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In contrast, male zebra finches reared in isolation from other males have more variable songs at day 65 and thereafter can still imitate new sounds (Eales, 1985). We show that, in isolate birds, a greater number of new neurons continues to be added to HVC during the next 85 d, and this number correlates with syllable variability. We suggest that new neuron addition and turnover facilitate song change and that this effect lingers when an expected learning event is delayed.<\/jats:p>","DOI":"10.1523\/jneurosci.4869-05.2006","type":"journal-article","created":{"date-parts":[[2006,9,6]],"date-time":"2006-09-06T15:33:28Z","timestamp":1157556808000},"page":"9135-9141","source":"Crossref","is-referenced-by-count":32,"title":["High Levels of New Neuron Addition Persist When the Sensitive Period for Song Learning Is Experimentally 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