“…Hence, a production which is auditorily perceived as either omission or category substitution may reveal, from the acoustic and/or 1 VOT is regarded as being the " […] interval between the articulatory opening of a plosive consonant and the start of vocal chords vibration." (KENT;READ, 1992, p.108). articulatory analysis, that the speaker is systematically producing differences to distinguish two phonemes (MACKEN;BARTON, 1980;SCOBBIE, 1998;HEWLETT;WATERS, 2004;BERTI, 2006;FREITAS, 2007;RODRIGUES, 2007;BERTI, 2010;MELO et al, 2011;BRASIL et al, 2012). Scobbie (1998) performed an extensive bibliographic survey of all the authors who described the presence of the covert contrast, both among children with typical development and among children with a phonological disorder.…”