PURPOSE: The purpose of this review article is to describe characteristics of auditory processing disorders (APD) by evaluating the literature in which children with suspected or diagnosed APD were compared with typically developing children and to determine whether APD must be regarded as a deficit specific to the auditory modality or as a multimodal deficit.METHOD: Six electronic databases were searched for peer-reviewed studies investigating children with (suspected) APD in comparison with typically developing peers. Relevant studies were independently reviewed and appraised by 2 reviewers. Methodological quality was quantified using the American Speech-Language-Hearing Association's levels of evidence.RESULTS: Fifty-three relevant studies were identified. Five studies were excluded because of weak internal validity. In total, 48 studies were included, of which only 1 was classified as having strong methodological quality. Significant dissimilarities were found between children referred with listening difficulties and controls. These differences relate to auditory and visual functioning, cognition, language, reading, and physiological and neuroimaging measures.CONCLUSIONS: Methodological quality of most of the incorporated studies was rated moderate due to the heterogeneous groups of participants, inadequate descriptions of participants, and the omission of valid and reliable measurements. The listening difficulties of children with APD may be a consequence of cognitive, language, and attention issues rather than bottom-up auditory processing.
After fifty years of research there is still debate on the concept of auditory processing disorders (APD). We conducted a systematic review to examine the characteristics associated with APD. The purpose of this study is to decide whether APD can be regarded as a unique and identifiable clinical entity.
There is still no consensus about the nature of auditory processing disorders (APD). One of the most frequently reported symptoms for APD is difficulties with hearing and listening, especially in the presence of background noise, despite having normal peripheral hearing (ASHA, 2005; Jerger & Musiek, 2000). It is unclear whether there is a behavioral characteristic or whole set of symptoms that is solely attributable to problems with auditory processing. Such a distinctive feature could help audiologists and speech-language pathologists to differentiate APD from other developmental disorders. The purpose of this systematic review is to evaluate the literature on characteristics of children with suspected APD and to determine whether there is a distinctive feature.
