Infrequent, but not frequent, reinforcers produce more variable responding and deficient sustained attention in young children with attention-deficit/hyperactivity disorder (ADHD)

Article Abstract:

The influence of reinforcement frequency on operationalized measures of hyperactivity, impulsiveness, sustained attention and response variability was analyzed from the dynamic developmental theory of attention deficit/hyperactivity disorder (ADHD). The results provided support for the dynamic developmental theory of ADHD, predicting relationships between neurobiological deficits, altered reinforcement mechanisms and treatment recommendations.

Norway, Care and treatment, Attention-deficit hyperactivity disorder, Hyperactive children

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Bivariate linkage scan for reading disability and attention-deficit/hyperactivity disorder localizes pleiotropic loci

Article Abstract:

The established genetic correlation between reading disability (RD) and attention-deficit/hyperactivity disorder suggests that their comorbidity is due at least in part to genes that have an impact on several phenotypes, a phenomenon known as pleiotropy. A bivariate linkage test employed for selected samples to help identifying these pleiotropic loci highlights the utility of the linkage method to study pleitropy.

Research, United States, Genetic aspects, Comorbidity, Reading disorders, Pleiotropy

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