Sinnott J M, Petersen M R, Hopp S L
J Acoust Soc Am. 1985 Dec;78(6):1977-85. doi: 10.1121/1.392654.
Frequency and intensity DLs were compared in humans and monkeys using a repeating standard "yes-no" procedure in which subjects reported frequency increments, frequency decrements, intensity increments, or intensity decrements in an ongoing train of 1.0-kHz tone bursts. There was only one experimental condition (intensity increments) in which monkey DLs (1.5-2.0 dB) overlapped those of humans (1.0-1.8 dB). For discrimination of both increments and decrements in frequency, monkey DLs (16-33 Hz) were approximately seven times larger than those of humans (2.4-4.8 Hz), and for discrimination of intensity decrements, monkey DLs (4.4-7.0 dB) were very unstable and larger than those of humans (1.0-1.8 dB). For intensity increment discrimination, humans and monkeys also exhibited similar DLs as SL was varied. However, for frequency increment discrimination, best DLs for humans occurred at a high (50 dB) SL, whereas best DLs for monkeys occurred at a moderate (30 dB) SL. Results are discussed in terms of various neural mechanisms that might be differentially engaged by humans and monkeys in performing these tasks; for example, different amounts of temporal versus rate coding in frequency discrimination, and different mechanisms for monitoring rate decreases in intensity discrimination. The implications of these data for using monkeys as models of human speech sound discrimination are also discussed.
使用重复标准的“是-否”程序，在人类和猴子中比较了频率辨别阈（DLs）和强度辨别阈，在该程序中，受试者报告在持续的1.0千赫纯音脉冲序列中的频率增加、频率降低、强度增加或强度降低。只有一种实验条件（强度增加）下，猴子的辨别阈（1.5 - 2.0分贝）与人类的辨别阈（1.0 - 1.8分贝）重叠。对于频率增加和降低的辨别，猴子的辨别阈（16 - 33赫兹）大约是人类辨别阈（2.4 - 4.8赫兹）的七倍，对于强度降低的辨别，猴子的辨别阈（4.4 - 7.0分贝）非常不稳定且大于人类的辨别阈（1.0 - 1.8分贝）。对于强度增加辨别，随着感觉级（SL）变化，人类和猴子也表现出相似的辨别阈。然而，对于频率增加辨别，人类的最佳辨别阈出现在高感觉级（50分贝），而猴子的最佳辨别阈出现在中等感觉级（30分贝）。根据人类和猴子在执行这些任务时可能不同地参与的各种神经机制来讨论结果；例如，在频率辨别中时间编码与速率编码的不同量，以及在强度辨别中监测速率降低的不同机制。还讨论了这些数据对于将猴子用作人类语音辨别模型的意义。
