Characterizing heterogeneity in children with and without ADHD based on reward system connectivity.

There was also a trend toward significance when comparing ADHD subgroups only for activity level scores ( F (3,38) = 3.152, p = 0.054); the ADHD-A subgroup displayed higher activity levels compared to the other ADHD subgroups ( Table 2 ). 4 Discussion Our understanding of the neurobiological underpinnings and etiology of ADHD will likely be limited without the proper characterization of the heterogeneity within the disorder.

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