Nottebohm F
Science. 1981 Dec 18;214(4527):1368-70. doi: 10.1126/science.7313697.
Male canaries that have reached sexual maturity can, in subsequent years, learn new song repertoires. Two telencephalic song control nuclei, the hyperstriatum ventrale, pars caudale, and nucleus robustus archistriatalis are, respectively, 99 and 76 percent larger in the spring, when male canaries are producing stable adult song, than in the fall, at the end of the molt and after several months of not singing. It is hypothesized that such fluctuations reflect an increase and then reduction in numbers of synapses and are related to the yearly ability to acquire new motor coordinations.
达到性成熟的雄性金丝雀在随后的年份里能够学习新的歌曲曲目。两个端脑歌曲控制核团，即腹侧上纹状体尾部和古纹状体粗核，在春季（此时雄性金丝雀发出稳定的成年歌曲）比秋季（换羽结束后且数月未歌唱）分别大99%和76%。据推测，这种波动反映了突触数量先增加后减少的情况，并且与每年获得新运动协调能力有关。
