Localization of click trains and speech by cats: the negative level effect.
Localization of click trains and speech by cats: the negative level effect.
复制标题
猫的点击序列和言语的本地化：负水平效应。
DOI：
10.1007/s10162-014-0469-5
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Yin,TomCT
中科院分区：
文献类型：
--
作者：
Gai,Yan;Ruhland,JanetL;Yin,TomCT
虽然在海拔的声音定位被认为取决于频谱线索，它已被证明与人类听众的声音的时间特征也可以大大影响定位性能。特别令人感兴趣的是一种被称为负电平效应的现象，它描述了随着声级的增加而在仰角中定位能力的恶化，并且仅在脉冲或短持续时间的声音中观察到。本研究使用家猫的注视位置作为测量不同方位角和仰角的声音目标的感知位置。声音水平对定位的准确性，精度和响应延迟方面的影响进行了测试，声音具有不同的时间特征，如点击列车，单击，连续的声音，具有相同的频谱的点击列车，和语音片段。与先前的人类研究一致，仅在点击样刺激和海拔高度中观察到负水平效应。事实上，当声音水平增加时，语音在海拔高度的定位明显受益。我们的研究结果表明，声音的时间连续性会影响听觉系统进行的频率分析，语音中包含的频谱的变化不会干扰其在海拔位置的频谱编码。
Although localization of sound in elevation is believed to depend on spectral cues, it has been shown with human listeners that the temporal features of sound can also greatly affect localization performance. Of particular interest is a phenomenon known as the negative level effect, which describes the deterioration of localization ability in elevation with increasing sound level and is observed only with impulsive or short-duration sound. The present study uses the gaze positions of domestic cats as measures of perceived locations of sound targets varying in azimuth and elevation. The effects of sound level on localization in terms of accuracy, precision, and response latency were tested for sound with different temporal features, such as a click train, a single click, a continuous sound that had the same frequency spectrum of the click train, and speech segments. In agreement with previous human studies, negative level effects were only observed with click-like stimuli and only in elevation. In fact, localization of speech sounds in elevation benefited significantly when the sound level increased. Our findings indicate that the temporal continuity of a sound can affect the frequency analysis performed by the auditory system, and the variation in the frequency spectrum contained in speech sound does not interfere much with the spectral coding for its location in elevation.