The Journal of Neuroscience, September 6, 2006, ():

High Levels of New Neuron Addition Persist When the Sensitive Period for Song Learning Is Experimentally Prolonged
J. Neurosci. Wilbrecht et al.
26: 9135
Supplemental data
Files in this Data Supplement:
- supplemental material -
Supplemental Discussion
- supplemental material
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Supplementary Figure 1.
Two more examples of song imitation in visual isolates tutored from post-hatching day 79-150. The song of bird C changes in average similarity to the tutor +3%, bird D changes +10%.