Go naked: diapers affect infant walking

In light of cross‐cultural and experimental research highlighting effects of childrearing practices on infant motor skill, we asked whether wearing diapers, a seemingly innocuous childrearing practice, affects infant walking. Diapers introduce bulk between the legs, potentially exacerbating infants’ poor balance and wide stance. We show that walking is adversely affected by old‐fashioned cloth diapers, and that even modern disposable diapers – habitually worn by most infants in the sample – incur a cost relative to walking naked. Infants displayed less mature gait patterns and more missteps and falls while wearing diapers. Thus, infants’ own diapers constitute an ongoing biomechanical perturbation while learning to walk. Furthermore, shifts in diapering practices may have contributed to historical and cross‐cultural differences in infant walking.     

Navigating the Dialectic: Following Ethical Rules Versus Culturally Appropriate Practice

This study investigated the association between reporting the experience of childhood abuse and perceptions of safety in current adult relationships. Data from 177 couples were collected from both clinic and community samples. Results suggest that when violence is present, people who reported being abused as a child are more likely to have lower feelings of safety in their current relationship than those who have not been abused in childhood. When no violence is present in the relationship, there is no difference in perceptions of safety between those who were and were not abused as a child. Clinical implications are discussed.     

Using the Personal Stroop to Detect Children's Awareness of Social Rejection by Peers

A personal (or emotional) Stroop methodology was used to assess children's internalisation of peer rejection. A computerised Stroop colour-naming task with a voice-activated timer was given to 59 socially popular and unpopular elementary schoolchildren. We presented negative social words and three sets of control words (positive social, negative nonsocial, and positive nonsocial) individually and in random order. Unpopular children (but not popular children) demonstrated significantly greater colour-naming interference on negative social words versus control words, suggesting that they had internalised personally relevant social status information. This sensitivity to negative social content words remained even after controlling for grade level, self-reported depressive symptoms, and self-reported social competence. Advantages and disadvantages of the personal Stroop methodology relative to self-report methodologies are discussed.     

Body Surveillance and Body Shame in College Men: Are Men Who Self-Objectify Less Hopeful?

The current study examined self-objectification and hope in a sample of undergraduate men from a Midwestern university in the United States (N?=?227). Specifically, an online survey utilizing self-report measures examined the associations between body surveillance, body shame, trait hope, social relationship hope, and romantic relationship hope were considered through the lenses of Objectification Theory and the Broaden and Build Theory of Positive Emotions. Consistent with Hypothesis 1, bivariate correlations showed that more body surveillance was associated with less trait agency, less trait pathways, less social relationship pathways, and less romantic relationship pathways. As well, more body shame was associated with less trait agency, less trait pathways, less social relationship pathways, less romantic relationship agency, and less romantic relationship pathways. Additionally, consistent with Hypothesis 2 and the model proposed by Objectification Theory, body shame explained relations between body surveillance and hope, specifically, trait agency, social relationship pathways, romantic relationship agency, and romantic relationship pathways in a path analysis. This work fills an important gap in the current literature, as it is the only study to date that examines relations between self-objectification and hope, and furthers objectification research among men. Results are discussed within the context of Objectification Theory and the Broaden and Build Theory of Positive Emotions. Implications and future directions are discussed.     

Appearance matters: Attentional orienting by new objects in the precueing paradigm

Five experiments examined whether the appearance of a new object is able to orient attention in the absence of an accompanying sensory transient. A variant of the precueing paradigm (Posner & Cohen, 1984 Posner, M. I. and Cohen, Y. 1984. “Components of attention”. In Attention and performance X, Edited by: Bouma, H. and Bouwhuis, D. G. 55–66. Hove, , UK: Lawrence Erlbaum Associates Ltd.  [Google Scholar]) was employed in which the cue was the onset of a new object. Crucially, the new object's appearance was not associated with any unique sensory transient. This was achieved by using the variant “annulus” procedure recently developed by Franconeri, Hollingworth, and Simons (2005). Results showed that unless observers had an attentional set explicitly biased against onset, a validity effect was observed such that response times were shorter for targets occurring at the location of the new object relative to when targets occurred at the location of the “old” object. We conclude that new onsets do not need to be associated with a unique sensory transient in order to orient attention.     

Bias in Cross-Sectional Analyses of Longitudinal Mediation: Partial and Complete Mediation Under an Autoregressive Model

Maxwell and Cole (2007) Maxwell, S. E. and Cole, D. A. 2007. Bias in cross-sectional analyses of longitudinal mediation. Psychological Methods, 12: 23–44. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] showed that cross-sectional approaches to mediation typically generate substantially biased estimates of longitudinal parameters in the special case of complete mediation. However, their results did not apply to the more typical case of partial mediation. We extend their previous work by showing that substantial bias can also occur with partial mediation. In particular, cross-sectional analyses can imply the existence of a substantial indirect effect even when the true longitudinal indirect effect is zero. Thus, a variable that is found to be a strong mediator in a cross-sectional analysis may not be a mediator at all in a longitudinal analysis. In addition, we show that very different combinations of longitudinal parameter values can lead to essentially identical cross-sectional correlations, raising serious questions about the interpretability of cross-sectional mediation data. More generally, researchers are encouraged to consider a wide variety of possible mediation models beyond simple cross-sectional models, including but not restricted to autoregressive models of change.     

The Influence of Competition on the Efficiency of an Isometric Muscle Contraction

36 male Ss from collegiate intramural athletic teams were asked to maintain 50% of their maximum voluntary contraction on an iso-metric handle as long as possible. Ss were divided into 2 groups. One group performed individually while the other group, in teams of 3 Ss each, competed for a team prize. During the session, the active muscle was continuously monitored by EMG. The introduction of the motivational factors of competition and team presence did not increase the mean endurance time, but muscle EMG activity was significantly increased when additional motivational factors were introduced. It was concluded that team presence and competition are better described as stress factors which reduce the efficiency of the muscles. The reduction of efficiency is explained both in terms of increased activity of the antagonistic muscles and an increase in S’s general arousal level.     

The Effect of Order and Rate of Presentation of Stimuli Upon the Establishment of a Conditioned Discrimination

The modified interfering cue theory put forward by Fletcher et al. (2) to explain performance in the ambiguous cue problem (ACP) was examined. Eight-year-old children were first trained to acquire response tendencies to the individual cues of this problem. When presented subsequently with the problem, the children showed marked differences in the number and type of errors made. The results were interpreted as supporting the theory of Fletcher et al. It was also suggested that the cues with clear positive or negative values were employed by the subjects to limit or neutralize the interference caused by the ambiguous cue.     

Naturalistic Experience and the Early Use of Symbolic Artifacts

Experience with a variety of symbolic artifacts has been proposed as a mechanism underlying symbolic development. In this study, the parents of 120 2-year-old children who participated in symbolic object retrieval tasks completed a questionnaire regarding their children's naturalistic experience with symbolic artifacts and activities. In separate regressions predicting children's use of video and pictures for information in experimental tasks, predictor variables such as children's exposure to live video and their emerging understanding of graphic representation were significant, even after accounting for the effects of children's vocabulary and birth order and parents' education and occupation. The results support the role of experience in children's early detection of symbolic relations.