Evidence for slow (2-10 Hz) and gamma frequency coherence between spike trains and local field potentials in the cerebellum

7 A method for detecting relationships between single-unit spike trains and local %eld potentials (LFPs) was developed and applied to recordings from rat cerebellum. LFPs were repeatedly 9 %ltered with a shifting frequency window. The resulting traces were transformed into peak-time point processes for comparison with spike trains using “relative-phase” analysis (Biol. Cyber11 net., in press). Discharge of some Purkinje cells was phase-related to LFP oscillations in the 2–10 Hz and 30–50 Hz frequency ranges. This analysis method revealed hidden coherency be13 tween spike-trains and LFPs. The %ndings suggest that cerebellar activity is, to some extent, temporally organized according to both slow and fast rhythms. 15 c © 2002 Published by Elsevier Science B.V.