The effect of acoustic feedback in an auditory Posner paradigm: delay effect and bias in ERP

摘要

A ‘delay effect’ occurs when a subject hears the sound of his own voice that is delayed by fewmilliseconds. This abnormal feedback induces difficulties in the articulation of language.This study aims to investigate ERP modulation during an auditory Posner paradigm anauditory delay effect (DAF) training. Main ERPs results highlighted delayed latencies andgreater amplitudes after DAF. This can indicate how auditory feedback systems affect motorand auditory attentional early processes, by altering not only the task itself in languageperformance, but also producing a delayed bias in ERP components. So, if the acousticfeedback is naturally presented without delayed latency (NDAF), subjects will have nodifficulty in producing verbal language and no ERP bias. If the stimulus is presented as DAF,subjects will present difficulties in articulating language, and will show ERP bias, inparticular in frontoparietal, in temporoparietal, and in parietal ROI. This highlights themomentary interruption of an automatic process.