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. 2011 Mar 16;31(11):4101–4112. doi: 10.1523/JNEUROSCI.4380-10.2011

Figure 2.

Figure 2.

Behavioral context modifies LFP. A, E, Averaged power spectra of all recording sites (n = 214 recording sites) before (0.5 s period from −0.5 to 0.0 s) (A) and after (0.5 s period from +0.3 to +0.8 s) (E) NaCl delivery. Power was lower in the beta and gamma frequency ranges in both prestimulus and poststimulus epochs of task (black lines). The three lines indicate mean and mean ± SE. B–D, F–H, Averaged power in beta (15–30 Hz) (B, F), low-gamma (40–50 Hz) (C, G), and high-gamma (70–85 Hz) (D, H) frequency ranges before (B–D) and after stimulus (F–H). In task, LFP power was significantly lower than in passive at most frequencies. B, G, p < 0.05 for main effects of context and taste by 2W-RM-ANOVA. C, H, p < 0.05 for simple main effect of context in all tastes after significant context–taste interaction. D, p < 0.05 for simple main effect of context in N (but not other tastes) after significant context–taste interaction. F, No significant difference between contexts. N, NaCl; S, sucrose; C, citric acid; Q, quinine. I, Averaged GEP in NaCl (N) trials (n = 133 recording sites) in task (black lines) and passive (gray, mean and mean ± SE). The GEP amplitude was smaller in task. J, Between-context comparison of the peak amplitudes of the GEP (filled bars, task; open bars, passive). N = 133, 127, 104, and 76 for N, S, C, and Q, respectively. Only the data containing significant peaks or valleys at least in one context (>3 times the SD of 500 ms before stimulus epoch) (also see Materials and Methods) were used. Amplitudes in task were significantly lower than those in passive for all tastes (all values of p < 0.05 by Wilcoxon's signed rank test with Bonferroni's correction). The difference between contexts was not affected by the block order in most conditions: for 8 comparisons—4 per taste × 2 possible orders—the task versus passive difference failed to reach significance in only one (Q in passive-first sessions). K, Between-context comparison of peak times of the GEP (filled bar, task; open bar, passive). N = 133, 127, 104, and 76 in N, S, C, and Q. There was no difference between contexts for any taste, nor any effect of block order. Error bars indicate SEM.