Numerical predictors of arithmetic success in grades 1–6

Math relies on mastery and integration of a wide range of simpler numerical processes and concepts. Recent work has identified several numerical competencies that predict variation in math ability. We examined the unique relations between eight basic numerical skills and early arithmetic ability in a large sample (N = 1391) of children across grades 1–6. In grades 1–2, children's ability to judge the relative magnitude of numerical symbols was most predictive of early arithmetic skills. The unique contribution of children's ability to assess ordinality in numerical symbols steadily increased across grades, overtaking all other predictors by grade 6. We found no evidence that children's ability to judge the relative magnitude of approximate, nonsymbolic numbers was uniquely predictive of arithmetic ability at any grade. Overall, symbolic number processing was more predictive of arithmetic ability than nonsymbolic number processing, though the relative importance of symbolic number ability appears to shift from cardinal to ordinal processing.     

Order and Strength Matter for Evaluation of Alibi and Eyewitness Evidence

We explored the effects of presentation order and evidence strength on participants acting as investigators in a criminal context. Participants evaluated evidence and suspect guilt in a study in which alibi witness and eyewitness evidence of varying strength, presented in different orders, were compared. In contrast to research on the confirmation bias, which suggests that evidence presented early distorts subsequent evaluations of evidence, the present findings suggest that under certain circumstances, evidence received most recently can have a greater impact on decision‐making. Recency effects were observed most frequently when recent evidence was particularly strong and often when it contradicted previously encountered strong evidence. The impact of recency extended beyond the impact of evidence and to evaluations of the credibility of individual pieces of evidence. Copyright © 2013 John Wiley & Sons, Ltd.     

Effects of Mothers' Overestimations and Underestimations of Their Children's Intellectual Ability: A Reanalysis of Hunt and Paraskevopoulos

Hunt and Paraskevopoulos reported (1980a) that mothers' tendency to overestimate their children's performances on intelligence-test items had a strongly negative correlation with children's intellectual ability, whereas their tendency to underestimate had a negligible correlation. Those findings were misleading side effects of the method used to measure mothers' tendencies to overestimate and underestimate. Appropriate alternative measures are suggested in the present article, and results that would have been obtained with them are approximated. According to this reanalysis, mothers' tendencies to both overestimate and underestimate have modest but significant negative correlations with children's intellectual ability. Mothers' tendency to make accurate estimations has a moderately strong positive correlation with children's intellectual ability.     

The Attraction of Africanized Honey Bees (Apis mellifera L.) to Soft Drinks and Perfumes

The attraction of Africanized bees to soft drinks and perfumes was investigated. In the first experiment, the ability of bees to discriminate between two perfumes (Realm for Men and Realm for Women) was assessed. The results indicated that the scents could be used as conditioned stimuli. In the second experiment, bees were divided into individual groups and confined to small metal tubes. Groups were fed either Diet Pepsi, spring water (control), Diet Guaraná, Diet Coca-Cola, Coca-Cola, Sprite, Pepsi, Guaraná, Sukita Orange, Fanta Orange, Fanta Grape, or sucrose (control). The dependent variable was the amount of time the bee's proboscis was in contact with a strip of filter paper saturated with the substance. The results indicated little or no contact with the diet soft drinks and spring water, 45–65 s of contact with Coca-Cola, Sprite, Pepsi, Guaraná, and Sukita Orange, and 75–140 s of contact with Fanta Orange, Fanta Grape, and sucrose (sucrose elicited the most contact of the substances tested). In a third experiment, the ability of bees to associate an odor with a soft drink was assessed in a discrimination task. With Citral and Geraniol as conditioned stimuli, conditioning was best to sucrose, Guaraná, and Fanta Orange. Little conditioning was observed with Pepsi, and no conditioning was observed with Diet Pepsi.     

Peer Leadership in Sport: Relationships among Personal Characteristics,Leader Behaviors,and Team Outcomes

Abstract

The present study comprised two meta-analyses of published studies that used the Profile of Mood States (POMS) to investigate relationships between mood and athletic achievement (n = 13) and between mood and performance outcome (n = 16). Results showed that effect sizes (ESs) for the level of achievement metaanalysis were minimal (Weighted Mean ES = .10, SD = .07), a finding consistent with a previous meta-analysis by Rowley, Landers, Kyllo, and Etnier (1995). Larger effects were found for the performance outcome meta-analysis (Weighted Mean ES = .31, SD = .12). Effects were moderate for vigor, confusion, and depression, small for anger and tension, and very small for fatigue. All effects were in the direction predicted by Morgan's (1985) Mental Health Model. Effects were larger in sports of short duration, in sports involving open skills, and where performance was judged using self-referenced criteria. Findings suggest that the POMS has utility in the prediction of performance outcome but not in the prediction of level of achievement.     

Children's memory for complex autobiographical events: Does spacing of repeated instances matter?

Often, when children testify in court they do so as victims of a repeated offence and must report details of an instance of the offence. One factor that may influence children's ability to succeed in this task concerns the temporal distance between presentations of the repeated event. Indeed, there is a substantial amount of literature on the “spacing effect” that suggests this may be the case. In the current research, we examined the effect of temporal spacing on memory reports for complex autobiographical events. Children participated in one or four play sessions presented at different intervals. Later, children were suggestively questioned, and then participated in a memory test. Superior recall of distributed events (a spacing effect) was found when the delay to test was 1?day (Experiment 1) but there was little evidence for a spacing effect when the delay was 1 week (Experiment 2). Implications for understanding children's recall of repeated autobiographical events are discussed.     

The limits of child effects: evidence for genetically mediated child effects on corporal punishment but not on physical maltreatment

Research on child effects has demonstrated that children's difficult and coercive behavior provokes harsh discipline from adults. Using a genetically sensitive design, the authors tested the limits of child effects on adult behavior that ranged from the normative (corporal punishment) to the nonnormative (physical maltreatment). The sample was a 1994-1995 nationally representative birth cohort of 1,116 twins and their families who participated in the Environmental Risk Longitudinal Study. Results showed that environmental factors accounted for most of the variation in corporal punishment and physical maltreatment. However, corporal punishment was genetically mediated in part, and the genetic factors that influenced corporal punishment were largely the same as those that influenced children's antisocial behavior, suggesting a child effect. The authors conclude that risk factors for maltreatment are less likely to reside within the child and more likely to reside in characteristics that differ between families.