Langemann U, Gauger B, Klump GM
Institut für Zoologie, Technische Universität München
Anim Behav. 1998 Sep;56(3):763-769. doi: 10.1006/anbe.1998.0879.
Absolute and masked auditory thresholds (critical masking ratios) were determined behaviourally in the great tit, Parus major, using a GO/NOGO-procedure. Absolute sensitivity was measured between 0.25 and 10 kHz. In the absence of noise, great tits were most sensitive to frequencies between 2 and 4 kHz. In background noise, however, the sensitivity was only a function of the noise level and was independent of frequency. Critical masking ratios determined for signals between 0.25 and 8 kHz were almost constant (median values varied between 23.8 and 25.9 dB) irrespective of signal frequency. Therefore, in contrast to the majority of bird species, great tits have unusually low critical masking ratios at high frequencies. This means that great tits can use high-frequency vocalizations to communicate efficiently in noisy (i.e. natural) environments. Copyright 1998 The Association for the Study of Animal Behaviour.
采用“是/否”程序，对大山雀的绝对听觉阈值和掩蔽听觉阈值（临界掩蔽比）进行了行为学测定。绝对灵敏度在0.25至10千赫兹之间进行测量。在无噪声情况下，大山雀对2至4千赫兹之间的频率最为敏感。然而，在背景噪声中，灵敏度仅取决于噪声水平，与频率无关。对于0.25至8千赫兹之间的信号所测定的临界掩蔽比几乎恒定（中值在23.8至25.9分贝之间变化），与信号频率无关。因此，与大多数鸟类不同，大山雀在高频时具有异常低的临界掩蔽比。这意味着大山雀能够利用高频发声在嘈杂（即自然）环境中进行有效的交流。版权所有1998动物行为研究协会。
