Summary of directional unit phase-locking analysis.

Each identified unit (CA1, LA, IL-PFC) was assigned a theta phase of LFPs recorded in the same and the other two brain areas (unit CA1 - LFP CA1, LA and IL-PFC, unit LA - LFP LA, CA1 and IL-PFC, unit IL-PFC – LFP IL-PFC, CA1 and LA), and lag or lead of the respective unit was determined by the peak MRL value. N [unit/animal] describes the total number of identified phase-locked units and the number of animals in which these units were identified. Results obtained at freezing during retrieval of fear memory (R1), and non-freezing during recall of fear extinction (E). A negative mean [ms] describes a preceding (lead) of the unit, phase-locked to the respective LFP, a positive mean circumscribes the opposite (lag). The p value determines the significance of directionality during R1 and E by use of paired Wilcoxon’s signed rank non-parametric test.