婴儿和成人中包络跟随反应（EFRs）和频率跟随反应（FFRs）的相干分析。

Coherence analysis of envelope-following responses (EFRs) and frequency-following responses (FFRs) in infants and adults.

作者信息

Levi E C, Folsom R C, Dobie R A

机构信息

Department of Speech and Hearing Sciences, University of Washington, Seattle 98915, USA.

出版信息

Hear Res. 1995 Sep;89(1-2):21-7. doi: 10.1016/0378-5955(95)00118-3.

DOI:10.1016/0378-5955(95)00118-3

PMID:8600128

Abstract

The frequency-following response (FFR) and the envelope-following response (EFR) were recorded in 1-month-old infants and in adults to examine the development of temporal coding. The stimuli were amplitude-modulated (AM) tones. A modulation frequency of 80 Hz was used in infants; modulation frequencies of 40 and 80 Hz were used in adults. The effects of intensity, carrier frequency, and modulation frequency on these responses were studied. Responses were analyzed using magnitude-squared coherence. The effect of intensity on the growth of FFR- and EFR-coherence were similar in infants and adults. In addition, the growth functions were not affected by the carrier frequency or the modulation frequency of the stimulus. FFR thresholds did not differ across age groups. 'Best frequency' (i.e., infant 80 Hz and adult 40 Hz) EFR thresholds were the same for infants and adults at 500 and 1000 Hz, but infant EFR thresholds were poorer than adult thresholds at 2000 Hz. Thus, although FFRs and EFRs are primarily adult-like at 1 month of age, there are some age differences in the EFR that deserve further study.

摘要

在1月龄婴儿和成年人中记录频率跟随反应（FFR）和包络跟随反应（EFR），以研究时间编码的发育情况。刺激为调幅（AM）音调。婴儿使用80Hz的调制频率；成年人使用40Hz和80Hz的调制频率。研究了强度、载波频率和调制频率对这些反应的影响。使用均方幅度相干性分析反应。强度对FFR和EFR相干性增长的影响在婴儿和成年人中相似。此外，增长函数不受刺激的载波频率或调制频率的影响。FFR阈值在各年龄组之间没有差异。“最佳频率”（即婴儿为80Hz，成年人为40Hz）的EFR阈值在500Hz和1000Hz时婴儿和成年人相同，但在2000Hz时婴儿的EFR阈值比成年人的阈值差。因此，尽管FFR和EFR在1月龄时主要与成年人相似，但EFR中存在一些年龄差异值得进一步研究。