Fig. 5.
Oscillation frequency of phase-precessing interneurons is speed-dependent. The power spectra are calculated only for spikes and LFP during segments when the rat crosses the interneuron's place field (compare with Fig. 2B). Interneurons increase their oscillation frequency significantly more with faster running speed than the LFP [interneurons, mean (Δf) = 0.8 ± 0.7; LFP, mean(Δf) = 1.5 ± 0.9; P < 0.01]. Fields were sorted according to the speed difference between fast and slow trials (speed differences ranged from 5 to 25 cm/sec). Spectra were computed for 12 place fields of eight interneurons.