title: Single cell activity in chronic unit recording: a quantitative study of the unit amplitude spectrum.
abstract: The ratio of standard deviation to mean, of the amplitude spectrum of well resolved single units, is shown to scale exponentially. This scaling is explained on the basis of a consideration of the relationship of extracellular voltage to voltage gradient, in a dendritic neuron model. A method is then advanced to extract, from multi-unit data, normally distributed amplitude spectra which are indistinguishable from those of well resolved single units. This method is suggested as a means of characterizing, in general, the unit activity obtained from chronically implanted preparations.
mesh_terms: D000818:Animals; D002415:Cats; D003201:Computers; D004569:Electroencephalography / Q000379:methods*; D004594:Electrophysiology; D008839:Microelectrodes; D009474:Neurons / Q000502:physiology*