Table 1. Correlation coefficients of the relationship between the number of elements copied from the tutor song and Zenk expression in the HVC, RA and Area X for groups of birds exposed to the tutor song (TUTOR), bird’s own song (BOS), or novel conspecific song (NOVEL).

Stimulus	TUTOR		BOS		NOVEL
	r	p-value	r	p-value	r	p-value
HVC	0.30	NSa	0.65	0.029	−0.24	NS
RA	0.43	NS	0.40	NS	−0.53	NS
Area X	0.14	NS	0.52	NS	−0.373	NS

^aNS, Not Significant; p-values <0.05 were considered significant.