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Local field potentials. Representative examples of LFP power spectra from directional pairs (E1a-E2a, E1b-E2b, E1c-E2c) recorded over the study period for the four subjects implanted with directional leads. Recordings showed predominant theta activity in all nodes monitored. The dotted line denotes the free-roaming condition, and the solid line denotes the sling condition. Each line represents one 30 s sense recording for the representative study period.
