The tuning bandwidth of the auditory cortical LFP response to tones appears equivalent to that of the EPSP over intensities ranging from threshold to 70dB, covering the intensity (60dB) used in the present study (Kaur et al., 2004), and consistent with the idea that the LFP is a reflection of local synaptic events (Kaur et al., 2004;Nicholson, 1973;Nicholson and Freeman, 1975). Given this, the LFP's broader tuning relative to MUA is consistent with that of subthreshold excitatory synaptic potentials (EPSPs) relative to that of action potentials (Ojima and Murakami, 2002; Ribaupierre et al., 1972; Tan et al., 2004; Volkov and Galazjuk, 1991). Not surprisingly then, our results agree with prior ones showing that in auditory cortex, the tuning bandwidth of the LFP is generally wider than that of neuronal firing [ e.g., (Eggermont, 1998; Eggermont et al., 2011; Norena and Eggermont, 2002; Kaur et al., 2004)}.
