Detection of modulation in spectral envelopes and linear-rippled noises by budgerigars (Melopsittacus undulatus)
Detection of modulation in spectral envelopes and linear-rippled noises by budgerigars (Melopsittacus undulatus)
复制标题
DOI：
10.1121/1.426736
复制
发表时间：
1999-03-01
影响因子：
2.4
通讯作者：
Lohr, B
中科院分区：
文献类型：
--
作者：
Amagai, S;Dooling, RJ;Lohr, B
鹦鹉被训练区分复杂的声音与两种不同类型的频谱轮廓，从平坦的频谱，宽带噪声。在一种情况下，通过组合覆盖从500 Hz到10 kHz的频率区域的201个按频率间隔的音调，产生了在（log）频率带宽上具有（log）幅度正弦涟漪的复杂声音。第二种类型的纹波刺激是通过延迟宽带噪声并以迭代方式将其添加到原始噪声中来生成的。在每种情况下，调制深度的阈值（即，以dB为单位的峰谷）在几个不同的涟漪频率下测量（即，对数分布的周期/倍频程）或不同的重复间距（即，涟漪噪声的延迟）。鹦鹉在低空间频率下检测涟漪与人类相似，但在高空间频率下检测对数涟漪光谱中的波纹比人类敏感得多。虎皮鹦鹉在检测宽范围重复音高的宽带噪声中的线性涟漪方面也与人类相似。两者合计，这些数据表明，鸟类听觉系统是至少一样好，如果不是更好：比人类听觉系统在检测噪声中的频谱波纹，尽管在外周和中枢听觉神经系统的总解剖差异。(C)1999年美国声学学会。[S0001-4966（99）03802-3]。
Budgerigars were trained to discriminate complex sounds with two different types of spectral profiles from flat-spectrum, wideband noise. In one case, complex sounds with a sinusoidal ripple in (log) amplitude across (log) frequency bandwidth were generated by combining 201 logarithmically spaced tones covering the frequency region from 500 Hz to 10 kHz. A second type of rippled stimulus was generated by delaying broadband noise and adding it to the original noise in an iterative fashion. In each case, thresholds for modulation depth (i.e., peak-to-valley in dB) were measured at several different ripple frequencies (i.e., cycles/octave for logarithmic profiles) or different repetition pitches (i.e., delay for ripple noises). Budgerigars were similar to humans in detecting ripple at low spatial frequencies, but were considerably more sensitive than humans in detecting ripples in log ripple spectra at high spatial frequencies. Budgerigars were also similar to humans in detecting linear ripple in broadband noise over a wide range of repetition pitches. Taken together, these data show that the avian auditory system is at least as good, if not better: than the human auditory system at detecting spectral ripples in noise despite gross anatomical differences in both the peripheral and central auditory nervous systems. (C) 1999 Acoustical Society of America. [S0001-4966(99)03802-3].