Verb generation in children with spina bifida

Psycholinguistic and scholastic abilities in children with myelomeningocele

PURPOSE

To describe the performance of individuals with myelomeningocele regarding psycholinguistic and scholastic abilities.

METHODS

Participants were five individuals with myelomeningocele and lumbar sacral abnormalities, and chronological age between 9 years and 10 months and 11 years and 7 months (Group 1 - G1); five subjects with typical development (Group 2 - G2), matched to G1 for age, gender, and educational level. The evaluation consisted of interview with parents/caregivers, and application of the following tests: Illinois Test of Psycholinguistic Abilities (ITPA); School Performance Test; Speed Reading Test; and Rapid Automatized Naming Test.

RESULTS

The between-groups comparison in the ITPA subtests showed that the maximum values obtained by G1 corresponded approximately to the minimum values obtained by G2, confirming the difference between the groups, except for the auditory closure subtest. In the Scholastic Performance Test, significant alterations were observed on the performance of G1 in all tasks. In the Speed Reading and Rapid Automatized Naming tests, individuals in G1 also presented considerable deficits, making more mistakes and spending more time than G2 to perform the same tasks.

CONCLUSION

Individuals with myelomeningocele present deficits in psycholinguistic abilities, school performance, reading speed, and rapid automatized naming.

Desempenho psicolinguístico e escolar de irmãos com mielomeningocele

TEMA: mielomeningocele e consequências para o desenvolvimento de habilidades psicolinguísticas e escolares. PROCEDIMENTOS: o objetivo deste estudo foi descrever e refletir sobre o desempenho psicolinguístico e escolar de irmãos com mielomeningocele lombar baixa. Participaram do estudo um menino de 14 anos e 5 meses (P1) e sua irmã de 6 anos e 6 meses (P2). Os procedimentos constaram de entrevista com familiares, Observação do Comportamento Comunicativo (OCC), Teste de Vocabulário por Imagens Peabody - TVIP, Teste Illinóis de Habilidades Psicolinguísticas (ITPA), Perfil de Habilidades Fonológicas (PHF), Teste de Desempenho Escolar (TDE), e Reconhecimento de letras e números (RLN). A análise dos resultados foi descritiva respeitando os manuais dos instrumentos. RESULTADOS: a linguagem oral encontra-se sem alteração evidente. No ITPA e PHF, verificou-se que P1 e P2 apresentaram dificuldade nas habilidades de memória, closura auditiva, expressão verbal, combinação de sons e consciência fonológica. P1 ainda apresentou dificuldade na habilidade de recepção visual e P2 nas habilidades de associação auditiva e closura gramatical. Ambas as crianças apresentaram alteração nas atividades de aprendizagem. CONCLUSÃO: os participantes do estudo apresentaram comportamento comunicativo, habilidades de linguagem oral e vocabulário receptivo sem alterações evidentes. P1 e P2 apresentaram alterações nas habilidades psicolinguísticas bem como no desempenho de atividades envolvendo leitura, escrita e aritmética. As dificuldades apresentadas causam impacto importante nas atividades acadêmicas, demonstrando vulnerabilidade cerebral no sistema de suporte para atividade de aprendizagem.

Cerebellar motor function in spina bifida meningomyelocele

Spina bifida meningomyelocele (SBM), a congenital neurodevelopmental disorder, involves dysmorphology of the cerebellum, and its most obvious manifestations are motor deficits. This paper reviews cerebellar neuropathology and motor function across several motor systems well studied in SBM in relation to current models of cerebellar motor and timing function. Children and adults with SBM have widespread motor deficits in trunk, upper limbs, eyes, and speech articulators that are broadly congruent with those observed in adults with cerebellar lesions. The structure and function of the cerebellum are correlated with a range of motor functions. While motor learning is generally preserved in SBM, those motor functions requiring predictive signals and precise calibration of the temporal features of movement are impaired, resulting in deficits in smooth movement coordination as well as in the classical cerebellar triad of dysmetria, ataxia, and dysarthria. That motor function in individuals with SBM is disordered in a manner phenotypically similar to that in adult cerebellar lesions, and appears to involve similar deficits in predictive cerebellar motor control, suggests that age-based cerebellar motor plasticity is limited in individuals with this neurodevelopmental disorder.

The cognitive phenotype of spina bifida meningomyelocele

A cognitive phenotype is a product of both assets and deficits that specifies what individuals with spina bifida meningomyelocele (SBM) can and cannot do and why they can or cannot do it. In this article, we review the cognitive phenotype of SBM and describe the processing assets and deficits that cut within and across content domains, sensory modality, and material, including studies from our laboratory and other investigations. We discuss some implications of the SBM cognitive phenotype for assessment, rehabilitation, and research.

Characteristics of a spina bifida population including North American Caucasian and Hispanic individuals

BACKGROUND

Meningomyelocele (MM) is a common human birth defect. MM is a disorder of neural development caused by contributions from genes and environmental factors that result in the NTD and lead to a spectrum of physical and neurocognitive phenotypes.

METHODS

A multidisciplinary approach has been taken to develop a comprehensive understanding of MM through collaborative efforts from investigators specializing in genetics, development, brain imaging, and neurocognitive outcome. Patients have been recruited from five different sites: Houston and the Texas-Mexico border area; Toronto, Canada; Los Angeles, California; and Lexington, Kentucky. Genetic risk factors for MM have been assessed by genotyping and association testing using the transmission disequilibrium test.

RESULTS

A total of 509 affected child/parent trios and 309 affected child/parent duos have been enrolled to date for genetic association studies. Subsets of the patients have also been enrolled for studies assessing development, brain imaging, and neurocognitive outcomes. The study recruited two major ethnic groups, with 45.9% Hispanics of Mexican descent and 36.2% North American Caucasians of European descent. The remaining patients are African-American, South and Central American, Native American, and Asian. Studies of this group of patients have already discovered distinct corpus callosum morphology and neurocognitive deficits that associate with MM. We have identified maternal MTHFR 667T allele as a risk factor for MM. In addition, we also found that several genes for glucose transport and metabolism are potential risk factors for MM.

CONCLUSIONS

The enrolled patient population provides a valuable resource for elucidating the disease characteristics and mechanisms for MM development.