Graphical Data Analysis on the Circle: Wrap-Around Time Series Plots for (Interrupted) Time Series Designs

Many data structures, particularly time series data, are naturally seasonal, cyclical, or otherwise circular. Past graphical methods for time series have focused on linear plots. In this article, we move graphical analysis onto the circle. We focus on 2 particular methods, one old and one new. Rose diagrams are circular histograms and can be produced in several different forms using the RRose software system. In addition, we propose, develop, illustrate, and provide software support for a new circular graphical method, called Wrap-Around Time Series Plots (WATS Plots), which is a graphical method useful to support time series analyses in general but in particular in relation to interrupted time series designs. We illustrate the use of WATS Plots with an interrupted time series design evaluating the effect of the Oklahoma City bombing on birthrates in Oklahoma County during the 10 years surrounding the bombing of the Murrah Building in Oklahoma City. We compare WATS Plots with linear time series representations and overlay them with smoothing and error bands. Each method is shown to have advantages in relation to the other; in our example, the WATS Plots more clearly show the existence and effect size of the fertility differential.     

Severe Social Withdrawal: Cultural Variation in Past Hikikomori Experiences of University Students in Nigeria,Singapore, and the United States

Hikikomori (social withdrawal that lasts six months or longer) is a growing problem among Japanese adolescents and young adults, with recent estimates that approximately 1% of Japanese youths will suffer from an episode of hikikomori in their lifetimes. What remains unclear is whether hikikomori is a culture-bound syndrome or a condition impacting youths around the globe. Hence, the self-reported prevalence and psychosocial correlates of past experiences with hikikomori were examined in cross-sectional samples of university students from Singapore (n?=?147), Nigeria (n?=?151), and the United States (n?=?301). Following tests of measurement invariance, comparisons showed that past experiences with hikikomori were related to elevated levels of current loneliness and depressive symptoms in each sample. However, analyses also revealed evidence of cultural variation in both the prevalence and the psychosocial correlates associated with past experiences of hikikomori, which taken together, provide preliminary evidence that the culture-bound characterization of hikikomori may not be appropriate.     

The Visuomotor Mental Rotation Task: Visuomotor Transformation Times Are Reduced for Small and Perceptually Familiar Angles

In the visuomotor mental rotation (VMR) task, participants point to a location that deviates from a visual cue by a predetermined angle. This task elicits longer reaction times (RT) relative to tasks wherein the visual cue is spatially compatible with the movement goal. The authors previously reported that visuomotor transformations are faster and more efficient when VMR responses elicit a degree of dimensional overlap (i.e., 0° and 5°) or when the transformation involves a perceptually familiar angle (i.e., 90° or 180°; K. A. Neely & M. Heath, 2010b). One caveat to this finding is that standard and VMR responses were completed in separate blocks of trials. Thus, between-task differences not only reflect the temporal demands of the visuomotor transformations, but also reflect the temporal cost of response inhibition. The goal of this study was to isolate the time cost of visuomotor transformations in the VMR task. The results demonstrated that visuomotor transformations are more efficient and effective when the response entails a degree of dimensional overlap between target and response (i.e., when the angular disparity between the responses is small) or when the transformation angle is perceptually familiar.     

When relationships do not live up to benevolent ideals: Women's benevolent sexism and sensitivity to relationship problems

Benevolent sexism promises women a revered place within intimate relationships, which should lead to greater dissatisfaction when they face relationship difficulties. We collected self‐reports of relationship problems and relationship satisfaction (Study 1; N = 91 heterosexual couples), relationship problems and relationship evaluations daily over 3 weeks (Study 1), and hurtful partner behaviour and relationship evaluations over 10 days (Study 2; N = 86 women). Women's endorsement of benevolent sexism predicted sharper declines in relationship satisfaction when they faced greater relationship problems (Study 1) and hurtful partner behaviour (Study 2). These effects were magnified in longer relationships (Studies 1 and 2), indicating that the sensitivity to relationship problems associated with women's endorsement of benevolent sexism is particularly pronounced when women have more invested in their relationship role being revered and cherished. The results suggest that women who endorse benevolent sexism are vulnerable within their relationships because their satisfaction is contingent upon the fulfilment of the promises of benevolent sexism. Copyright © 2013 John Wiley & Sons, Ltd.     

Three more semantic serial position functions and a SIMPLE explanation

There are innumerable demonstrations of serial position functions—with characteristic primacy and recency effects—in episodic tasks, but there are only a handful of such demonstrations in semantic memory tasks, and those demonstrations have used only two types of stimuli. Here, we provide three more examples of serial position functions when recalling from semantic memory. Participants were asked to reconstruct the order of (1) two cartoon theme song lyrics, (2) the seven Harry Potter books, and (3) two sets of movies, and all three demonstrations yielded conventional-looking serial position functions with primacy and recency effects. The data were well-fit by SIMPLE, a local distinctiveness model of memory that was originally designed to account for serial position effects in short- and long-term episodic memory. According to SIMPLE, serial position functions in both episodic and semantic memory tasks arise from the same type of processing: Items that are more separated from their close neighbors in psychological space at the time of recall will be better remembered. We argue that currently available evidence suggests that serial position functions observed when recalling items that are presumably in semantic memory arise because of the same processes as those observed when recalling items that are presumably in episodic memory.     

Mortality salience increases death-anxiety for individuals low in personal need for structure

Research derived from terror management theory suggests that death cognition does not lead to death-anxiety because people respond to thoughts of death by turning to social and cultural structures that provide a sense of psychological security. However, recent research indicates that it is people high, but not low, in personal need for structure that turn to social and cultural structures in response to heightened death cognition. Such findings suggest that people low in PNS may be vulnerable to experiencing death-anxiety when death thoughts are activated. The current study explored this possibility. Individual differences in personal need for structure were measured and death cognition (mortality salience) was manipulated. Subsequently, death-anxiety was assessed. Mortality salience increased death-anxiety, but only among individuals low in personal need for structure.