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The population of early implanted deaf infants is increasing substantially because of broadening candidacy criteria and because hearing loss can be detected in the first months of the newborn’s life due to advanced hearing diagnostic and screening techniques (Joint Committee on Infant Hearing, 2000; Yoshinaga-Itano, 2000). Furthermore, the trend to detect and identify hearing loss and to intervene at younger ages is driven by what used to be a general belief and now substantiated by considerable data showing that the earlier in development a child has access to hearing, the better the chances that he or she will acquire spoken language skills that are comparable to normal hearing peers (Miyamoto, Kirk, Svirsky, & Seghal, 1999; Svirsky, Teoh, & Neuburger, 2004; Yoshinaga-Itano, Sedey, Coulter, & Mehl, 1998). Specifically, early auditory habilitation, younger than 6 months of age, was found important for the later development of speech, language and scholastic achievements in young hearing-impaired (HI) children (eg, Fryauf-Bertschy, Tyler, Kelsay, & Gantz, 1997; Kirk, Miyamoto, Lento, Ying, O’Neill, & Fears 2002; Waltzman & Cohen, 1998). On this background, assessing auditory perception skills in HI infants for diagnosis