Age-related differences in the temporal modulation transfer function with pure-tone carriers.
Age-related differences in the temporal modulation transfer function with pure-tone carriers.
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DOI：
10.1121/1.2998779
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
Dubno JR
中科院分区：
文献类型：
--
作者：
He NJ;Mills JH;Ahlstrom JB;Dubno JR
在500-和4000-Hz音调载波的幅度调制（AM）的检测被测量为调制频率的函数，从年轻人和老年人正常听力通过4000 Hz。两组对AM敏感性增加的调制频率（“过渡频率”）相似。时间调制传递函数的形状表现出显着的年龄相关的差异。对于较年轻的受试者，AM检测阈值通常是恒定的低调制频率。对于更高的载波频率，AM检测阈值然后随着调制频率进一步增加而增加，直到过渡频率。相反，老年受试者的AM检测随着调制频率的增加而不断增加，表明与年龄相关的时间分辨率下降，包络波动更快。当AM检测依赖于时间线索时，观察到与年龄相关的显著差异。对于高于过渡频率的调制频率，与年龄相关的差异对于较低频率载波（其中时间和频谱线索都可用）比对于较高频率载波（其中AM检测主要取决于频谱线索）更大。这些结果是一致的一般年龄相关的下降同步的神经反应的载波波形和包络波动。
Detection of amplitude modulation (AM) in 500- and 4000-Hz tonal carriers was measured as a function of modulation frequency from younger and older adults with normal hearing through 4000 Hz. The modulation frequency above which sensitivity to AM increased (“transition frequency”) was similar for both groups. Temporal modulation transfer function shapes showed significant age-related differences. For younger subjects, AM detection thresholds were generally constant for low modulation frequencies. For a higher carrier frequency, AM detection thresholds then increased as modulation frequency further increased until the transition frequency. In contrast, AM detection for older subjects continuously increased with increasing modulation frequency, indicating an age-related decline in temporal resolution for faster envelope fluctuations. Significant age-related differences were observed whenever AM detection was dependent on temporal cues. For modulation frequencies above the transition frequency, age-related differences were larger for the lower frequency carrier (where both temporal and spectral cues were available) than for the higher frequency carrier (where AM detection was primarily dependent on spectral cues). These results are consistent with a general age-related decline in the synchronization of neural responses to both the carrier waveform and envelope fluctuation.
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DOI：
10.1044/jshr.3503.642
发表时间：
1992-06-01
期刊：
JOURNAL OF SPEECH AND HEARING RESEARCH
影响因子：
--
作者：
BACON, SP;GLEITMAN, RM
通讯作者：
GLEITMAN, RM
影响因子：
2.4
作者：
Dau, T;Verhey, J;Kohlrausch, A
通讯作者：
Kohlrausch, A
影响因子：
2.4
作者：
Dau, T;Kollmeier, B;Kohlrausch, A
通讯作者：
Kohlrausch, A
影响因子：
2.4
作者：
GU, X;GREEN, DM
通讯作者：
GREEN, DM
影响因子：
2.4
作者：
Moore, BCJ;Glasberg, BR
通讯作者：
Glasberg, BR