Language experience-dependent advantage in pitch representation in the auditory cortex is limited to favorable signal-to-noise ratios

被引:4
作者
Suresh, Chandan H. [1 ]
Krishnan, Ananthanarayan [1 ]
Gandour, Jackson T. [1 ]
机构
[1] Purdue Univ, Dept Speech Language Hearing Sci, Lyles Porter Hall,715 Clin Dr, W Lafayette, IN 47907 USA
基金
美国国家卫生研究院;
关键词
Pitch; Auditory cortex; Background noise; Binaural release from masking; Experience-dependent plasticity; Signal-to-noise ratio; MASKING LEVEL DIFFERENCE; HUMAN BRAIN-STEM; BINAURAL MASKING; INFERIOR COLLICULUS; NEURAL REPRESENTATION; MUSICAL EXPERIENCE; SPEECH; PLASTICITY; RESPONSES; RELEVANT;
D O I
10.1016/j.heares.2017.09.006
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
Long-term experience enhances neural representation of temporal attributes of pitch in the brainstem and auditory cortex in favorable listening conditions. Herein we examine whether cortical pitch mechanisms shaped by language experience are more resilient to degradation in background noise, and exhibit greater binaural release from masking (BRM). Cortical pitch responses (CPR) were recorded from Mandarin- and English-speaking natives using a Mandarin word exhibiting a high rising pitch (/yi(2)/). Stimuli were presented diotically in Quiet, and in noise at +5, and 0 dB SNR. CPR5 were also recorded in binaural conditions, SONO (where signal and noise were in phase at both ears); or SON7c (where signal was in phase and noise 180 degrees out of phase at each ear), using 0 dB SNR. At Fz, both groups showed increase in CPR peak latency and decrease in amplitude with increasing noise level. A language-dependent enhancement of Na-Pb amplitude (Chinese > English) was restricted to Quiet and +5 dB SNR conditions. At T7/T8 electrode sites, Chinese natives exhibited a rightward asymmetry for both CPR components. A language-dependent effect (Chinese > English) was restricted to T8. Regarding BRM, both CPR components showed greater response amplitude for the S0N pi condition compared to SONO across groups. Rightward asymmetry for BRM in the Chinese group indicates experience -dependent recruitment of right auditory cortex. Restriction of the advantage in pitch representation to the quiet and +5 SNR conditions, and the absence of group differences in the binaural release from masking, suggest that language experience affords limited advantage in the neural representation of pitch-relevant information in the auditory cortex under adverse listening conditions. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:42 / 53
页数:12
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