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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

Table 6.

The best-fit model based on our data of the modulatory factors and central monoaminergic mechanisms influencing song count (n = 18 males; See Table 3 for abbreviation).

Independent variables Estimate Standard Error z Score p-value
Serotonin metabolite in CMM (ng/mg protein) 0.1737 0.0744 2.34 0.019
Norepinephrine metabolite in Area X (ng/mg protein) −0.7725 0.2098 −3.68 < 0.001
Song environment* 0.3807 0.1242 3.07 0.002
Mean song length (s) 0.0949 0.0131 7.26 < 0.001
Intercept −0.0767 0.5355 −0.14 > 0.2
*

Coded 0 for short song, 1 for long song