损毁成年白腰文鸟前脑界面核对鸣曲复杂性的影响

NIf nucleus lesion effect on birdsong complexity in adult Bengalese finches(Lonchura striata)

双侧电损毁成年雄性白腰文鸟(Lonchura striata)界面核NIf(nucleus interfacialis nidopallii),比较损毁前后鸣曲声谱的结构变化以及对声谱参数进行分析,以了解NIf损毁后对鸣唱行为的影响.结果显示:1)短语层面(phraselevel)上发生了长期的简化,音节出现变形并且趋向于同一种音节,音节有严重缺失;2)损毁30d后非典型鸣曲出现大量缺失或缩短,其中部分非典型鸣曲的时长变短并且音节也出现变形;3)损毁后鸣曲音节噪音化,参数中平均频率升高,熵值降低.以上结果表明,损毁NIf显著降低了白腰文鸟鸣曲的复杂性,提示NIf在复杂鸣曲的维持中有重要的生理功能.

The spectrogram of recorded birdsongs was analyzed in the present study, birdsong features were compared in pre-and post-lesion adult male Bengalese finches. Birdsong complexity in phrase-level was found to decrease. One syllable was distorted and became similar to the other one. At 30th day post-lesion, non-typical songs lost largely and were generally shortened. After-lesion-songs showed more noise that their feature statistics; mean frequence increased, but entropy reduced. Bilateral lesion of NIf nuclei was found to reduce birdsong variations, suggesting that NIf is involved in song complexity, and plays an important role in song production.