„There are large socioeconomic disparities in children‘s WM skills (Anm.: Working Memory skills), such that children from lower-socioeconomic-status households have lower WM than their more advantaged peers.“
Dr. Jenna E. Finch, Do Schools Promote Executive Functions? Differential Working Memory Growth Across School-Year and Summer Months. In: AERA Open, April-June 2019, Vol. 5, No. 2, S. 1.