To get an idea of how serious this omission is to the validity of the conclusions, take a look at "Individual differences in executive functions are almost enti

To get an idea of how serious this omission is to the validity of the conclusions, take a look at "Individual differences in executive functions are almost entirely genetic in origin" https://pubmed.ncbi.nlm.nih.gov/18473654/ https://pubmed.ncbi.nlm.nih.gov/18473654/