Electroencephalographic evidence for improved visual working memory performance during standing and exercise

While a substantial body of research has investigated the effects of aerobic exercise on cognitive performance, few have monitored exercise‐concurrent cognitive processes via electroencephalography and fewer still using an event‐related potential (ERP) approach. As such, little is known regarding how the temporal dynamics of cognitive processing are influenced during aerobic activity. Here, we aimed to elucidate the influence of aerobic exercise on the temporal dynamics of concurrent visual working memory (VWM) performance. Participants performed a VWM retro‐cue task at rest and during aerobic exercise across two postural modalities: seated (using a stationary bicycle) and standing upright (using a treadmill). Three consecutive phases of the VWM processing pipeline were assessed by means of lateralized ERPs: access of VWM representations, response selection, and response execution. Aerobic exercise and upright posture were found to have significant effects on VWM performance, facilitating processing speed in the retro‐cue task. This facilitation arose primarily at an intermediary stage between the phases of accessing VWM representations and response selection. Our findings hold implications not only for understanding the influence of aerobic activity on VWM, but also for contemporary models of VWM that are built exclusively on data recorded during stationary, seated conditions.     

Maternal depression and infant attachment security: A meta-analysis

The purpose of this study is to clarify the magnitude of the association between maternal depression and infant attachment nonsecurity, and to identify possible moderators of this relationship. An extensive literature search was conducted using multiple databases of both published and unpublished studies. A meta-analysis was conducted to determine the relationship between maternal depression and infant attachment security and to establish the effect size. The main findings from this meta-analysis, which included 42 studies, indicate that there is a small, yet significant, relationship between maternal depression and infant attachment nonsecurity. The rate of nonsecurity in infants of mothers with depression was approximately 20% higher than expected rates in a nonclinical population, and the association between depressive symptoms and nonsecurity was small, but significant. Infants of mothers with depression were nearly twice as likely to have a nonsecure attachment than were infants of healthy mothers. Depression measure and maternal sample source were identified as significant moderators of the odds ratio effect size. Results of this study demonstrate that there is a significant relationship between maternal depression and infant attachment nonsecurity, and suggest that interventions that focus on both maternal mental health and the attachment relationship are warranted.     

Maternal experience of their infants’ crying in the context of war trauma: Determinants and consequences

We examined, first, how prenatal maternal mental health and war trauma predicted mothers’ experience of their infant crying, indicated by emotions, cognitions, and behavior; and second, how these experiences influenced the mother–infant interaction and infant development. Participants were 511 Palestinian mothers from the Gaza Strip, reporting their war trauma, symptoms of posttraumatic stress disorder (PTSD), depression, and perceived stress during pregnancy (Time 1). They reported experiences of infant crying at 4 months (Time 2), and the mother–infant interaction and infant sensorimotor and language development at 12 months of infants’ age (Time 3). Results revealed that maternal mental health problems, but not war trauma, were important to experiences of infant crying. A high level of PTSD symptoms predicted negative emotions evoked by infant crying, and high depressive symptoms predicted low active and positive responses to crying. Unexpectedly, high prenatal perceived stress predicted high active and positive responsiveness. Concerning the consequences, mothers’ sensitive interpretation of infant crying predicted optimal infant sensorimotor development, and mothers’ active and positive responses predicted high emotional availability in mother–infant interaction. Crying is the first communication tool for infants, and mothers’ sensitive responses to crying contribute to infant well-being. Therefore, reinforcing mother's optimal responses is important when helping war-affected dyads.     

Effects of male postpartum depression on father–infant interaction: The mediating role of face processing

It is estimated that postpartum depression affects up to 25% of men. Despite such high prevalence, the majority of studies on postpartum depression are focused on mothers, and the role of paternal depression and its effects on infant development have been overlooked by researchers and clinicians. The present study aimed to fill this gap by investigating the effect of paternal postpartum depression on father–infant interactions. In addition, we examined whether differences in face recognition mediated the effects of paternal postpartum depression on father–infant interactions. A total of 61 father–infant dyads (17 postpartum depression, 44 controls) took part in the study. Results revealed that compared to controls, fathers with postpartum depression had a worse pattern of interaction with their infants on measures of responsiveness, mood, and sensitivity; they also had greater difficulty in recognizing happy adult faces, but greater facility in recognizing sad adult faces. Depressed fathers attributed greater intensities to sad adult and infant faces. The tendency to attribute greater intensity to sad adult faces was confirmed as a partial mediator of the effect of paternal postpartum depression on measures of father responsiveness and as a full mediator of the effects of paternal depression on father sensitivity. Clinical implications and suggestions for further studies are discussed.     

Neck posture is influenced by anticipation of stepping

BackgroundPostural deviations such as forward head posture (FHP) are associated with adverse health effects. The causes of these deviations are poorly understood. We hypothesized that anticipating target-directed movement could cause the head to get “ahead of” the body, interfering with optimal head/neck posture, and that the effect may be exacerbated by task difficulty and/or poor inhibitory control.MethodWe assessed posture in 45 healthy young adults standing quietly and when they anticipated walking to place a tray: in a simple condition and in conditions requiring that they bend low or balance an object on the tray. We defined FHP as neck angle relative to torso; we also measured head angle relative to neck and total neck length. We assessed inhibitory control using a Go/No-Go task, Stroop task, and Mindful Attention Awareness Scale (MAAS).ResultsFHP increased when participants anticipated movement, particularly for more difficult movements. Worse Stroop performance and lower MAAS scores correlated with higher FHP. False alarms on the Go/No-Go task correlated with a more extended head relative to the neck and with shortening of the neck when anticipating movement.ConclusionsMaintaining neutral posture may require inhibition of an impulse to put the head forward of the body when anticipating target-directed movement.     

从家长的角度探讨有关低出生体重儿的生命伦理学问题

为了了解家长关于低出生体重儿医疗救治权的观点,为医疗决策提供伦理学依据,按1：1匹配各选择124例单胎低出生体重儿及正常儿建立队列,调查两组家长对低出生体重儿医疗救治观点的认识。结果显示,两组家长大多认同低出生体重儿应积极救治且医疗救治权应当由医生和家长共同决定。因此,应加强围产期保健教育,积极预防低体重儿出生。     

Interactive silences within spontaneous early infant–father ‘dialogues’

The present longitudinal and naturalistic study aims to investigate infants' and fathers' facial expressions of emotions during pauses preceding and following spontaneous early infant–father conversation. Studying emotional expressions in the course of pauses in early infant–father interaction is important because it may extend our knowledge on how, without being able to speak, infants begin communication and develop a capacity to share understanding of what they and Significant Others (such as fathers) mean by what they do. Eleven infant–father dyads from Crete, Greece, were observed during their natural interactions at home from the second to the sixth month of life. The microanalysis of fathers' and infants' facial expressions of emotions provided evidence that: (a) in the course of pauses preceding and following early infant–father conversation, either the infant is interested in the father while the latter expresses pleasure to the infant, or the infant expresses external interest while the father is interested in the infant, (b) infants seem to attune their descending and stable emotional intensity to the same direction as their father's emotional intensity, (c) infants and fathers remain consistent in their emotional expression in the beginning and at the end of the pause, and (d) infant and paternal pleasure and interest did not change significantly across the nine age points of this study. Exploratory analysis of the relationship of paternal and infant emotional expressions across infants' birth order provided evidence of certain differences and similarities. It is proposed that pausal interruptions preceding and following free early infant–father ‘dialogues’ constitute interactive silences, since in their course there is evidence of inter‐subjective emotional coordination and intra‐subjective regulation of emotion. Copyright © 2008 John Wiley & Sons, Ltd.     

Toddlers' use of cues in a search task

Search for a ball that has undergone hidden motion rapidly improves during the second year of life (Dev. Psychol., 2000; 36 :394–401). In three experiments we investigated whether the poor performance of younger toddlers was due to attentional failure by highlighting the major cue for the hidden object. We observed only slight improvement in search behaviour. We performed two other experiments that tested the depth of understanding of 3‐year‐olds in this task and found that their performance was robust to changes in the apparatus and experimental procedures. Overall, the results point to a rapidly developing ability in the second year of life to either reason about space or select the correct motor response in search tasks. Copyright © 2008 John Wiley & Sons, Ltd.     

The Level of Detail in Infants' Word Learning

ABSTRACT— This article summarizes recent findings on infant word learning and recognition. Infants initially store very detailed representations of words, including details that are not truly necessary for word recognition. As they are exposed to more varied productions of words, they develop more sophisticated knowledge about which details are important, and streamline their representations, allowing them to better recognize words across different contexts, speakers, and environments.     

Parental assessment of early childhood development: biological and social covariates

This study uses data from the National Longitudinal Survey of Children and Youth (N=8605) to investigate the effects of unfavourable birth outcomes and dimensions of the family environment on the development of Canadian children aged 0–47 months. Among children under 24 months of age, it was found that sex of the child, birth order and low birthweight were significant covariates while the familial environment tended to have little influence. However, among children aged 24–47 months, effects of parenting style, social support, and positive social‐structural conditions of the family supplemented the effects of sex of the child and low birthweight. The results suggest that the cumulative effects of a positive family environment begin to occlude the neonatal disadvantages in the first 47 months of life. Copyright © 2003 John Wiley & Sons, Ltd.