Coherence between mPFC and amygdala is increased at theta frequency in allergen-exposured rats. (A) Spectral coherence between simultaneously recorded mPFC and amygdala LFPs. Shaded area indicates standard errors. The gray area indicates significant differences between OVA and control rats. Inserted panel shows significant differences between OVA and control rats at 6.5–7 Hz frequencies. (B) Mean mPFC-amygdala coherence at delta (<4 Hz, left) and theta (4–12 Hz, right) frequencies. The horizontal bars represent mean values. Data were analyzed by t-test, n = 8 per group. *p < 0.05 compared to control. OVA, ovalbumin; mPFC, medical prefrontal cortex; LFP, local field potential.