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Science 18 December 1981:
Vol. 214. no. 4527, pp. 1368 - 1370
DOI: 10.1126/science.7313697
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Articles

Science, Vol 214, Issue 4527, 1368-1370
Copyright © 1981 by American Association for the Advancement of Science

articles

A brain for all seasons: cyclical anatomical changes in song control nuclei of the canary brain

F Nottebohm

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.


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