Acoustic change responses to amplitude modulation: a method to quantify cortical temporal processing and hemispheric asymmetry.

ABSTRACT:

Objective

Sound modulation is a critical temporal cue for the perception of speech and environmental sounds. To examine auditory cortical responses to sound modulation, we developed an acoustic change stimulus involving amplitude modulation (AM) of ongoing noise. The AM transitions in this stimulus evoked an acoustic change complex (ACC) that was examined parametrically in terms of rate and depth of modulation and hemispheric symmetry.

Methods

Auditory cortical potentials were recorded from 64 scalp electrodes during passive listening in two conditions: (1) ACC from white noise to 4, 40, 300 Hz AM, with varying AM depths of 100, 50, 25% lasting 1 s and (2) 1 s AM noise bursts at the same modulation rate. Behavioral measures included AM detection from an attend ACC condition

SUBMITTER: Han JH 

PROVIDER: S-EPMC4324071 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature