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. 2017 Mar 22;118(2):800–816. doi: 10.1152/jn.00623.2016

Fig. 4.

Fig. 4.

Effects of social context on EGR-1 expression and vocal control in Bengalese and zebra finches. Summarized here are brain areas that show significant differences in EGR-1 expression when birds produce undirected (UD) vs. female-directed (FD) song (light red brain areas). Also depicted are song features that are significantly different when birds produce UD and FD song. In both Bengalese finches (left) and zebra finches (right), EGR-1 expression is greater during UD song than FD song in Area X, LMAN, and RA. However, only in Bengalese finches is EGR-1 expression in HVC greater during UD song. (NIf is not circled in zebra finches because context-dependent changes to EGR-1 expression in NIf have not been analyzed for zebra finches). This species difference in the effects of social context on EGR-1 expression in HVC correlates with species differences in the effects of social context on syllable sequencing, suggesting that evolutionary changes in HVC could mediate species differences in social influences on syllable sequencing.