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