Struc­tured sets of brain exer­cis­es designed to train spe­cif­ic brain areas and func­tions have been used by the mil­i­tary and by clin­i­cal neu­ropsy­chol­o­gists for a long time. What is hap­pen­ing now is that this approach is being repack­aged and com­mer­cial­ized for new and wider audiences. We define “brain train­ing soft­ware” as ful­ly-auto­mat­ed appli­ca­tions designed to…