Lynn [Lynn, R., 2002. Sex differences on the progressive matrices among 15-16 year olds: some data from South Africa. "Personality and Individual Differences 33," 669-673.] proposed that biologically based developmental sex differences produce different IQ trajectories across childhood and adolescence. To test this theory we analyzed the…

This study was conducted to determine whether children who are deaf perform similarly to hearing children on the Universal Nonverbal Intelligence Test (UNIT; Bracken & McCallum, 1998). The children classified as deaf demonstrated a hearing loss of 60 dB or more, were prelingually deaf, and did not exhibit co-morbidity. They were matched on…

Used nonverbal serial reaction time paradigm to evaluate 7- to 11-year-olds' motor sequence learning in relation to reading, cognitive ability level, and attention problems. Found that children demonstrated the response profile associated with motor sequence learning, but the profile component indicating implicit sequence learning was not reliably…

Results of the Test of Nonverbal Intelligence (TONI), Wechsler Intelligence Scale for Children-Revised (WISC-R), and Wide Range Achievement Test were compared for 66 learning disabled children in grades one through six. The TONI mean score was found to be significantly different from the WISC-R Performance Intelligence Quotient (IQ). Implications…

Three different analyses have shown that the more information available in a nonverbal decoding task, the less efficiently younger subjects utilize the information relative to older ones. This differential effectiveness in the utilization of available information was discussed in terms of processing capacity, effort, and strategies for sampling a…

Specific language impairment is sometimes thought to be associated with concurrent difficulties in the area of social and behavioral development (N. Bolting & G. Conti-Ramsden, 2000; D. P. Cantwell & L. Baker, 1987; M. Fujiki, B. Brinton, & C. Todd, 1996; S. Redmond & M. Rice, 1998). The present study follows a group of 242…

Administration of nonverbal IQ tests to 12 children with normal language and 12 with language impairments (ages 8-10) revealed that the children with language impairments had lower scores than controls, and that nonlinguistic deficits of children with language impairments adversely affected their responses to specific types of items on nonverbal…

The Autism Diagnostic Interview was used to assess the difference between a group of 21 males and 21 females (ages 6-36) with autism with equivalent chronological nonverbal intelligence quotients greater than 60. Males were rated more severely autistic than females on several measures of early social development but not in other areas such as…

Presents syndrome of nonverbal learning disabilities (NLD) and model developed to encompass its complex manifestations. Includes history of development of syndrome, types of children in whom its principal features are manifest, hypothesized neurological bases of syndrome, and test of its developmental dimensions. Provides case study and discusses…

The standardization samples for the American Wechsler Intelligence Scale for Children-Revised (WISC-R) (n=2,200) and the French WISC-R (n=1,066) were used to compare the intelligence of French and U.S. children. The American sample scored higher on verbal IQ, full scale IQ, and some subtests. Implications of results are discussed. (SLD)

While sequencing of speaking turns occurs in both adult and child systems, the adult system is elaborated by nonverbal signaling of speaker/listener roles and is constrained by expectations of speaking turns responsive to a shared topic. Children's speaking turns are not accompanied regularly by nonverbal signals; the speaker role does not require…

Compared nonhandicapped (NH), educationally disadvantaged (ED), and learning disabled (LD) Navajo children on intellectual dimensions measured by the WISC-R. The ED and LD group means were similar on verbal measures, but the LD group scores were lower than ED group scores on performance measures. (Author/RC)

Examined neuropsychological functioning of survivors of acute lymphoblastic leukemia who underwent central-nervous-system prophylactic treatment. Findings replicated past research in showing survivors perform poorly on visual-motor integration tasks and develop a Nonverbal Learning Disability. Findings offer recommendations for future research and…

Examined the relationships among two psychometric measures of nonverbal cognitive ability - The Wechsler Intelligence Scale for Children-Revised (WISC-R) and the Woodcock-Johnson Psychoeducational Battery-Tests of Cognitive Ability (WJPB-TCA) and a neuropsychological test of abstract reasoning and concept formation (Halstead Category Test) in 25…

This longitudinal study examined the hypothesis that two different types of joint-attention skills were related to verbal and nonverbal IQ measures through middle childhood. Subjects were infants born preterm and tested at 13 months and at 8 years. Findings provide support for the hypothesis that the initiation of joint attention makes a unique…