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. 2012 Jan 18;32(3):761–774. doi: 10.1523/JNEUROSCI.3434-11.2012

Figure 3.

Figure 3.

The packing density of Hu-positive neurons significantly increases with age in the HVC, but not in an area of NC ventral to HVC, in adult male zebra finches. a, The packing density of Hu-positive neurons in HVC significantly increases between 90 d and 9 years of age in adult male zebra finches (p = 0.0002). b, In the same group of birds, there is no significant change in the packing density of Hu-positive neurons with age in an area of NC just ventral to HVC (see Fig. 1c). Each data point represents the counts from either left or right HVC within one bird. There was no systematic difference in neuron density between the left and right hemispheres in either HVC or NC densities.