“…Mismatch negativity (MMN) and its magnetic counterpart (MMNm) are useful electrophysiological markers to evaluate the integrity of automatic central auditory processing (Hsiao, Cheng, Liao, & Lin, 2010;Kujala, Tervaniemi, & Schroger, 2007;Naatanen et al, 2011;Yabe et al, 2004). A number of studies have reported a lower amplitude of MMN/MMNm in response to pure-tone stimuli in aged adults (Alain, McDonald, Ostroff, & Schneider, 2004;Cheng, Baillet, Hsiao, & Lin, 2013;Cheng, Hsu, & Lin, 2013;Cheng, Wang, Hsu, & Lin, 2012;Cooper, Todd, McGill, & Michie, 2006;Czigler, Csibra, & Csontos, 1992;Kiang, Braff, Sprock, & Light, 2009), while to our knowledge, little is known about the effects of aging on the early cortical processes of phonetic discrimination.…”