Figure 7.
Intracellular, MUA, and synaptic event signals presented a robust β/γ coherence with the LFP, despite their weak oscillatory character (Figs. 3, 4, 6). A, LFP, MUA, intracellular recordings, and extracted event train (see Fig. 5) for a 20 s window of activity for one neuron in our database, when recorded at a hyperpolarized membrane voltage (−63 mV). Vertical scale bar, 5 mV. B, Coherence and cross-correlation function of this neuron's intracellular membrane voltage recording and the LFP. C, In the population (n = 10), coherence between LFP and adjoining intracellular records was significant in the β/γ band. D, Coherence and cross-correlation function between MUA and LFPs for the data shown in A. E, In the population (n = 10), coherence between MUA and LFP was significant in the β/γ band. F, Coherence and cross-correlation function between event trains detected from the intracellular recording (Fig. 5) and simultaneous, adjoining LFP, for the neuron in A. G, Coherence between synaptic events and LFP remained significant in the population (n = 10). For this analysis, synaptic event trains recorded at different membrane voltages were analyzed conjointly (i.e., ignoring their putative excitatory or inhibitory character). In all panels, shading indicates the 95% CI of the estimate. Horizontal dashed lines mark the upper 95% CI under the hypothesis of independence.