Desynchronisation of auditory steady-state responses related to changes in interaural phase differences: an objective measure of binaural hearing

作者：Vercammen Charlotte^*; van Wieringen Astrid; Wouters Jan; Francart Tom

来源：International Journal of Audiology, 2017, 56(7): 464-471.

DOI：10.1080/14992027.2017.1288304

• Electroencephalography
• auditory steady-state responses
• binaural hearing
• interaural phase differences
• modulation frequency

Objective: Binaural processing can be measured objectively as a desynchronisation of phase-locked neural activity to changes in interaural phase differences (IPDs). This was reported in a magnetoencephalography study for 40Hz amplitude modulated tones. The goal of this study was to measure this desynchronisation using electroencephalography and explore the outcomes for different modulation frequencies. Design: Auditory steady-state responses (ASSRs) were recorded to pure tones, amplitude modulated at 20, 40 or 80Hz. IPDs switched between 0 and 180 degrees at fixed time intervals. Study sample: Sixteen young listeners with bilateral normal hearing thresholds (25dB HL at 125-8000Hz) participated in this study. Results: Significant ASSR phase desynchronisations to IPD changes were detected in 14 out of 16 participants for 40Hz and in 8, respectively 9, out of 13 participants for 20 and 80Hz modulators. Desynchronisation and restoration of ASSR phase took place significantly faster for 80Hz than for 40 and 20Hz. Conclusions: ASSR desynchronisation to IPD changes was successfully recorded using electroencephalography. It was feasible for 20, 40 and 80Hz modulators and could be an objective tool to assess processing of changes in binaural information.

• 出版日期2017
• 单位KU Leuven