“…To date, the research on the effect of PHS has mostly focused on inhibiting/cancelling cognitive effects (Barrios, 2001; Déry et al, 2014; Lifshitz et al, 2013; Oakley, & Halligan, 2009) and little is known about the ability of PHS to enhance cognition. This is essentially due to mixed early results (Barabasz, 1980; Gladfelter & Crasilneck, 1960; Hammer, 1954; Sakata & Anderson, 1970; Salzberg, & Depiano, 1980) coupled with some methodological issues (Barber, 1965; Jacobs & Salzberg, 1987). However, recent studies appear to be more promising for the potential use of PHS to enhance cognition, thus calling for further exploration of this issue (Appel, 1992; Carvalho, Mazzoni, Kirsch, Meo, & Santandrea,, 2008; Cohen Kadosh, Henik, Catena, Walsh, & Fuentes, 2009; Iani et al, 2006; 2009; Lifshitz et al, 2013).…”