Acoustic Change Complex (ACC) using Speech and Non-Speech Stimuli in Normal Hearing Children

Abstract

ortical auditory evoked potentials (CAEPs) are brain responses evoked by sound and are processed in or near the auditory cortex. To date, a number of CAEPs have been described in the literature. There has been considerable clinical and scientific interest in CAEPs to probe threshold and suprathreshold auditory processes because they are believed to reflect the neural detection and/or discrimination of sound underlying speech perception. These measures include obligatory evoked potentials such as P1, N1, and P2, and discriminative potentials such as mismatch negativity (MMN), P300 and acoustic change complex (ACC) which are all considered long latency auditory evoked potentials (LLAEP). The Acoustic Change Complex (ACC) is a cortical auditory evoked potential (P1-N1-P2) elicited by a change within an ongoing sound stimulus. It may function as an electrophysiological measure of the neural processes that underlie detection of changes in an ongoing acoustic signal. Consequently, it has been suggested that the ACC response can serve as an index of auditory discrimination ability. The present study was originally designed to standardize ACC evoked auditory cortical response in 41 normal hearing children aged from 2 to 10 years. Stimuli used in this study were specifically designed for auditory evoked potential (AEP) equipment that are capable of uploading short duration