Relation between the growth of loudness and high-frequency excitation.
Relation between the growth of loudness and high-frequency excitation.
复制标题
响度增长与高频激励之间的关系。
DOI：
--
复制
发表时间：
1994
影响因子：
2.4
通讯作者：
R. Hellman
中科院分区：
文献类型：
--
作者：
R. Hellman
为了验证耳蜗损伤和正常耳朵中的掩蔽噪声对响度增长产生类似影响的猜想，测量了21名听众的响度，所有听众都患有双侧对称高频耳蜗损失。在正常听力区之外，第一组中10名听众的阈值增加了30-49 dB/倍频程，第二组中11名听众的阈值增加了51-71 + dB/倍频程。在阈值正常的两个频率下，通过绝对幅度估计和生产来测量，响度增长的动态范围并没有被相邻的听力损失所改变。然而，对于斜坡来说，情况并非如此。而整体形状和斜率的响度函数基本上是相同的组I，组II的中高电平斜率是明显平坦的音调在截止频率比一个较低的频率音调。与此相反，显着陡峭的响度功能，特征的响度招聘，获得两组在该地区的听力受损的频率。对于具有陡峭低通损失的听众，在正常听力区域中观察到的响度增长率降低，就像通常发现的被相邻高频噪声掩盖的音调的降低一样，归因于音调的受限激励模式。这些结果表明，高频听觉线索被有效地消除了陡峭的斜坡高频听力损失，就像他们被消除了外部噪声。
To test the conjecture that cochlear impairment and a masking noise in normal ears produce analogous effects on the growth of loudness, loudness was measured for 21 listeners, all with bilateral symmetrical high-frequency cochlear losses. Beyond the normal-hearing region, thresholds increased by 30-49 dB/octave for 10 listeners in group I and by 51-71 + dB/octave for 11 listeners in group II. Measured by absolute magnitude estimation and production at two frequencies where thresholds were normal, the dynamic range over which loudness grows was not altered by the adjacent hearing loss. This was not true however, for the slope. Whereas the overall shape and slope of the loudness functions were essentially the same for group I, the mid-to-high level slope for group II was noticeably flatter for a tone at the cutoff frequency than for a lower-frequency tone. In contrast, markedly steeper loudness functions, characteristic of loudness recruitment, were obtained for both groups at a frequency in the region of impaired hearing. The reduced rate of loudness growth observed in the region of normal hearing for listeners with steep low-pass losses, like the reduction usually found for a tone masked by an adjacent high-frequency noise, is ascribed to the tone's restricted excitation pattern. These results indicate that high-frequency auditory cues are effectively eliminated by a steeply sloping high-frequency hearing loss just as they are eliminated by the addition of an external noise.