Lovely study. The authors are wisely cautious in their interpretation—in fact, three paragraphs in discussion sre devoted to caveats, such as lack of longitudin

Lovely study. The authors are wisely cautious in their interpretation—in fact, three paragraphs in discussion sre devoted to caveats, such as lack of longitudinal data. Are effects due to secular changes or individual changes? Probably the latter, but given possible impact of rampant video gaming on quick decision making abilities, this is not a firm inference. Secular/epoch effects are very real—IQ scores included. What amazes me is the very wide range of variation in performance. Look at those large error bars throughout figure 2. Age or secular trends do not account for much of the variance in performance. Other variable do! Paper is open access.