RESUMO
The authors examined the neuropsychological status of 22 preschoolers at risk for attention-deficit/hyperactivity disorder (ADHD) and 50 matched control children, using measures of nonverbal working memory, perceptual and motor inhibition, and memory for relative time. All tasks included paired control conditions, which allowed for the isolation of discrete executive function constructs. Group differences were evident on several measures of neuropsychological functioning; however, after accounting for nonexecutive abilities, no deficits could be attributed to specific functions targeted by the tasks. Performance on executive measures was not related to objective indices of activity level or ratings of ADHD symptoms. Yet, the fact that at-risk preschoolers were highly symptomatic casts doubt on whether executive function deficits and/or frontostriatal networks contribute etiologically to early behavioral manifestations of ADHD.
Assuntos
Transtorno do Deficit de Atenção com Hiperatividade/fisiopatologia , Inibição Psicológica , Processos Mentais/fisiologia , Atividade Motora/fisiologia , Testes Neuropsicológicos/estatística & dados numéricos , Estudos de Casos e Controles , Pré-Escolar , Feminino , Humanos , Inteligência/fisiologia , Testes de Inteligência , Masculino , Memória de Curto Prazo/fisiologia , Percepção/fisiologia , Resolução de Problemas/fisiologia , Estatística como AssuntoRESUMO
OBJECTIVES: This study examined whether high levels of television viewing are associated with attention problems and hyperactivity in preschool children. METHODS: Parent and teacher ratings of inattention, hyperactivity and impulsivity, objectively measured activity level, and parental estimation of early television exposure were collected for a sample of preschool children. Separate linear regression analyses were conducted with parent and teacher behavioral ratings and objectively assessed activity level as outcome variables. RESULTS: Results indicated that after controlling for demographic factors (i.e., age, sex, and SES), television exposure accounted for a significant proportion of the variance in teacher ratings of inattentive/hyperactive behaviors, as well as objectively measured activity level. CONCLUSIONS: These findings partially replicate those from a recent, highly publicized study indicating a correlation between television exposure and attention-deficit/hyperactivity disorder (ADHD)-associated behaviors. However, it remains unclear as to whether elevated levels of television viewing are the cause or result of ADHD symptoms.