Local Field Potential, Relationship to Unit Activity
نویسندگان
چکیده
Unit activity usually refers to timing of spikes elicited by individual neurons (single-unit activity, SUA) or local (r < 140 mm) population of neurons (multiunit activity, MUA; Buzsáki 2004). Although local field potential (LFP) reflects both subthreshold and spiking activities that are summed over larger population of neurons (r < 450 mm; Berens et al. 2008), usually it does not display discriminable spikes. Nevertheless, the amplitude of high-frequency LFP (>40 Hz) often correlates with population firing rate, whereas the phase and amplitude of low-frequency LFP (<10 Hz) modulate this relationship. The LFP–spike relation is very sensitive to neuronal correlations – at high synchrony levels, neurons produce macroscopic spikes visible in the raw LFP signal (“population spikes”).
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