Temporal structure in zebra finch song: Implications for motor coding
Temporal structure in zebra finch song: Implications for motor coding
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DOI：
10.1523/jneurosci.3387-05.2006
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发表时间：
2006-01-18
影响因子：
5.3
通讯作者：
Troyer, TW
中科院分区：
文献类型：
--
作者：
Glaze, CM;Troyer, TW
成年斑胸草雀的歌声由刻板的音节序列组成。虽然一些行为和生理数据表明，歌曲是分层结构的，但也有证据表明，它们是由运动前核HVC（用作专有名称）中的非分层、时钟样的爆发驱动的。在这项研究中，我们开发了一个半自动模板匹配算法，以确定重复的音节序列和修改后的动态时间规整算法，使细粒度的测量的时间结构的歌曲。我们发现，在歌曲长度的变化表示在整个歌曲作为一个整体，而不是在演唱过程中的独立方差的积累。歌声的长度在一天中会有系统地变化，这与鸟类活动的一般水平以及雌性的存在有关。数据还显示了变异模式，表明音节和间隙长度的不同机制：随着克里思的变化，音节的拉伸和压缩比例小于间隙，而音节-音节和间隙-间隙的相关性明显强于音节-间隙的相关性。也有增加的时间变化在主题的边界和特别强的正相关性之间的相同音节唱不同的主题。最后，我们发现的证据表明，音节首可能有一个特殊的作用，在调整音节与全球歌曲结构。通常，定时数据支持分层视图，其中歌曲由较小的基于音节的单元组成，并且提供用于解释生理记录的结果的一组丰富的约束。
Adult zebra finch songs consist of stereotyped sequences of syllables. Although some behavioral and physiological data suggest that songs are structured hierarchically, there is also evidence that they are driven by nonhierarchical, clock-like bursting in the premotor nucleus HVC( used as a proper name). In this study, we developed a semiautomated template-matching algorithm to identify repeated sequences of syllables and a modified dynamic time-warping algorithm to make fine-grained measurements of the temporal structure of song. We find that changes in song length are expressed across the song as a whole rather than resulting from an accumulation of independent variance during singing. Song length changes systematically over the course of a day and is related to the general level of bird activity as well as the presence of a female. The data also show patterns of variability that suggest distinct mechanisms underlying syllable and gap lengths: as tempo varies, syllables stretch and compress proportionally less than gaps, whereas syllable - syllable and gap - gap correlations are significantly stronger than syllable - gap correlations. There is also increased temporal variability at motif boundaries and especially strong positive correlations between the same syllables sung in different motifs. Finally, we find evidence that syllable onsets may have a special role in aligning syllables with global song structure. Generally, the timing data support a hierarchical view in which song is composed of smaller syllable-based units and provide a rich set of constraints for interpreting the results of physiological recordings.