Postural fluctuations during pointing from a unilateral or bilateral stance

An experiment was conducted to compare the effects of bilateral and unilateral stance on postural fluctuations and intralimb coordination during active balance control. Fifteen participants stood bilaterally and unilaterally while conducting a pointing task with an outstretched arm. Excursion of center of foot pressure (CoP) and limb movements were recorded with a force plate and eight dual-axis accelerometers, respectively. Compared to bilateral stance, unilateral stance resulted in wider CoP trajectories and greater postural fluctuations, especially in the lower limbs. The limb-dependent postural fluctuations during unilateral stance were associated with an increased coupling between the upper limb segments and a decreased coupling between the segments of the stance leg. Unilateral stance further resulted in greater regularity and spectral changes in postural fluctuations of the trunk and lower limb due to increased central oscillations (8-15 Hz). The observed structural differences in postural fluctuations between unilateral and bilateral stance strongly suggested that the postural control system modulates joint stiffness in a stance-dependent manner. Probably, in unilateral stance, attentive control was shifted to the stance leg at the expense of increasing arm stiffness to reduce movement redundancy.     

Is peer victimization related to body esteem in 10-year-old girls and boys?

Several studies show that a history of exposure to appearance-related teasing is linked to body dissatisfaction. This study extends those findings by examining the impact of bullying, and other forms of peer victimization, on different aspects of 10-year-old girls’ and boys’ body esteem. Participants were 960 Swedish 10-year-olds, 515 girls and 445 boys. Principal results show that social exclusion is related to 10-year-olds’ evaluations of their general appearance, to evaluations of their weight, and to beliefs about how others perceive their appearance. Furthermore, bullied girls have poorer body esteem in terms of beliefs of how others perceive their appearance than do bullied boys. Appearance teasing was associated with girls’ poorer body esteem in terms of general appearance and beliefs of others views of their appearance. For boys, teasing was associated with poorer body esteem on all dimensions. Thus, this study implies that a wider range of peer victimization relates to children's negative self-perceptions than was former known.     

Two Moralities: Reinterpreting the Findings of Empirical Research on Moral Reasoning in Taiwan

This paper reinterprets the findings of previous empirical research on moral reasoning and moral judgment conducted in Taiwan using Kohlberg's research paradigm. It consists of three major parts. The first part explores Kohlberg's theory of moral development and its limitations. Gibb's (1979) two-phase model is used to emphasize the necessity of studying cultural heritage in understanding the prevalent moral reasoning of existential phase adults in a given society. The second part presents an analysis of Confucian ethics (Hwang, 1995), and proposes a conceptual scheme for discerning the significant features of Confucian ethics by referring to distinctions between positive/negative and imperfect/perfect duties. The discretionary features of Confucian ethics are further analyzed in terms of Shweder et al .'s (1990) scheme for discerning a rationally defensible moral code. In addition, the Confucian moral dilemma and its modern fate in the New-Culture Movement of the May Fourth period on mainland China, and the 1960s Gong De Movement in Taiwan are discussed. The third part of this paper reinterprets the findings of several empirical studies on moral reasoning in Taiwanese society. Special attention is paid to Cheng's (1991) data from interviews with a group of college students using Kohlberg's moral dilemma. The implication of her findings is discussed on the basis of the new conceptual scheme.     

Correlates of the objective and subjective experiences of sexual harassment in high school

The present study used retrospective reports of primarily white female university students to examine a number of issues related to sexual harassment in high school. Results indicate that underperception of sexual harassment in high school exists in that reports of objective experiences appear to be quite high and exceed the actual labelling of these experiences as sexual harassment. Those who reported having an overprotective mother, observing fewer positive behaviors between their parents, and experiencing unwanted sexual contact during childhood experienced a greater number of objectively-defined incidents of sexual harassment, than those who did not. Underperception of sexual harassment was associated with a greater frequency of negative behaviors directed toward the father by the mother, but was not related to experiencing unwanted sexual contact during childhood.We would like to thank W. A. Fisher, D. Hazlewood, J. Olson, and the anonymous reviewers for their helpful comments.     

Personality Adjustment in College Students With a Parent Perceived as Alcoholic or Nonalcoholic

Adjustment of 547 college students was examined by the variables of alcoholic parentage and participant gender. Results from a multivariate analysis of variance, using the Diagnostic Inventory of Personality and Symptoms, indicated significant main effects for gender but not for alcoholic parentage. Significant gender differences occurred for alcohol abuse, drug abuse, paranoid psychosis, affective depression, anxiety disorders, psychological factors affecting physical condition, immature character, and neurotic character. Findings suggest that college students from alcoholic homes should not be distinguished from the general population in terms of their adjustment.     

Media Multitasking Effects on Cognitive vs. Attitudinal Outcomes: A Meta‐Analysis

Despite the recent proliferation of research on media multitasking, a comprehensive meta‐analytic review of its effects has not been available. Based on a review of 49 media multitasking studies, this meta‐analysis showed that multitasking has negative effects on cognitive outcomes, whereas it has positive effects on attitudinal (or persuasion‐related) outcomes. Moderator analyses suggested that the negative effects of multitasking on cognitive outcomes varied by (a) user control, (b) task relevance, and (c) task contiguity. Specifically, multitasking had greater effects (a) when media users had less control over the media, (b) for tasks that were unrelated, and (c) for tasks that were physically distant. Implications for future multitasking research are further discussed.     

Functional Multiple-Set Canonical Correlation Analysis

We propose functional multiple-set canonical correlation analysis for exploring associations among multiple sets of functions. The proposed method includes functional canonical correlation analysis as a special case when only two sets of functions are considered. As in classical multiple-set canonical correlation analysis, computationally, the method solves a matrix eigen-analysis problem through the adoption of a basis expansion approach to approximating data and weight functions. We apply the proposed method to functional magnetic resonance imaging (fMRI) data to identify networks of neural activity that are commonly activated across subjects while carrying out a working memory task.     

Dynamic GSCA (Generalized Structured Component Analysis) with Applications to the Analysis of Effective Connectivity in Functional Neuroimaging Data

We propose a new method of structural equation modeling (SEM) for longitudinal and time series data, named Dynamic GSCA (Generalized Structured Component Analysis). The proposed method extends the original GSCA by incorporating a multivariate autoregressive model to account for the dynamic nature of data taken over time. Dynamic GSCA also incorporates direct and modulating effects of input variables on specific latent variables and on connections between latent variables, respectively. An alternating least square (ALS) algorithm is developed for parameter estimation. An improved bootstrap method called a modified moving block bootstrap method is used to assess reliability of parameter estimates, which deals with time dependence between consecutive observations effectively. We analyze synthetic and real data to illustrate the feasibility of the proposed method.