Children with auditory processing disorders appear to be uncertain about what they hear, and may have difficulties listening in background noise, following oral instructions, and understanding rapid or degraded speech in the presence of normal peripheral hearing (Jerger & Musiek, 2000). Investigators have attempted to document the heterogeneous nature of (C) APDs by sub-grouping them or describing the characteristics in terms of commonalities (Musiek & Gollegly, 1988; Katz, 1992; Bellis & Ferre, 1999). Musiek & Gollegly (1988) report three types of (C)APD in children with learning disabilities.