Figure 3. Time-frequency spectra of LFPs while rat in a WM task.
Spectral peaks of the gamma and theta rhythms stand out as isolated spots (arrows). The gamma rhythms slow down gradually from 55.0 Hz and 75.0 Hz while theta rhythms slow down gradually from 3.0 Hz and 10.0 Hz. The time interval of LFPs was 2 s before WM reference and 1 s after WM reference. Time is presented on the x-axis. Frequency is presented on the y-axis. The width of each spectral segment was 7 s, and the frequency ranges was 1–80 Hz. (A) denote time-frequency spectra of PRO group in the first day, the second day and the next day after propofol anesthesia. (B), (C) respectively denote time-frequency spectra of control group and pro group at the same time. The energy level is coded on a color scale: blue areas show low energy, and red areas show high energy. Control = no propofol anesthesia; pro = 0.5 mg•kg−1•min−1, 2 h; PRO = 0.9 mg•kg−1•min−1, 2 h. ▾▴ represents the tripping time by infrared in Y-maze.