Table 3.

Results of regression models demonstrating behaviors and brain regions in which endocannabinoid-related expression explain variance in song-associated reward (measured via CPP).

Endocannabinoid-related gene	Regression model	Variables	Beta	p

CB₁ receptor n = 14	Adjusted R² = 0.770 F_5,8 = 9.69 p = 0.0030	VTA	0.374	0.0466^*
		PAG	-0.468	0.0131^*
		POM	-0.028	0.8724
		Number of songs	0.398	0.0495^*
		Non-vocal behaviors	0.007	0.9653

FABP7 n = 13	Adjusted R² = 0.687 F_5,7 = 6.27 p = 0.0160	VTA	-0.058	0.7932
		PAG	-0.460	0.0476^*
		POM	0.771	0.0133^*
		Number of songs	-0.020	0.9475
		Non-vocal behaviors	-0.091	0.6432

FABP5 n = 13	Adjusted R² = 0.409 F_5,7 = 2.66 p = 0.1172	VTA	-0.047	0.8541
		PAG	-0.132	0.7388
		POM	0.751	0.1366
		Number of songs	0.298	0.3319
		Non-vocal behaviors	-0.078	0.7933

FAAH^† n = 12	Adjusted R² = 0.565 F_4,7 = 4.57 p = 0.0394	PAG	-0.186	0.3908
		POM	-0.281	0.2485
		Number of songs	0.369	0.1787
		Non-vocal behaviors	0.452	0.0867

DAGLα^†† n = 15	Adjusted R² = 0.385 F_3,11 = 3.92 p = 0.0398	POM	0.027	0.9033
		Number of songs	0.611	0.0340^*
		Non-vocal behaviors	0.177	0.4934

Indicates a significant predictor variable (p ≤ 0.05).

^†

Indicates VTA was not included in regression model (see text for details).

^††

Indicates VTA and PAG were not included in regression model (see text for details).