a,b,c,d - Interaction plots for alpha band for encoding, retrieval and baseline/free navigation conditions at nine ROIs: a) Graph comparing encoding and baseline for alpha band, shows a significant increase in all the nine brain ROI during baseline as compared to encoding; b) Graph comparing encoding and retrieval for alpha band, shows a significant increase in left central, right parietal, left occipital and right occipital brain ROI during retrieval as compared to encoding; c) Graph comparing retrieval and free navigation for alpha band, shows an increase in all the nine brain ROI during free navigation as compared to retrieval, reaching significance level at left parietal, right parietal, right occipital and frontal central ROI; (d) graph comparing free navigation and baseline indicating no significant differences between these conditions; *-significance level, p < .001.