Table 2.

Period length of activity cycle (tau value) for measured activities during study phases. Standard deviations are indicated in parentheses.

	Unpaired Group			Paired Group
Study Phase	Wheel	Water	Food	Wheel	Water	Food
Acclimation	27.08 (2.71)	24.42 (1.03)	26.83 (2.76)	24.75 (0.69)	24.08 (1.39)	24.08 (2.57)
Acclimation Injections	24.08 (3.04)	26.83 (1.38)	26.33 (1.35)	24.50 (3.39)	25.33 (2.51)	26.08 (3.13)
Nicotine Phase1	24.00 (2.85)	24.00 (2.63)	24.00 (3.28)	24.00 (2.77)	24.00 (3.64)	24.00 (3.09)
Test 1: Circadian Effects	24.92 (2.07)	24.25 (1.42)	24.00 (3.03)	24.33 (1.01)	24.58 (1.55)	24.67 (2.30)
Nicotine Phase 2	24.00 (0.38)	24.00 (2.62)	24.00 (3.37)	24.00 (0.05)	24.00 (1.78)	24.00 (3.13)
Test 2: Stimulus Effects	24.17 (3.85)	27.25 (1.41)	24.00 (3.85)	24.50 (3.19)	24.75 (0.04)	24.75 (2.40)
Nicotine Phase 3	24.00 (0.18)	24.00 (1.90)	23.92 (1.59)	24.00 (1.62)	24.00 (1.41)	24.00 (2.21)
Test 3: Probe Test	24.17 (3.57)	24.08 (2.83)	24.42 (4.16)	24.08 (3.26)	25.42 (0.95)	24.33 (3.70)
Final Baseline	24.00 (1.39)	28.92 (2.29)	25.00 (1.96)	27.17 (2.41)	26.83 (1.54)	24.08 (1.31)