The development of visual working memory capacity during early childhood

The change detection task has been used in dozens of studies with adults to measure visual working memory capacity. Two studies have recently tested children in this task, suggesting a gradual increase in capacity from 5 years to adulthood. These results contrast with findings from an infant looking paradigm suggesting that capacity reaches adult-like levels within the first year. The current study adapted the change detection task for use with children younger than 5 years to test whether the standard version of the task was too difficult and may have underestimated children's capacity. Results showed that 3- and 4-year-olds could successfully complete this modified task and that capacity increased roughly linearly, from 2 or 3 items during this period to 3 or 4 items between 5 and 7 years. Furthermore, performance did not differ significantly between the modified version and a replication of the standard version with 5- and 7-year-olds. Thus, there is no evidence that previous research with the change detection task underestimated children's capacity. Further research is needed to understand how performance relates across the infant looking task and change detection to provide a more complete picture of visual working memory capacity over development.     

Parasite-stress, cultures of honor, and the emergence of gender bias in purity norms

Of the many far-reaching implications of Fincher & Thornhill's (F&T's) theory, we focus on the consequences of parasite stress for mating strategies, marriage, and the differing roles and restrictions for men and women. In particular, we explain how examination of cultures of honor can provide a theoretical bridge between effects of parasite stress and disproportionate emphasis on female purity.     

Sex Differences in Religiosity: The Role of Attachment to Parents and Social Learning

We employed aspects of both attachment theory and social learning theory to develop an understanding of sex differences in young adults’ attachment to God, their concepts of God, and other aspects of their religiosity. We found that attachment to God is more likely to be associated with attachment to the same-sex parent than to the opposite-sex parent. We found that this is also true for concepts of God as loving, controlling, and distant in female, but not male participants in our study. For both males and females, mother’s level of religious involvement when they were growing up was associated with participants’ later attendance at religious services, but for males, attachment to father was an additional influence. In neither males nor females was attachment to either parent or their parent’s past religious involvement a significant predictor of strength of religious faith.     

Differential susceptibility and the early development of aggression: interactive effects of respiratory sinus arrhythmia and environmental quality

The purpose of the current study was to predict the development of aggressive behavior from young children's respiratory sinus arrhythmia (RSA) and environmental quality. In a longitudinal sample of 213 children, baseline RSA, RSA suppression in response to a film of crying babies, and a composite measure of environmental quality (incorporating socioeconomic status and marital adjustment) were measured, and parent-reported aggression was assessed from 18 to 54 months of age. Predictions based on biological sensitivity-to-context/differential susceptibility and diathesis-stress models, as well as potential moderation by child sex, were examined. The interaction of baseline RSA with environmental quality predicted the development (slope) and 54-month intercept of mothers' reports of aggression. For girls only, the interaction between baseline RSA and environmental quality predicted the 18-month intercept of fathers' reports. In general, significant negative relations between RSA and aggression were found primarily at high levels of environmental quality. In addition, we found a significant Sex × RSA interaction predicting the slope and 54-month intercept of fathers' reports of aggression, such that RSA was negatively related to aggression for boys but not for girls. Contrary to predictions, no significant main effects or interactions were found for RSA suppression. The results provide mixed but not full support for differential susceptibility theory and provide little support for the diathesis-stress model.     

Observed reach trajectory influences executed reach kinematics in prehension

Previous studies have demonstrated that the observation of action can modulate motor performance. This literature has focused on manipulating the observed goal of the action, rather than examining whether action observation effects could be elicited by changing observed kinematics alone. In the study presented here, observed reach trajectory kinematics unrelated to the goal of the action were manipulated in order to examine whether observed movement kinematics alone could influence the action of the observer. Participants observed an experimenter grasp a target object using either a normal or an exaggeratedly high reaching action (as though reaching over an invisible obstacle). When participants observed the experimenter perform actions with a high reach trajectory, their own movements took on aspects of the observed action, showing greater wrist height throughout their reaching trajectory than under conditions in which they observed normal reaching actions. The data are discussed in relation to previous findings which suggest that kinematic aspects of observed movements can prime action through kinematic or intention based matching processes.     

Symptoms of depression and related factors among Spanish university students

A 554-member stratified random sample of students at a Spanish university (65.9% women; aged 18-34 years) was screened for symptoms of depression using a new Castilian Spanish translation of the Center for Epidemiologic Studies Depression Scale (CES-D) that had been validated by back-translation. Mean CES-D score was 14.2 (SD = 10.3, range 0-54), with a significant difference between the scores of women (M = 15.5; SD = 10.9) and men (M = 11.8; SD = 8.4; t552 = 4.06, p < .0005). Some 33%, of the sample screened positive with the usual CES-D screening threshold of 16, and 16% with the threshold of 24 recommended by Clarke and coworkers. The symptoms most commonly experienced all or most of the time were hopelessness, given the maximum rating by 18.8% of students, difficulty in concentration (17.7%), fatigue (13.9%), inadequacy (13.0%), and disturbance of sleep (12.4%).     

Ethical issues in genetic counseling: A comparison of M.S. counselor and medical geneticist perspectives

New technologies available in the field of medical genetics have increased the importance of responsible ethical decision-making among genetic counselors. A 1985 national survey of M.D. and Ph.D. genetic counselors assessed ethical attitudes using case scenarios designed to simulate dilemmas faced in genetic counseling (Wertz and Fletcher, 1988b). The current study focuses on attitudes of M.S. genetic counselors using similar scenarios, allowing for effective comparisons. M.S. counselors were more willing than M.D. and Ph.D. counselors to maintain patient confidentiality when screening for Huntington's Disease and occupational diseases, and a greater number would agree to counsel patients pursuing prenatal testing for sex selection. A majority of M.S. counselors would disclose an XY karyotype to a phenotypically female patient. M.S. counselors reasoned that respect for patient autonomy and patient confidentiality justified their decisions in many cases. The importance of these principles is discussed and questioned.