“…Interpretation of LFP measures rests on well established biophysical findings and models and depends upon the size, geometry, and laminar structure of the neuronal generators (Nicholson, 1973;Mitzdorf, 1985;Schroeder et al, 1995Schroeder et al, , 1998Logothetis, 2003;Pettersen et al, 2006). Considering our recording configurations and the well established directional specificity of the LFP in laminated cortical structures, we assume that a prominent contribution to the recorded LFPs comes from excitatory and inhibitory synaptic potentials, mostly from pyramidal neurons (Klee et al, 1965;Creutzfeldt et al, 1966a,b), but perhaps also from stellate cells (Murakami and Okada, 2006) and from afterdischarges not directly related to cellular activity (Granit et al, 1963;Mitzdorf, 1987;Kamondi et al, 1998;Juergens et al, 1999).…”