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Using a new nationally representative dataset, we find minor differences in test outcomes between black and white infants that disappear with a limited set of controls. However, relative to whites, all other races lose substantial ground by age two. Combining our estimates with results in prior literature, we show that a simple model with assortative mating fits our data well, implying that differences in children's environments between racial groups can fully explain gaps in intelligence. If parental ability influences a child's test scores both genetically and through environment, then our findings are less informative and can be reconciled with a wide range of racial differences in inherited intelligence.

Language acquisition research in autism has traditionally focused on high-level pragmatic deficits. Few studies have examined grammatical abilities in autism, with mixed findings. The present study addresses this gap in the literature by providing a detailed investigation of syntactic and higher-level discourse abilities in verbal children with autism, age 5 years. Findings indicate clear language difficulties that go beyond what would be expected based on developmental level; specifically, syntactic delays, impairments in discourse management and increased production of non-meaningful words (jargon). The present study indicates a highly specific pattern of language impairments, and importantly, syntactic delays, in a group of children with autism carefully matched on lexical level and non-verbal mental age with children with developmental delays and typical development.

BACKGROUND: The long-term neurotoxicity risks caused by prenatal exposures to pesticides are unclear, but a previous pilot study of Ecuadorian school children suggested that blood pressure and visuospatial processing may be vulnerable. OBJECTIVES: In northern Ecuador, where floriculture is intensive and relies on female employment, we carried out an intensive cross-sectional study to assess children's neurobehavioral functions at 6-8 years of age. METHODS: We examined all 87 children attending two grades in the local public school with an expanded battery of neurobehavioral tests. Information on pesticide exposure during the index pregnancy was obtained from maternal interview. The children's current pesticide exposure was assessed from the urinary excretion of organophosphate metabolites and erythrocyte acetylcholine esterase activity. RESULTS: Of 84 eligible participants, 35 were exposed to pesticides during pregnancy via maternal occupational exposure, and 23 had indirect exposure from paternal work. Twenty-two children had detectable current exposure irrespective of their prenatal exposure status. Only children with prenatal exposure from maternal greenhouse work showed consistent deficits after covariate adjustment, which included stunting and socioeconomic variables. Exposure-related deficits were the strongest for motor speed (Finger Tapping Task), motor coordination (Santa Ana Form Board), visuospatial performance (Stanford-Binet Copying Test), and visual memory (Stanford-Binet Copying Recall Test). These associations corresponded to a developmental delay of 1.5-2 years. Prenatal pesticide exposure was also significantly associated with an average increase of 3.6 mmHg in systolic blood pressure and a slight decrease in body mass index of 1.1 kg/m2. Inclusion of the pilot data strengthened these results. CONCLUSIONS: These findings support the notion that prenatal exposure to pesticides—at levels not producing adverse health outcomes in the mother—can cause lasting adverse effects on brain development in children. Pesticide exposure therefore may contribute to a \"silent pandemic\" of developmental neurotoxicity.

Background Advances in paediatric critical care have resulted in a reduction in mortality. This has shifted the focus to paediatric intensive care unit (PICU)-related morbidities and how to reduce or prevent them. In this study, we aimed to study the impact of paediatric intensive care unit (PICU) admission on neurocognitive performance. Methods Intelligence quotient (IQ) was tested in 50 children (27 boys, 23 girls; mean age 6.98 years) 3 months after PICU discharge and in 75 controls using the Stanford-Binet IQ test. Results There was no statistically significant difference between patients and controls with regard to IQ scores, and no difference between medical and surgical patients ( p > 0.05). IQ was unaffected by sedation, blood transfusion, or blood product transfusion. Patients who underwent a major surgical procedure, needed inotropic support, and needed mechanical ventilation had non-significantly lower IQ scores than those who did not. A non-significant negative correlation was observed between the length of PICU stay, mechanical ventilation duration, sedative use, and inotropic support. Conclusions PICU admission does not appear to significantly affect cognitive outcomes in paediatric survivors.

Nonverbal IQs were greater than verbal IQs for children (ages 3-7) on the Stanford-Binet: IV (n=53). However, WISC-III verbal and nonverbal IQs were similar for older children, 6-15 years of age (n=63). Stanford-Binet: IV profiles were generally consistent for the low-IQ and high-IQ groups with high scores on visual matching tests. (Contains references.) (Author/CR)

The Fifth Edition of the Stanford–Binet Intelligence Scales (SB5; Roid, G. H. ( 2003 ). Stanford Binet intelligence scales (5th ed.). Itasca, IL: Riverside Publishing) is relatively new, with minimal published research on general populations and none with special populations. The present study provides information on the cognitive profiles of children with ASD ( N  = 63) and on the whether the abbreviated battery is representative of the full scale. A high percentage of the children had significantly stronger nonverbal (vs. verbal) skills. This pattern was not related to Full Scale IQ, age or diagnostic subgroup. IQs derived from the abbreviated battery accounted for a large proportion of the variance in FSIQ relative to comparable abbreviated batteries. However, caution is warranted when using the abbreviated battery, as it misrepresents actual ability in a small percentage of cases.

A review of hospital records was conducted for children evaluated for autism spectrum disorders who completed both the Leiter International Performance Scale—Revised (Leiter-R) and Stanford-Binet Intelligence Scales, 5th Edition (SB5). Participants were between 3 and 12 years of age. Diagnoses were autistic disorder (n = 26, 55%) and pervasive developmental disorder–not otherwise specified (n = 21, 45%). Analysis showed that the full sample received significantly higher scores on the Leiter-R than SB5 (mean discrepancy of 20.91 points), specific diagnosis was not a significant factor, and younger children had a larger discrepancy between tests. These analyses strongly suggest that the Leiter-R and the SB5 may not be equivalent measures of intellectual functioning in children with autism spectrum disorders, and that use of one or the other exclusively could lead to misclassification of intellectual capacity.

The predictive power of age and IQ at time of admission to an intensive behavioral treatment program for young children with autism were examined in a 4- to 6-year follow-up of educational placement. Results with 27 children showed that having a higher IQ at intake and being younger were both predictive of later placement in a regular education class. (Contains references.) (Author/DB)

It is often asserted that Black Americans have made no IQ gains on White Americans. Until recently, there have been no adequate data to measure trends in Black IQ. We analyzed data from nine standardization samples for four major tests of cognitive ability. These data suggest that Blacks gained 4 to 7 IQ points on non-Hispanic Whites between 1972 and 2002. Gains have been fairly uniform across the entire range of Black cognitive ability.

This study used meta-analytical techniques to explore the association between intelligence and age in children with Duchenne muscular dystrophy (DMD). The sample comprised 1224 children and young adults with DMD (mean age 12y 3mo, SD 4y; range 2y to 27y). Standardized measures including the Wechsler Intelligence Scales (WIS) and the Stanford-Binet Intelligence Scales were used to estimate intelligence. No age-related difference was noted for Full-scale and Performance intelligence quotients (IQ). However, Verbal IQ increased significantly with age. Age-related increases were noted for the WIS Information, Similarities, Arithmetic, Comprehension, Digit Span, Picture Arrangement, Block Design, and Coding subscales. These results support the notion that younger children with DMD have deficits in verbal reasoning and verbal processing. Older children with DMD, particularly those of 14 years and older, were less likely to present with these problems. Implications of these findings and possible future research directions are discussed.