鸣禽惊吓叫声与刺激中脑丘间复合体背内侧核诱发叫声的比较

Comparison between frightened calls and stimulating DM nucleus evoked calls in songbirds

中脑丘间复合体背内侧核 (DM )是发声的基本中枢 .刺激DM核团诱发叫声的语图表现为单柱状 ,频率可高达 1 2 0 0 0Hz以上 .在语图中表现出具鸣肌特性的噪音与乐音相混合 .刺激左、右侧DM诱发的叫声 ,各项声学指标没有明显的差异 ,但不同种类的鸟之间在波形、频带范围上则有不同 .惊吓叫声的语图也表现为柱状、各个频带所在的范围较宽、乐声与噪声共存等特点 ,但不同种类的鸟有明显的种族差异 .这表明惊吓叫声与刺激DM核团诱发的叫声具有种属差异 ,但同种之间有相似性 .

DM is the basic center of vocal control in midbrain, the spectrum of stimulating the nucleus show the pillar shape, the part of high frequency can up to 12 000 Hz. The left and right DM have no obvious difference, but different kind birds gave different range of frequency and shape of spectrum. The spectrum of frightened calls also show pillar shape, every frequency band is more wide, different kinds of birds are evidently different.