“…Unfortunately, their method of determining heading incidence was based on subject recall, a method prone to recall bias (Coughlin, 1990). In fact, in most previous reports examining the chronic neuropsychological effects in soccer players, the method of heading exposure was based on self-report or opinion (Abreau, Templer, Schuyler, & Hutchison, 1990;Matser, Kessels, Jordan, Lezak, & Troost, 1998;Matser et al, 1999;Matser, Kessels, Lezak, & Troost, 2001;Tysvaer & Lochen, 1991). We argue that unless a more accurate account of heading exposures is used, it will remain unclear whether or not soccer heading is detrimental in either the short or long term.…”