Table 2.

Statistical data of sucrose to alcohol fading (FR1).

	Sucrose acquisition	Sucrose to alcohol fading	FR1 alcohol
Earned rewards
Session	F(5.45,92.63) = 40.80***	F(21,357) = 20.06***	F(5,85) = 2.25
Strain	F(1,17) = 1.84	F(1,17) = 5.51*	F(1,17) = 18.78***
Session*Strain	F(5.45,92.63) = 2.20	F(21,357) = 8.50***	F(5,85) = 1.34
Preference for active lever
Session	F(5.58,94.86) = 5.89***	F(21,357) = 3.59**	F(2.27,38.57) = 0.64
Strain	F(1,17) = 0.001	F(1,17) = 0.41	F(1,17) = 2.53
Session*Strain	F(5.58,94.86) = 3.54**	F(21,357) = 1.24	F(2.27,38.57) = 0.65
Active lever responses during TO
Session	F(4.44,75.54) = 14.79***	F(21,357) = 4.21***	F(3.73,63.46) = 1.37
Strain	F(1,17) = 1.38	F(1,17) = 4.2	F(1,17) = 21.51***
Session*Strain	F(4.44,75.54) = 0.73	F(21,357) = 3.61***	F(5,85) = 0.44
Inactive lever responses
Session	F(8,136) = 11.04***	F(21,357) = 0.54	F(5,85) = 0.72
Strain	F(1,17) = 1.45	F(1,17) = 3.46	F(1,17) = 3.58
Session*Strain	F(8,136) = 1.05	F(21,357) = 2.58***	F(5,85) = 0.20

*P < 0.05, **P < 0.01, ***P < 0.001.