The article:<p>"The researchers also found some differences between family groups, suggesting that some of the decline might be due to environmental factors. But they also suggest that lifestyle changes could account for some of the decline, as well, such as changes in the education system and children reading less and playing video games more. Sadly, other researchers have found similar results."<p>The paper:<p>"we show that the observed Flynn effect, its turning point, and subsequent decline can all be fully recovered from within-family variation. The analysis controls for all factors shared by siblings and finds no evidence for prominent causal hypotheses of the decline implicating genes and environmental factors that vary between, but not within, families."<p>Is this bad reporting or am I mis-understanding the conclusion of the authors?<p>EDIT: I think I was misunderstanding the conclusion of the authors. They believe they have shown that environmental factors are the main cause (from skimming the full paper's discussion).