Low- and high-frequency cortical brain oscillations reflect dissociable mechanisms of concurrent speech segregation in noise

被引:10
|
作者
Yellamsetty, Anusha [1 ]
Bidelman, Gavin M. [1 ,2 ,3 ]
机构
[1] Univ Memphis, Sch Commun Sci & Disorders, 4055 North Pk Loop, Memphis, TN 38152 USA
[2] Univ Memphis, Inst Intelligent Syst, Memphis, TN 38152 USA
[3] Univ Tennessee, Ctr Hlth Sci, Dept Anat & Neurobiol, Memphis, TN 38163 USA
关键词
EEG; Time-frequency analysis; Double-vowel segregation; F0-benefit; Speech-in-noise perception; WORKING-MEMORY; ATTENTIONAL MODULATION; PERCEPTUAL SEPARATION; BETA-OSCILLATIONS; NORMAL-HEARING; VOWEL SOUNDS; EEG; SYNCHRONIZATION; CORTEX; GAMMA;
D O I
10.1016/j.heares.2018.01.006
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
Parsing simultaneous speech requires listeners use pitch-guided segregation which can be affected by the signal-to-noise ratio (SNR) in the auditory scene. The interaction of these two cues may occur at multiple levels within the cortex. The aims of the current study were to assess the correspondence between oscillatory brain rhythms and determine how listeners exploit pitch and SNR cues to successfully segregate concurrent speech. We recorded electrical brain activity while participants heard double-vowel stimuli whose fundamental frequencies (F0s) differed by zero or four semitones (STs) presented in either clean or noise-degraded (+5 dB SNR) conditions. We found that behavioral identification was more accurate for vowel mixtures with larger pitch separations but F0 benefit interacted with noise. Time-frequency analysis decomposed the EEG into different spectrotemporal frequency bands. Low-frequency (theta, beta) responses were elevated when speech did not contain pitch cues (OST > 4ST) or was noisy, suggesting a correlate of increased listening effort and/or memory demands. Contrastively, gamma power increments were observed for changes in both pitch (OST > 4ST) and SNR (clean > noise), suggesting high-frequency bands carry information related to acoustic features and the quality of speech representations. Brain-behavior associations corroborated these effects; modulations in low-frequency rhythms predicted the speed of listeners' perceptual decisions with higher bands predicting identification accuracy. Results are consistent with the notion that neural oscillations reflect both automatic (pre-perceptual) and controlled (post-perceptual) mechanisms of speech processing that are largely divisible into high- and low-frequency bands of human brain rhythms. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:92 / 102
页数:11
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