a distinct disorder has been queried, especially by speech-language pathologists and psychologists, who note the overlap between clinical profiles of children diagnosed with APD and those with other forms of specific learning disability. Many audiologists, however, would dispute that APD is just an alternative label for dyslexia, SLI, or ADHD, noting that although it often co-occurs with these conditions, it can be found in isolation. Subcategories Based on sensitized measures of auditory dysfunction and on psychological assessment, patients can be subdivided into seven subcategories: middle ear dysfunction mild cochlear pathology central/medial olivocochlear efferent system (MOCS) auditory dysfunction purely psychological problems multiple auditory pathologies combined auditory dysfunction and psychological problems unknown Different subgroups may represent different pathogenic and aetiological factors. Thus, subcategorization provides further understanding of the basis of auditory processing disorder, and hence may guide the rehabilitative management of these patients. This was suggested by Professor Dafydd Stephens and F Zhao at the Welsh Hearing Institute, Cardiff University. Treatment Treatment of APD typically focuses on three primary areas: changing learning environment, developing higher-order skills to compensate for the disorder, and remediation of the auditory deficit itself. However, there is a lack of well-conducted evaluations of intervention using randomized controlled trial methodology. Most evidence for effectiveness adopts weaker standards of evidence, such as showing that performance improves after training. This does not control for possible influences of practice, maturation, or placebo effects. Recent research has shown that practice with basic auditory processing tasks (i.e. auditory training) may improve performance on auditory processing measures and phonemic awareness measures. Changes after auditory training have also been recorded at the physiological level. Many of these tasks are incorporated into computer-based auditory training programs such as Earobics and Fast ForWord, an adaptive software available at home and in clinics worldwide, but overall, evidence for effectiveness of these computerised interventions in improving language and literacy is not impressive. One small-scale uncontrolled study reported successful outcomes for children with APD using auditory training software. Treating additional issues related to APD can result in success. For example, treatment for phonological disorders (difficulty in speech) can result in success in terms of both the phonological disorder as well as APD. In one study, speech therapy improved auditory evoked potentials (a measure of brain activity in the auditory portions of the brain). While there is evidence that language training is effective for improving APD, there is no current research supporting