Causal Heterogeneity in Attention-Deficit/Hyperactivity Disorder: Do We Need Neuropsychologically Impaired Subtypes?

@article{Nigg2005CausalHI,
  title={Causal Heterogeneity in Attention-Deficit/Hyperactivity Disorder: Do We Need Neuropsychologically Impaired Subtypes?},
  author={Joel T. Nigg and Erik G. Willcutt and Alysa E. Doyle and Edmund J S Sonuga-Barke},
  journal={Biological Psychiatry},
  year={2005},
  volume={57},
  pages={1224-1230}
}
Before assigning full etiologic validity to a psycopathologic disorder, disease theory suggests that a causal dysfunction in a mechanism within the affect individuals must be identified. Existing theories on attention-deficit/hyperactivity disorder (ADHD) suggest such dysfunctions in cognitive, neuropsychological, or motivational processes in the child. To date, researchers have tested these theories by comparing groups with DSM-defined ADHD to children without ADHD. Using executive functioning… 
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