A multitude of errors in menstrual-synchrony research: replies to Weller and Weller (2002) and Graham (2002)

This article replies to commentaries by A. Weller and L. Weller (2002) and by C. A. Graham (2002). The author of this reply argues that A. Weller and L. Weller merely defined away the problem of cycle variability for synchrony by assuming either that all cycles are 28-days long or that the expected difference between 2 cycles is 1/4 the mean of the cycles of 2 rhythms. In her commentary, C. A. Graham stated that A. Weller and L. Weller's later research did not use recall data, but the author of this reply shows that this is not true. Menstrual-synchrony research taken as a whole is plagued by a multitude of systematic errors that lead inevitably to the conclusion that there is no evidence for menstrual synchrony among women.     

Menstrual-cycle synchrony: problems and new directions for research

Since M. K. McClintock (1971) published the 1st study on menstrual synchrony among women, a number of other studies have also reported synchrony using a variety of methods. The most recent reports of synchrony come from A. Weller, L. Weller, and colleagues, and their findings of synchrony have been getting stronger (by their own account). In this article, the author analyzes their new methodology and presents 2 simulation studies that demonstrate how biases and errors can produce synchrony as an artifact. Two mutually reinforcing categories of errors are identified: (a) errors in calculating the expected mean onset difference between cycles when there is cycle variability and (b) errors that may result from allowing participants to fill out menstrual-cycle-onset calendars, including recall biases and the mutual exchange of information. It is suggested that synchrony may be a biological state to be avoided and that cycle variability may facilitate female mate choice.     

Menstrual synchrony can be assessed,inherent cycle variability notwithstanding: commentary on Schank (2001)

J. C. Schank (2001) argued that biases in the calculation of synchrony (due to inherent variability in the menstrual cycle) and in respondents' recall of menstrual dates can produce spurious results. In this commentary, the major flaws in J. C. Schank's arguments regarding the calculation of synchrony are presented. Low standard deviations (< 2.0) of interwomen cycle lengths were found in a reanalysis of the Bedouin family data (A. Weller & L. Weller, 1997). This obviates J. C. Schank's major assumption that a high degree of cycle variability exists and his concern that high variability produces a spurious increase of onset differences over time. Furthermore, research that has used random control groups has found significantly greater levels of synchrony in their experimental groups, refuting J. C. Schank's arguments.     

Adolescent pregnancy: effects of family support, education, and religion on the decision to carry or terminate among Puerto Rican teenagers

Why do some pregnant teenagers decide to carry to term while others terminate their pregnancy? This study examined the influence of family relationships and support, religion, and education on the decision to carry or to abort. A nonrandom sample of 43 pregnant Puerto Rican teenagers (21 who carried and 22 who aborted) were interviewed in 1982 using a 34-item interview schedule. It was found that girls in the carry group were more significantly influenced and supported by family and friends than were those in the abort group. Fathers were the least influential persons in both carry and abort groups, while mothers were the most influential in the carry group, and sisters in the abort group. Brothers, boyfriends, and best friends were more influential for carry girls than for abort girls. Contrary to expectations, girls in the abort group reported a greater degree of religiosity than did those in the carry group. Further, girls who received strong support from family and friends reported a higher degree of satisfaction with their decision than did those who received less support. Finally, girls in the abort group were more likely to continue their education than were those in the carry group. Overall, the findings of this study have immediate implications for research and counseling services. Practitioners should focus on the girls in conjunction with their families in order to achieve better results in both treatment and preventive services.     

Bedroom design and decoration: gender differences in preference and activity

This investigation examined gender differences in niche-building preference and activity among 238 8th and 9th grade boys and girls. A questionnaire was developed to measure both the actual and preferred bedroom content, bedroom design activity, and the level of perceived influence by the immediate and extended family, friends, and social institutions. Gender differences were identified for preference, activity, and influence in bedroom design and decoration. Girls and boys differed in the type of items contained in their bedrooms. Girls' rooms contained stuffed animals and pictures of people, including themselves, more frequently than the boys' rooms. In contrast, boys' rooms contained sports-related items, and things for building or that they had built themselves. Although bedroom design activity for both boys and girls was influenced by older teens, friends, media, and popular culture, boys (but not girls) were also influenced by their mothers, fathers, girlfriends, and activities such as sports, Boy or Girl Scouts, and music lessons.     

I thought we could be friends, but ...: systematic miscommunication and defensive distancing as obstacles to cross-group friendship formation

This study examined the precursors and consequences of systematic miscommunications regarding relationship interest during intergroup interaction. Pairs of previously unacquainted same-sex students (White-White, White-Chinese, or Chinese-Chinese) engaged in a relatively intimate controlled interaction. White participants who had had little prior contact with Chinese persons were more apt to exhibit a signal-amplification bias (i.e., to perceive that their overtures had conveyed more interest than was actually the case) in intergroup as compared with intragroup exchanges. In contrast, White participants with high levels of prior contact with Chinese persons and Chinese participants did not show enhanced signal amplification in intergroup relative to intragroup exchanges. These results support our hypothesis that lack of intergroup contact experience sets the stage for miscommunications regarding friendship interest. White participants' tendency to feel that they had initially communicated more interest in being friends than their Chinese partner mediated a downward shift in their actual friendship interest over time, suggesting that signal amplification triggers defensive distancing and ultimately lowers the likelihood of cross-group friendship formation.     

Perception of personal identity at home

This study aims to discover whether observers with the same cultural background as the inhabitant of a bedroom perceive common characteristics among the inhabitants. The study was carried out with 107 females who were asked to assess the inhabitants of eight bedrooms. Several slides of each bedroom were shown to participants and they had to choose from a list of seventy-six characteristics those that defined the resident of each bedroom. Results revealed that socio-demographic variables thus attributed coincided with the profiles of the inhabitants. A correspondence analysis brought to light a dimension linked to affective aspects, which was more prominent among women; whereas among men the characteristics thus attributed were more linked to practical aspects and to difficulties for social interaction. A second study was conducted to determine whether gender stereotype had any influence on the result of the previous study. The outcomes showed that this stereotype did not have any effect on the participants' judgments.     

Independent benefits of contact and friendship on attitudes toward homosexuals among authoritarians and highly identified heterosexuals

Although intergroup contact is generally associated with positive intergroup attitudes, little is known about whether individual differences moderate these relations, or how contact might operate among prejudice‐prone individuals. The present investigation explores Person × Contact and Person × Friendship interaction patterns among heterosexual university students. As expected, the positive relations of right‐wing authoritarianism (RWA) and heterosexual identification with prejudice against homosexuals were weakened when participants reported increased contact, more positive contact, direct (personal) friendships, or indirect friendships (i.e., ingroup friends with outgroup friends) with homosexuals. These patterns held after controlling statistically for each person or situation variable. Contact and friendship exerted smaller or negligible effects among low authoritarians or low identifiers. Tests of indirect effects revealed that among high authoritarians or high identifiers, contact and friendship exerted influence on attitudes through group‐level perceptions that homosexuals promote societal values and through increased self–other overlap with gay friends, each otherwise resisted by these individuals. Overall these results suggest that: (a) intergroup contact and intergroup friendship are related but distinct constructs; and (b) past findings underestimate contact effects by collapsing across levels of personal biases. Copyright © 2008 John Wiley & Sons, Ltd.     

Social Support from Family and Friends and Subjective Well-Being of Older African Americans

This study examines the impact of informal social support from family and friends on the well-being of older African Americans. Analyses are based on a nationally representative sample of older African Americans from the National Survey of American Life (n = 837). Three measures of well-being are examined: life satisfaction, happiness and self-esteem. The social support variables include frequency of contact with family and friends, subjective closeness with family and friends, and negative interactions with family. Results indicate that family contact is positively correlated with life satisfaction. Subjective closeness with family is associated with life satisfaction and happiness and both subjective closeness with friends and negative interaction with family are associated with happiness and self-esteem. There are also significant interactions between family closeness and family contact for life satisfaction, as well as friendship closeness and negative interaction with family for happiness. Overall, our study finds that family and friend relationships make unique contributions to the well-being of older African Americans. Qualitative aspects of family and friend support networks (i.e., subjective closeness, negative interactions) are more important than are structural aspects (i.e., frequency of contact). Our analysis verify that relationships with family members can both enhance and be detrimental to well-being. The findings are discussed in relation to prior research on social support and negative interaction and their unique associations with well-being among older African Americans.     

Young Children’s Physiological Reactivity during Memory Recall: Associations with Posttraumatic Stress and Parent Physiological Synchrony

Autonomic reactivity is implicated in stress response and social engagement – both key components of posttraumatic stress disorder (PTSD) – but few studies have examined autonomic reactivity in pediatric samples, and no known studies have examined physiological synchrony among children with PTSD and caregivers. In a sample of 247 young children (94 girls, 153 boys), most (85%) of whom had exposure to trauma and 40% who met criteria for PTSD, we examined children’s patterns of respiratory sinus arrhythmia (RSA) at baseline and in response to a memory recall task, as well as correspondence between parents’ and children’s RSA. Children with PTSD demonstrated significantly higher reactivity than other groups during their recollection of a traumatic memory, but not during other memory tasks. Regarding synchrony, caregivers’ and children’s RSA were more significantly and positively correlated during the trauma recall task among children who had had exposure to a potentially traumatic event but did not meet PTSD criteria, suggesting physiological synchrony may be protective in contexts of trauma. Overall, findings demonstrate physiological reactivity differences among young children with PTSD. While more work is needed to understand the meaning of parent-child physiological synchrony, these data suggest that children’s psychopathology is associated with physiological synchrony processes among young children with exposure to trauma.     

Shared Affect and Dyadic Synchrony Among Secure and Insecure Parent–Toddler Dyads

The present investigation explored the role of shared affect in parent–child dyadic synchrony during toddlerhood and examined if patterns of dyadic synchrony and shared affect differ for secure and insecure parent–child dyads. Data were collected from 128 families with toddler age children (67 girls and 61 boys) during a laboratory assessment. Mother–toddler and father–toddler interactions were coded for shared positive and negative affect, as well as dyadic synchrony. Attachment status was assessed using the Strange Situation. Data revealed that securely attached parent–toddler dyads spent more time in synchronous interaction, and less time in asynchronous interaction, than insecurely attached parent–toddler dyads. Parent–toddler synchronous interaction among both securely and insecurely attached dyads was characterized by shared positive affect. Among insecure dyads, shared negative affect was more predominate in asynchronous than in synchronous interaction. The role of individual differences in the manifestation of synchronous interaction among securely and insecurely attached parent–toddler dyads is discussed. Copyright © 2014 John Wiley & Sons, Ltd.     

Impact of fathers on daughters' age at menarche: a genetically and environmentally controlled sibling study

Girls growing up in homes without their biological fathers tend to go through puberty earlier than their peers. Whereas evolutionary theories of socialization propose that this relation is causal, it could arise from environmental or genetic confounds. To distinguish between these competing explanations, the authors used a genetically and environmentally controlled sibling comparison design to examine the effects of differential exposure to family disruption/father absence in a community sample of sister pairs. As specified by evolutionary causal theories, younger sisters had earlier menarche than their older sisters in biologically disrupted families (n = 68) but not biologically intact families (n = 93). This effect was superseded, however, by a large moderating effect of paternal dysfunction. Younger sisters from disrupted families who were exposed to serious paternal dysfunction in early childhood attained menarche 11 months earlier than either their older sisters or other younger sisters from disrupted families who were not exposed to such dysfunction. These data suggest that early exposure to disordered paternal behavior, followed by family disruption and residential separation from the father, can lead to substantially earlier menarche.     

Patterns and correlates of gun ownership among nonmetropolitan and rural middle school students

Examined prevalence of gun ownership and the links among gun ownership, reasons for gun ownership, and antisocial behavior in a sample of nonmetropolitan and rural middle school students. Participants completed the Questionnaire for Students (Olweus, 1995) and included 6,263 students from 36 elementary and middle schools, of whom most were African American (range = 46%-95% per school). Reasons for gun ownership were strongly associated with rates of antisocial behavior. Youths who owned guns for sporting reasons reported rates of antisocial behavior that were only slightly higher than those reported by youths who did not own guns. Youths who owned guns to gain respect or to frighten others reported extremely high rates of antisocial behavior. These high-risk adolescent gun owners were likely to come from families of high-risk gun owners, associate with friends who were high-risk gun owners, and engage in high rates of bullying behavior. Findings suggest that effective violence prevention programs must target high-risk youths, address risk factors that go beyond individual settings, and address a comprehensive array of risk factors.     

Interpersonal movement synchrony facilitates pro‐social behavior in children's peer‐play

The emergence of pro‐social behaviors and social interaction skills is a major focus of research on children's development. Here, we consider one important feature of human social interactions, interpersonal movement synchrony, and explore its effects on pro‐sociality among young children. Coordinated movements are a crucial part of mother–infant interactions, with important social effects extending well into childhood. Musical interactions are also known to facilitate bonding between infants and caretakers and pro‐sociality among peers. We specifically examine the pro‐social effects of interpersonal movement synchrony in a naturalistic peer‐play context among 4‐ to 6‐year‐old children. We assessed the amount of helping behavior between pairs of children following an activity that they performed synchronously or non‐synchronously. Children who engaged in synchronous play, as compared with non‐synchronous play, showed significantly more subsequent spontaneous helping behavior. Further, more mutual smiling and eye contact were observed in the synchronous condition and amounts of mutual smiling and eye contact during the movement task correlated with amount of helping behavior observed. Neither measure mediated the condition‐wise effects on helping, however. These results are discussed in terms of their contribution to existing literature and their broader implications for the development of pro‐sociality and coordinated movements in early childhood.     

The Best Friendships of Shy/Withdrawn Children: Prevalence, Stability, and Relationship Quality

The mutual best friendships of shy/withdrawn and control children were examined for prevalence, stability, best friend's characteristics, and friendship quality. Using peer nominations of shy/socially withdrawn and aggressive behaviors, two groups of children were identified from a normative sample of fifth-grade children: shy/withdrawn (n = 169) and control (nonaggressive/nonwithdrawn; n = 163). Friendship nominations, teacher reports, and friendship quality data were gathered. Results revealed that shy/withdrawn children were as likely as control children to have mutual stable best friendships. Withdrawn children's friends were more withdrawn and victimized than were the control children's best friends; further, similarities in social withdrawal and peer victimization were revealed for withdrawn children and their friends. Withdrawn children and their friends reported lower friendship quality than did control children. Results highlight the importance of both quantitative and qualitative measures of friendship when considering relationships as risk and/or protective factors.     

Daily patterns of communication and contact between Italian early adolescents and their friends

The goal of the present study was to explore patterns of communication between adolescents and their friends across both "online" and "in-person" contexts. The participants were adolescents (n?=?727) aged 11-16 years attending middle schools in urban and rural areas of Italy. Participants completed daily logs of their in-person and online contacts with friends for 20 consecutive school days. Girls reported more total contacts with their friends than did boys as well as friendships that were closer and more intimate. However, boys indicated more contact than girls via electronic communication and online. Contacts with peers in general were less frequent among the older participants, perhaps because of increasing academic demands. Participants who complemented in-person contact with friends with electronic contact were less lonely than their counterparts who were less versatile in accessing different modalities of making contact with friends.     

Friends' sexual orientation,relational quality,and mental health among gay,lesbian, and bisexual youth

Abstract The existing literature on gay, lesbian, and bisexual (GLB) youth emphasizes unique benefits of having GLB friends, but empirical studies have shown no or only small mental health advantages of having them. To unravel this contradiction, this study tested a common assumption that GLB youth develop better relational quality with their GLB friends than with straight friends. Statistical analysis used interview data from community organization participants in Indianapolis, Indiana, USA (n = 84) and employed analysis of variance and ordinary least squares regression models. GLB youth's friendships with GLB and straight peers did not differ in contact frequency, emotional closeness, and hassles. Further, GLB and straight friends were similar in the degree to which each relational quality dimension was associated with mental health.     

友伴关系与中学生的吸烟行为

友伴关系与中学生吸烟行为有非常直接的关系,然而,对此进行的研究却很少.社会网络结构分析技术的提出使研究者可以同时从友伴相互接纳和友伴地位两个角度对这一问题展开研究.从北京市1所普通中学和1所重点中学选取1091名初一至高三的学生为被试,运用NEGOPY软件包对中学生的友伴关系进行分析,结果发现,友伴相互接纳和友伴地位与中学生的吸烟行为都有显著的关系,为今后对中学生的吸烟行为进行预防和干预提供了非常重要的依据.     

Gender and social relationships among the never-married

This research explores the social networks among the growing numbers of men and women who have never married. We use a representative sample of 193 never-married men and 217 never-married women, of whom 73% of the men and 60% women of the were white and 16% of the men and 20% of the women were black. We hypothesize that single women have a more extensive social network than do men. Second, we investigate the impact of gender roles and norms of filial responsibility and selected sociodemographic variables upon social interaction by gender. Our findings indicate that gender differences are not as anticipated: (1) while never-married women interact more frequently with relatives than do never-married men, no differences were noted among friendship or neighborhood networks; (2) time spent in social interaction was more likely to differ by marital status than it was by gender; (3) compared to married persons, the never-married are overrepresented in the extreme categories of interaction, both isolated and very active; (4) gender role ideology and filial responsibility did not significantly predict social interaction for either men or women, with the exception that, among never-married men, those with lower expectations of filial responsibility spent more time with friends.The National Survey of Families and Households was funded by a grant (HD21009) from the Center for Population Research of the National Institute of Child Health and Human Development. The survey was designed and carried out at the Center for Demography and Ecology at the University of Wisconsin—Madison under the direction of Larry Bumpass and James Sweet. The fieldwork was done by the Institute for Survey Research at Temple University. The original collectors of the data do not bear any responsibility for the analyses or the interpretations presented here.