University of Chicago biologists Amish Dave and Daniel Margoliash looked into the brains of zebra finches and discovered something similar. These birds are not born with the melodies of their songs hardwired into the brains; instead, they have to learn to sing their songs. When they're awake, the neurons in part of the finches' forebrain called the robutus archistriatalis fire following their singing of particular notes. Researchers can determine which note was sung based on the firing patterns of those neurons. By piecing together the electrical patterns in those neurons over time, Dave and Margoliash can reconstruct the entire song from start to finish.
芝加哥大学的生物学家阿米什·戴夫(Amish Dave)和丹尼尔·马格赖许(Daniel Margoliash)观察了斑胸草雀的大脑,并有了类似的发现。这些鸟并不是天生脑子里就有歌曲的旋律,相反,它们要通过学习才能唱歌。当斑胸草雀醒着的时候,在它们唱到某些特定音符时,其前脑中古纹状体粗核部位的神经细胞就会开始活动。研究者们基于这些神经细胞的活动模式就可以判定斑胸草雀唱到了哪个音符。通过把这些神经细胞中的电流模式拼合,戴夫和马格赖许就能把整首歌从头到尾地重现了。
Later, when the birds were asleep, Dave and Margoliash looked again at the electrical activity in that part of their brains. The firing of those neurons wasn't entirely random. Instead, the neurons fired in order, as if the bird was audibly singing the song, note for note. It might be said that the zebra finches were practising their songs while they slumbered.
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