Use of Spatial Deconvolution to Compensate for Distortion of EEG by Volume Conduction

IEEE Transactions on Biomedical EngineeringPublished 1 August 1980

Walter Freeman

DOI10.1109/tbme.1980.326750

Source URL

Citations92

SJR quartileQ1

SJR score1.11

SNIP1.58

TL;DR

If the geometry of the EEG generators is known, the smoothing process can be described quantitatively, and the spatial patterns of underlying neural activity can be restored within limits imposed by noise and instrumental imprecision.

Abstract

EEG waves recorded with electrode arrays on the brain surface give spatial patterns of cortical neural activity that are smoothed by the volume conductor properties of brain tissue. If the geometry of the EEG generators is known, the smoothing process can be described quantitatively, and the spatial patterns of underlying neural activity can be restored within limits imposed by noise and instrumental imprecision.

Keywords

Neuroscience

Ecological studiesDigital Picture Processing

1,216 Citations1976P. Hartl

From an analysis point of view an image can be considered as a two-dimensional area of picture elements (pixels), each of which is characterized by a gray level, which are assumed to represent the radiant energy of some electromagnetic spectral range.

Electroencephalography and Clinical NeurophysiologyMultidisciplinary perspectives in event-related brain potential research

524 Citations1980John R. Hughes

Electroencephalography and Clinical NeurophysiologySpatial properties of an EEG event in the olfactory bulb and cortex

306 Citations1978Walter J. Freeman

The results fail to support the hypothesis that different odors are represented by activity in grossly different parts of the bulb, and preliminary results from bulbar evoked potentials suggest that foci may result from specialized conditions created by centrifugal input or from interactions between the bulb and more central structures.

Biological CyberneticsNonlinear gain mediating cortical stimulus-response relations

266 Citations1979Walter J. Freeman

It is concluded that large numbers of neurons in the olfactory bulb of the waking animal are maintained in a sensitive nonlinear state, that corresponds to the domain of the subthreshold local response of single axons, as it is defined by Rushton and Hodgkin.

Experimental NeurologySpecific impedance of rabbit cerebral cortex

260 Citations1963James B. Ranck

In rabbits anesthetized with urethane, cortical impedance was measured by applying nonstimulating sinusoidal currents through a 20-μ platinum electrode and showed that hemispherical symmetry was true out to 1.3 mm from the current source.

Biological CyberneticsNonlinear dynamics of paleocortex manifested in the olfactory EEG

203 Citations1979Walter J. Freeman

The model suffices to replicate the forms of the EEG burst; the pulse probability distributions conditional on the EEG; the waveforms of averaged evoked potentials and post stimulus time (PST) histograms from the bulb and cortex; and the changes in waveform induced by behavioral control of attentiveness and habituation.

Biological CyberneticsEEG analysis gives model of neuronal template-matching mechanism for sensory search with olfactory bulb

178 Citations1979Walter Freeman

It is postulated here that the spatial EEG pattern is dependent on a neural template for that odor that is formed during training, and that Vj depends on the template and is relatively insensitive to input, whether or not input is given to template elements.

IEEE Transactions on Biomedical EngineeringTheoretical Analysis of Field Potentials in Anisotropic Ensembles of Neuronal Elements

129 Citations1973Charles Nicholson

Synchronous excitation of an ensemble of elements in the nervous system generates field potentials in and around the ensemble that can provide information about neuronal function.

PubMedModels of the dynamics of neural populations.

97 Citations1978Freeman Wj

A model is presented that exemplifies the dependence of its levels of interaction on the level of its input, so that with each burst of input the model switches from an equilibrium state to a limit cycle state.

International review of neurobiologyThe Electrical Activity of A Priaaary Sensory Cortex: Analysis of Eeg Waves

53 Citations1963Walter J. Freeman

The chapter describes the electrical activity of one cortical area of the cat brain and its relation to behavior and a linear second-order equation is used to describe cortical function in terms of input, output, and waveform of spontaneous and evoked potentials.