Wavelike Properties of the Alpha Rhythm

Apparent similarities between brain waves and physical waves are considered. The distribution of power in the alpha rhythm over frequency and spatial wavelength is measured in several subjects. This is accomplished by means of spatial-temporal Fourier analyses of scalp surface potentials using multichannel recordings from electrodes placed along the midline. It is found that the spectrum of midline alpha oscillations peaks for long wavelengths (?20 cm). A dispersion relation relating frequency to spatial wavelength apparently exists for frequencies near the peak alpha frequency. That is, in all 13 records, frequency components just above the peak alpha frequency have shorter midline wavelengths than low alpha frequency components. The relationship of these results to theoretical descriptions of the EEG and to other experiments is discussed.

[1]  W. F. Santelmann,et al.  Traveling Waves in the Brain. , 1949, Science.

[2]  H. T. Chang,et al.  Dendritic potential of cortical neurons produced by direct electrical stimulation of the cerebral cortex. , 1951, Journal of neurophysiology.

[3]  R. L. Beurle.  Properties of a mass of cells capable of regenerating pulses , 1956, Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences.

[4]  W. Rall.  Electrophysiology of a dendritic neuron model. , 1962, Biophysical journal.

[5]  Willem A. Bergeijk,et al.  Analog models of neural mechanism , 1962, IRE Trans. Inf. Theory.

[6]  J. Griffith.  On the stability of brain-like structures. , 1963, Biophysical journal.

[7]  W. Freeman,et al.  THE ELECTRICAL ACTIVITY OF A PRIMARY SENSORY CORTEX: ANALYSIS OF EEG WAVES. , 1963, International review of neurobiology.

[8]  W. Freeman,et al.  USE OF DIGITAL ADAPTIVE FILTERS FOR MEASURING PREPYRIFORM EVOKED POTENTIALS FROM CATS. , 1964, Experimental neurology.

[9]  W. Freeman,et al.  A LINEAR DISTRIBUTED FEEDBACK MODEL FOR PREPYRIFORM CORTEX. , 1964, Experimental neurology.

[10]  L. H. Van Der Tweel,et al.  HUMAN VISUAL RESPONSES TO SINUSOIDALLY MODULATED LIGHT. , 1965, Electroencephalography and clinical neurophysiology.

[11]  G. Shepherd,et al.  Theoretical reconstruction of field potentials and dendrodendritic synaptic interactions in olfactory bulb. , 1968, Journal of neurophysiology.

[12]  D. Humphrey.  Re-analysis of the antidromic cortical response. I. Potentials evoked by stimulation of the isolated pyramidal tract. , 1968, Electroencephalography and clinical neurophysiology.

[13]  A. Rémond,et al.  The alpha average. I. Methodology and description. , 1969, Electroencephalography and clinical neurophysiology.

[14]  R. T. Lacoss,et al.  ESTIMATION OF SEISMIC NOISE STRUCTURE USING ARRAYS , 1969 .

[15]  Bogdanov KIu,et al.  Mathematical model of an evoked potential , 1969 .

[16]  Physical bases of fast and slow electric oscillations registered in the cerebral cortex , 1969 .

[17]  J. Capon.  High-resolution frequency-wavenumber spectrum analysis , 1969 .

[18]  D. Lehmann.  Multichannel topography of human alpha EEG fields. , 1971, Electroencephalography and clinical neurophysiology.

[19]  P. Núñez.  Longitudinal Wave Propagation in a Plasma Containing an External Time‐Dependent Electric Field , 1971 .

[20]  R. Elul.  The genesis of the EEG. , 1971, International review of neurobiology.

[21]  W J Freeman,et al.  Linear analysis of the dynamics of neural masses. , 1972, Annual review of biophysics and bioengineering.

[22]  Hellmuth Petsche,et al.  Synchronization of EEG Activity in Epilepsies , 1972, Springer Vienna.

[23]  J R Bourne,et al.  Spatio-temporal measures of cortical functioning in normal and abnormal vision. , 1972, Computers and biomedical research, an international journal.

[24]  J. Cowan,et al.  Excitatory and inhibitory interactions in localized populations of model neurons. , 1972, Biophysical journal.

[25]  P. Nunez.  Representation of evoked potentials by Fourier-Bessel expansions. , 1973, IEEE transactions on bio-medical engineering.

[26]  P. Nunez.  The brain wave equation: a model for the EEG , 1974 .