The nature of adult twin relationships: an attachment-theoretical perspective

Twin relationships have been hailed as one of the most unique and intimate kinds of relationships. Unfortunately, there is a paucity of empirical research that addresses the interpersonal nature of twin relationships. In this article, the authors argue that attachment theory may provide a useful framework for understanding the nature of twin relationships. The authors present data indicating that (a) twins are more likely than non-twin siblings to use their sibling as an attachment figure; (b) the developmental course of twin attachment differs from that of other attachments; and (c) certain factors, such as genetic relatedness, empathy, including the other in the self, and shared experiences, may impact the extent to which twins use one another as attachment figures.     

Effects of hearing the past, present, or future during music performance

Three experiments were performed to explore the effects of mismatches between actions (key-presses) and the contents of auditory feedback (pitch events) during music performance. Pianists performed melodies from memory during altered auditory feedback that was synchronized with key-presses but matched the pitch of other sequence events. Feedback direction was manipulated by presenting pitches that matched events intended for the past (delays; Experiments 1 and 3) or the future (prelays; Experiments 2 and 3). Feedback distance was manipulated by varying the absolute separation between the current event and the location of the feedback pitch. All alterations disrupted the accuracy of performance (pitch errors) more so than timing. Serial-ordering errors indicated confusions among proximal and metrically similar events, consistent with the predictions of an incremental planning model (Palmer & Pfordresher, 2003). Patterns of serial-ordering errors suggested that performers compensate for the disruptive effects of altered feedback by changing event activations during planning.     

Adoption and cognitive development: a meta-analytic comparison of adopted and nonadopted children's IQ and school performance

This meta-analysis of 62 studies (N=17,767 adopted children) examined whether the cognitive development of adopted children differed from that of (a) children who remained in institutional care or in the birth family and (b) their current (environmental) nonadopted siblings or peers. Adopted children scored higher on IQ tests than their nonadopted siblings or peers who stayed behind, and their school performance was better. Adopted children did not differ from their nonadopted environmental peers or siblings in IQ, but their school performance and language abilities lagged behind, and more adopted children developed learning problems. Taken together, the meta-analyses document the positive impact of adoption on the children's cognitive development and their remarkably normal cognitive competence but delayed school performance.     

Context processing and context maintenance in healthy aging and early stage dementia of the Alzheimer's type

Declines in the ability to process context information may represent a fundamental mechanism of age-related cognitive changes. Two components of context processing--activation/updating and maintenance--were examined in a sample of healthy younger and older adults, along with individuals suffering from early stage dementia of the Alzheimer's type (DAT). All older adult groups showed context activation/updating impairments, whereas context maintenance was only impaired in the oldest adults (age>75 years) and was further exacerbated in DAT individuals. The results suggest that context processing may be composed of functionally dissociable components and point to the utility of this construct in understanding the timecourse of cognitive decline in healthy and pathological aging.     

Language in benign childhood epilepsy with centro-temporal spikes abbreviated form: rolandic epilepsy and language

Although Benign Childhood Epilepsy with Centrotemporal Spikes (BECTS) has a good prognosis, a few studies have suggested the existence of language disorders relating to the interictal dysfunction of perisylvian language areas. In this study, we focused on language assessment in 16 children aged 6-15 currently affected by BECTS or in remission. An important proportion of children showed moderate or more severe language impairment. The most affected domains were expressive grammar and literacy skills. We found linguistic deficits during the course of epilepsy but also persistent deficits in children in remission, suggesting possible long-term effects. Our results support the hypothesis that BECTS may be associated with impairment to language and suggest the possibility of a direct link between epileptic activity and language development, and the existence of long-term consequences.     

Robustness of the rule-learning effect in 7-month-old infants: A close,multicenter replication of Marcus et al. (1999)

We conducted a close replication of the seminal work by Marcus and colleagues from 1999, which showed that after a brief auditory exposure phase, 7-month-old infants were able to learn and generalize a rule to novel syllables not previously present in the exposure phase. This work became the foundation for the theoretical framework by which we assume that infants are able to learn abstract representations and generalize linguistic rules. While some extensions on the original work have shown evidence of rule learning, the outcomes are mixed, and an exact replication of Marcus et al.'s study has thus far not been reported. A recent meta-analysis by Rabagliati and colleagues brings to light that the rule-learning effect depends on stimulus type (e.g., meaningfulness, speech vs. nonspeech) and is not as robust as often assumed. In light of the theoretical importance of the issue at stake, it is appropriate and necessary to assess the replicability and robustness of Marcus et al.'s findings. Here we have undertaken a replication across four labs with a large sample of 7-month-old infants (N = 96), using the same exposure patterns (ABA and ABB), methodology (Headturn Preference Paradigm), and original stimuli. As in the original study, we tested the hypothesis that infants are able to learn abstract “algebraic” rules and apply them to novel input. Our results did not replicate the original findings: infants showed no difference in looking time between test patterns consistent or inconsistent with the familiarization pattern they were exposed to.     

Chinese childbearing decision-making in mainland China in the post-one-child-policy era

In 2016, China enacted its two-child policy, further lifted to a three-child policy in 2021, in response to low birth rates and imbalanced sex ratios resulting from the almost 40-year one-child policy. Despite this, China's birthrate is at a historic low as fewer parents are having children. Now more than ever, inductive explorations are needed to understand what motivates Chinese parents to have first and second children in the post-one-child policy era, particularly explorations that situate individual decision-making within the larger social context. Individual and relational choices occur in larger sociopolitical contexts. Understanding these “personal” actions involves considering how micro and macro processes inform each other. In this study, we elicited qualitative responses from Chinese mothers (N = 117) with two children in early childhood (firstborn ≤8 years old) from Liao Ning province. Most mothers were well educated, employed, and married to children's fathers. Using inductive thematic analysis procedures, we coded qualitative responses about the factors that motivated mothers to have first and second children. Our data revealed that (a) mothers expressed different reasons for having firstborns compared to secondborns, and (b) decision-making occurred against a backdrop of interacting micro-level and macro-level influences (e.g., cultural norms, national policy changes). In particular, mothers described the decision to have secondborns as more deliberative than with firstborns, considering long-term benefits siblinghood and shared demands of elderly caregiving. If efforts to stimulate the national birthrate are likely to succeed, policymakers should consider micro-level as well as macro-level factors that shape mothers' childbearing decision-making.     

REDUCING THE ILLEGAL SALES OF CIGARETTES TO MINORS: ANALYSIS OF ALTERNATIVE ENFORCEMENT SCHEDULES

The majority of adolescent smokers are able to purchase cigarettes even though laws prohibit the sale of cigarettes to minors (Radecki & Zdunich, 1993). The present study focused on merchant licensing, civil penalties, and monitoring of merchant behavior. Several different schedules of enforcement in the city of Chicago were evaluated to determine the optimal schedules to reduce the sale of cigarettes to minors in a major metropolitan area. Schedules of 2, 4, and 6 months were effective in reducing illegal sales, from 86% to 19%, 87% to 34%, and 87% to 42%, respectively. In a control condition, illegal sales remained high (approximately 84%). Cigarette control laws that regularly enforce civil penalties for tobacco sales violations can successfully reduce minors' access to cigarettes.     

Identity and injustice: Exploring women's participation in collective action

The present study is an investigation into the social psychological factors associated with women's reported participation in a range of different types of political action in the context of gender relations. At time 1,610 women were asked to rate their readiness to participate in various actions and to provide measures of social beliefs. Factor analysis extracted four types of action: participation in women's groups, collective protest, informal participation, and individual protest. One year later, at time 2, a subgroup of the same women were asked to say how much they had actually participated over the previous 12 months. Reported participation was related to gender identity, collective relative deprivation, efficacy, collectivist orientation, and identification as an activist. Regression analysis showed that identification as an activist was by far the most powerful correlate of participation, followed by gender identity; and that gender identity also played a role in moderating relationships between reported participation and other predictor variables. These findings show the important role of identity processes underlying participation in collective action and suggest the need to develop interaction models of participation.     

Attitudes, Intentions, and Behavior: A Study of Women's Participation in Collective Action

The present study tests the theories of reasoned action and planned behavior in the context of women's participation in collective action. Participants were 387 women who completed two questionnaires with an interval of 1 year. In the first questionnaire, participants were asked to provide measures of attitudinal, normative, and control factors, as well as measures of intention to participate in 4 group-related activities over the coming year. One year later in the second questionnaire, the same women provided measures of the degree to which they had actually participated in these behaviors during the course of the year. Findings showed strong relationships between attitudinal factors and intentions, and between intentions and behavior. The addition of perceived behavioral control, as specified by the theory of planned behavior, made little difference in regression analyses. Further analyses focused on the mediating role of identification as an activist. This revealed that attitudinal considerations were only important in the prediction of intention for those individuals with a weaker sense of themselves as activists. It is suggested that expectancy-value calculations may be less important in predicting the intentions of strongly committed individuals to engage in group-relevant acts.