Walking in Fourier's space: algorithms for the computation of periodicities in song patterns by the cricket Gryllus bimaculatus
Walking in Fourier's space: algorithms for the computation of periodicities in song patterns by the cricket Gryllus bimaculatus
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DOI：
10.1007/s00359-009-0473-0
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发表时间：
2009-10-01
影响因子：
2.1
通讯作者：
Hennig, R. Matthias
中科院分区：
文献类型：
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作者：
Hennig, R. Matthias
声信号包络的辨别是基于频谱计算还是基于时间计算？为了研究板栗的这一问题，通过添加几个正弦波来构建图案包络，并通过系统的相位变化来修改图案包络。雌性蟋蟀对这种正弦和矩形脉冲模式的音位反应在运动补偿器上被量化。以25赫兹的调制频率为主要频率的包络图案是有吸引力的，尽管相位的变化改变了时间图案，但吸引力的值仍然不受影响。去除25赫兹成分会降低音向性分数。其他频率分量表现出比25赫兹分量更大幅度的模式不那么有吸引力。然而，在一种模式中，不吸引人的脉冲周期与吸引人的调制频率25赫兹的组合表明，尽管存在25赫兹的分量，但这种刺激并不吸引人。对所有图案的吸引力的比较表明，雌性蟋蟀在广泛的占空比范围内评估脉冲周期的持续时间。综合证据表明，图案包络是在时间上处理的，而不是在光谱域中处理的。
Is discrimination of the envelope of an acoustic signal based on spectral or temporal computations? To investigate this question for the cricket Gryllus bimaculatus, pattern envelopes were constructed by the addition of several sine waves and modified by systematic phase changes. The phonotactic response of female crickets towards such sinusoidal but also rectangular pulse patterns was quantified on a locomotion compensator. Envelope patterns that exhibited a modulation frequency of 25 Hz as the dominant frequency were attractive and although changes of phase modified the temporal pattern, the values of attractiveness remained unaffected. Removal of the 25-Hz component reduced the phonotactic scores. Patterns in which other frequency components exhibited a larger amplitude than the 25-Hz component were less attractive. However, the combination of an unattractive pulse period with the attractive modulation frequency of 25 Hz in a pattern revealed that such stimuli were unattractive despite the presence of the 25-Hz component. A comparison of the attractiveness of all patterns revealed that female crickets evaluated the duration of pulse period over a wide range of duty cycles. The combined evidence showed that pattern envelopes were processed in the time- and not in the spectral domain.