The interpretation in Wilson (2018) of different position statements and/or guidelines on APD throughout the world is both interesting and useful. This letter to the editor clarifies that the recent European APD consensus is broader than interpreted. Specifically, it endorses the clinical entity of APD (implemented in ICD-11 Beta version), encloses International Bureau for Audiophonologie and Danish Medical Audiological Society's guidelines and does not propose that APD is primarily a deficit of auditory attention. Aspects of both the psychosocial and the language learning approach are acknowledged in the European consensus paper. Finally, we are pleased that the diagnostic criteria proposed in Wilson ( 2018) are mostly in agreement with those in the European Consensus paper, but further developed, in that they include aspects of the individual's circumstances or environment that may affect the clinical presentation, along the lines of the International Classification of Functioning, Disability and Health, and in that they explicitly state that APD is a spectrum disorder.
This study evaluated the use of multiple auditory steady-state responses (ASSRs) to estimate the growth of loudness in listeners with normal hearing. Individual intensity functions were obtained from measures of loudness growth using the contour test and from the electrophysiological amplitude measures of multiple amplitude-modulated (77-105 Hz) tones (500, 1000, 2000, and 4000 Hz) simultaneously presented to both ears and recorded over the scalp. Slope analyses for the behavioural and electrophysiological intensity functions were separately performed. Response amplitudes of the ASSRs and loudness sensation judgements increase as the stimulus intensity increases for the four frequencies studied. A significant relationship was obtained between loudness and the ASSRs. The results of this study suggest that the amplitude of the ASSRs may be used to estimate loudness growth at least for individuals with normal hearing.
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