电刺激鸣禽高级发声中枢诱发叫声的声谱分析

Sonogram of evoked call by stimulating higher vocal center (HVC) in songbird

栗巫鸟每侧高级发声中枢 (HVC)均有发出简单音节的能力 ,并决定正常鸣啭的音节时间和能量特征 .电刺激两侧HVC均可以诱发简单的叫声 .与正常的鸣啭音节相比 ,声学特征上表现为音节时程长、频率幅度变化小、能量不集中且极少有复杂音节和陪音的出现 .刺激左侧HVC所诱发的叫声 ,其基本音的频带起止均明显高于右侧诱发叫声 ,暗示左侧HVC控制频率较高、较复杂的音节 ,也为左侧优势理论提供了声学上的证据 .

Either side of HVC can independently produce some simple syllables and mainly control the sound length, energy character in syllables of normal song in songbird( Emberiza rutila ). The evoked calls of electrical stimulation show that the longer syllable timbre, more narrow frequency various brand. That the calls from left HVC have higher starting and ending frequency than that of right HVC suggests left HVC control the higher frequency and more complicated syllables, the results provide the evidence for left dominant theory of the vocal control.