“…In the last 10 years, many studies have improved TMT normative data stratifying norms according to different demographic variables such as age, education, or gender (Heaton, Miller, Taylor, & Grant, 2004;Mitrushina, Boone, Razani, & D'Elia, 2005;Strauss, Sherman, & Spreen, 2006). For instance, norms exist for North American (Drane, Yuseph, Huthwaite, & Klingler, 2002;Steinberg, Bieliauskas, Smith, & Ivnik, 2005), Canadian (Tombaugh, 2004), Australian (Hester, Kinsella, Ong, & McGregor, 2005), Italian (Giovagnoli et al, 1996), Chinese (Lu & Bigler, 2002), Japanese (Hashimoto et al, 2006), Greek (Zalonis et al, 2010), Indian (Bhatia et al, 2007), and Korean healthy populations (Seo et al, 2006).…”