Detection Thresholds for Amplitude Modulations of Tones in Budgerigar, Rabbit, and Human
Detection Thresholds for Amplitude Modulations of Tones in Budgerigar, Rabbit, and Human
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DOI：
10.1007/978-1-4614-1590-9_43
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发表时间：
2013-01-01
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影响因子：
--
通讯作者：
Idrobo, Fabio
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作者：
Carney, Laurel H.;Ketterer, Angela D.;Idrobo, Fabio
复杂声音的包络波动携带着对许多类型的辨别和噪声中的检测至关重要的信息。为了研究包络信息的神经表征和处理声音的时间方面的机制，识别可以灵敏地检测振幅调制（AM）的动物模型是有用的。控制语音的低调制频率特别令人感兴趣。然而，以前研究的大多数动物模型在低调制频率下对AM相对不敏感。兔子对低频调制有很高的阈值，特别是对音调载波。恒河猴对宽带噪声的低频调制不如人类敏感（O 'Conner等人Hear Res 277，37-43，2011）。大鼠和栗鼠对于噪声的幅度调制也具有比人类更高的阈值（Kelly等人，J Comp Psychol 120，98-105，2006;亨德森等人，J Acoust Soc Am 75，1177-1183，1984）。相比之下，虎皮鹦鹉具有用于宽带噪声的AM检测的阈值，其类似于人类听众在低调制频率下的阈值（Dooling和Searcy. Percept Psychophys 46，65-71，1981）。一个间隔，两个替代操作条件反射程序被用来估计AM检测阈值为4 kHz的音调载波在低调制频率（4-256 Hz）。Budgerigar阈值与人类受试者在可比任务中的阈值相当。这些比较结果的复杂的声音的时间编码的影响进行了讨论。掩蔽AM检测的比较结果。
Envelope fluctuations of complex sounds carry information that is essential for many types of discrimination and for detection in noise. To study the neural representation of envelope information and mechanisms for processing of this temporal aspect of sounds, it is useful to identify an animal model that can sensitively detect amplitude modulations (AM). Low modulation frequencies, which dominate speech sounds, are of particular interest. Yet, most animal models studied previously are relatively insensitive to AM at low modulation frequencies. Rabbits have high thresholds for low-frequency modulations, especially for tone carriers. Rhesus macaques are less sensitive than humans to low-frequency modulations of wideband noise (O'Conner et al. Hear Res 277, 37-43, 2011). Rats and chinchilla also have higher thresholds than humans for amplitude modulations of noise (Kelly et al. J Comp Psychol 120, 98-105, 2006; Henderson et al. J Acoust Soc Am 75, 1177-1183, 1984). In contrast, the budgerigar has thresholds for AM detection of wideband noise similar to those of human listeners at low modulation frequencies (Dooling and Searcy. Percept Psychophys 46, 65-71, 1981). A one-interval, two-alternative operant conditioning procedure was used to estimate AM detection thresholds for 4-kHz tone carriers at low modulation frequencies (4-256 Hz). Budgerigar thresholds are comparable to those of human subjects in a comparable task. Implications of these comparative results for temporal coding of complex sounds are discussed. Comparative results for masked AM detection are also presented.