Independence of the amount and delay ratios in the generalized matching law

Eight pigeons chose between pairs of different sizes and delays of reinforcement scheduled according to nonindependent concurrent variable-interval variable-interval schedules. The results were best described by the generalized matching law, where the relative effects of amount and delay on preference are independent and multiplicative. Order of presentation of the conditions had a significant effect on preference that was best represented in the model by a modification of the bias parameter.     

Child sexual and physical abuse among college students in Singapore and the United States

OBJECTIVES: The purpose of this study was to explore differences in rates and characteristics of child sexual and physical abuse experiences among women in Singapore and the US. METHOD: Participants (N=153) completed an anonymous questionnaire which assessed experiences of childhood sexual and physical abuse, abuse characteristics (e.g., victimization age, severity), and behavioral and subjective reactions to such experiences (e.g., labeling of experiences as abuse, psychological symptomatology). Exposure to other forms of traumatic life events was also assessed. RESULTS: In comparison to Singaporean women, US women were more likely to report a history of child sexual abuse, and to report experiencing more severe forms of sexual abuse. Women in Singapore were more likely than women in the US to report a history of child physical abuse, to report experiencing injury as a result of the abuse, and to disclose the abuse. Singaporean women with a history of child sexual abuse reported elevated psychological symptom levels relative to their nonabused peers and to US women with a history of child sexual abuse, even after controlling for exposure to other types of traumatic events. No significant differences in symptomatology with regard to child physical abuse were observed. CONCLUSIONS: Although preliminary in nature, the present findings are among the first to demonstrate differences in psychological adjustment between sexually abused and nonabused Asian women living in Asia. This study also provides some of the first support for cross-national differences in the psychological adjustment of child sexual abuse survivors.     

Unpicking the Developmental Relationship Between Oral Language Skills and Reading Comprehension: It's Simple,But Complex

Listening comprehension and word decoding are the two major determinants of the development of reading comprehension. The relative importance of different language skills for the development of listening and reading comprehension remains unclear. In this 5‐year longitudinal study, starting at age 7.5 years (n = 198), it was found that the shared variance between vocabulary, grammar, verbal working memory, and inference skills was a powerful longitudinal predictor of variations in both listening and reading comprehension. In line with the simple view of reading, listening comprehension, and word decoding, together with their interaction and curvilinear effects, explains almost all (96%) variation in early reading comprehension skills. Additionally, listening comprehension was a predictor of both the early and later growth of reading comprehension skills.     

Parental Socioeconomic Status,Communication, and Children's Vocabulary Development: A Third‐Generation Test of the Family Investment Model

This third‐generation, longitudinal study evaluated a family investment perspective on family socioeconomic status (SES), parental investments in children, and child development. The theoretical framework was tested for first‐generation parents (G1), their children (G2), and the children of the second generation (G3). G1 SES was expected to predict clear and responsive parental communication. Parental investments were expected to predict educational attainment and parenting for G2 and vocabulary development for G3. For the 139 families in the study, data were collected when G2 were adolescents and early adults and their oldest biological child (G3) was 3–4 years of age. The results demonstrate the importance of SES and parental investments for the development of children and adolescents across multiple generations.     

The Relative Predictive Contribution and Causal Role of Phoneme Awareness,Rhyme Awareness,and Verbal Short-Term Memory in Reading Skills: A Review

The acknowledgement that educational achievement is highly dependent on successful reading development has led to extensive research on its underlying factors. A strong argument has been made for a causal relationship between reading and phoneme awareness; similarly, causal relations have been suggested for reading with short-term memory and rhyme awareness alike. Here a meta-analysis is presented that seeks to determine spuriousness in these factors' relationships with reading by examining each factor's unique predictive value. The results show that phoneme awareness is the strongest unique predictor. Since the meta-analysis is based on concurrent data, it is unsuited to enlighten time-order relationships, but longitudinal and experimental studies both support the notion of a causal relationship between phoneme awareness and reading, in contrast to rhyme awareness and verbal short-term memory.     

Predicting Physical Activity Among Children: Investigating Interaction Effects in the Theory of Planned Behavior

ABSTRACT

Purpose: The theory of planned behavior (TPB) has been criticized for not including interactions between the variables assumed to predict behavior. This study sought to test how TPB variables interact to predict physical activity (PA) in children. Method: Four hundred thirty-eight children (M_age = 8.6 years, SD = 1.6 years) completed a TPB questionnaire and a PA questionnaire at Time 1. The PA measure was repeated 2 months later. Path analyses were performed to test the hypothesized model including interaction terms between TPB variables. Simple slopes analyses were also carried out to examine the statistically significant interaction terms. Results: Path analyses confirmed the classical hypotheses of TPB (R² for intentions = .39, R² for PA = .12) and also demonstrated only statistically significant Attitudes × Perceived Behavioral Control and Subjective Norms × Attitudes interactions (R² change for intentions = .01, p = .009). Simple slopes analyses revealed that the strength of the association between perceived behavioral control and intentions was only statistically significantly higher (t = 2.18, p = .05, d = 0.34, 95% CI [0.03, 0.65]) when attitudes were high compared with when attitudes were low. The link between attitudes and intentions was only statistically significant at a low level of subjective norms but not at a high level. Conclusion: The integration of interaction effects between TPB variables did not increase for the variance of PA explained by the model. More research appears to be necessary to explore how the TPB could be augmented to better predict PA in children.     

Spelling! Developing a Good Foundation

This articie is a brief response to an article on spelling by David Waugh which appeared in Vol. 29(2). The authors argue that the Letterland system can be of great benefit in approaching spelling.     

Antenatal prediction of mother-infant difficulties

A prospective study of 143 "low risk" pregnant women expecting their first baby was conducted in Newcastle, Australia. The study was designed to examine the contribution of a woman's perception of her own childhood experiences, her trait anxiety level, socioeconomic status, and social support network to difficulties in her relationship with her baby during the baby's first year. The women were initially interviewed during pregnancy and followed up 3 and 12 months postpartum. Follow-up measures included the Dimensions of Perinatal Adjustment, the Neonatal Perception Inventory, the Ainsworth Strange Situation, and information from hospital records, family doctors, and baby health centre sisters. Women who perceived their social network as less supportive during pregnancy were likely to see their one-year-old babies (p less than .05) as more difficult. The other antenatal measures were not significantly predictive of outcome.