> The study uncovered 254 genetic variants associated with volume in various subcortical regions, the authors report, accounting for as much as 10 percent of observed differences in volume among study participants.<p>> It was "the largest GWAS meta-analysis of intracranial and subcortical brain volumes to date," the researchers write, yielding insights about the genetic underpinnings of brain-volume variations and corresponding disorders.<p>> The study notably found genetic correlations for eight subcortical brain volumes with Parkinson's disease and three with ADHD.<p>Genes "accounting for as much as 10 percent". Some of which then have "correlations" with Parkinson's and ADHD. That sounds like good, honest basic science. Though with close to 75K subjects and 200 researchers in 20 countries - keeping their data quality high enough for such low-strength signals to be meaningful could be an absolute nightmare.