The changes of EEG power: Delta (1–4 Hz), Theta (4–8 Hz), Alpha (8–12 Hz), Bata (12–25 Hz) and Gamma band(25–100 Hz) as well as Spindle wave(7–14 Hz) in S1BF and S2 when the rats were infused with propofol infused at 20, 40 and 80 mg/kg/h.

<p>A) EEG power in S1BF at different dosage of propofol and no difference among the three groups(infusion rates); B) EEG power in S2 at different dosages of propofol and no difference among the three groups except the delta power in propofol 80 mg/kg/h was stronger than that in propofol 20 mg/kg/h; C) The change of theta power under different dosages of propofol. The power of θ wave in S2 was larger than that in S1BF In any group A,B and C *p<0.05.