Figure 4.
The PSD of LFPs within the frequency range analyzed (2–45 Hz) for rACC LFP signals, comparing the 1st and later stimuli. (A) Raw total PSD in the pre-stimulus periods. (B) The PSD was normalized by the percentage of total power in five frequency bands in the pre-stimulus periods. Five frequency band intervals were considered: 2–4 Hz (delta), 4–9 Hz (theta), 9–15 Hz (alpha), 15–30 Hz (beta), and 30–45 Hz (gamma). Comparisons between the 1st and later stimuli are based on one-way rmANOVA (A) and two-way rmANOVA (frequency bands × number of stimuli) (B), followed by a post hoc Bonferroni test. * P<0.001. The inspection of PSD (B) indicated a stronger delta band component was present in the last four stimulus presentations. PSD – power spectral density; LFPs – local field potentials; rmANOVA – repeated measures analysis of variance.