroking. A factor analysis revealed five settling strategies; ‘active physical comforting’ (e.g. cuddling in arms); ‘encouraging infant autonomy’ (e.g. leaving to cry); ‘movement’ (e.g. car rides), ‘passive physical comforting’ (e.g. standing next to the cot without picking the infant up), and ‘social comforting’ (e.g. reading a story). Excessive ‘active physical comforting’ and reduced ‘encourage autonomy’ strategy use was associated with infant sleeping problems. Regarding developmental change in strategy between 1 and 2 years, the later the onset at which ‘encourage autonomy’ became the principal strategy used, the more likely that persistent infant sleeping problems would be present. Factors accounting for the change in strategy use over time were: (i) parental adaptation to infant developmental maturation; (ii) the interaction between maternal cognition and strategy, and, to a lesser extent; (iii) the interaction between infant temperament and parental strategy. Copyright © 2002 John Wiley & Sons, Ltd.