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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Dev Neurobiol. 2010 Jan;70(1):41–57. doi: 10.1002/dneu.20752

Figure 4.

Figure 4

Region-specific monoamine candidates for mediating the effects of song environment and mean song length on singing effort. Serotonin metabolism in the CMM (a, b), dopamine metabolism in the NCMv (c, d) and serotonin metabolism in the NCMv (e, f) were positively associated with both song environment and song count. Norepinephrine metabolism in Area X was negatively associated with both g) mean song length and h) song count. Y axes showing song counts have a log-10 scale because count data tend to follow a Poisson distribution.