Simulation of electrocortical waves |
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Authors: | J J Wright D T J Liley |
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Institution: | (1) Mental Health Research Institute and Swinburne Center for Applied Neuroscience (Swinburne University of Technology), Melbourne, Australia, AU |
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Abstract: | We report simulations of the electrocorticogram of the cat and human, based on estimates of fibre range, fibre density, axonal
and dendritic delays, and cortical synaptic density. The long-range cort
ical connections of real cortex were simplified to couplings of symmetric density, decreasing in density with range, on a
closed (toroidal) surface. Non-specific cortical activation was modelled as a diffuse global input and specific sensory input
as a lo
calised white noise input. Spectral properties of output included peak densities at the frequencies of the major cerebral
rhythms, a ‘1/f ’ spectral envelope and ‘shift to the right’ with increasing total power as n
on-specific activation increased. Steady-state travelling waves with a velocity of 5–7 m/s (human) and <1 m/s (cat) were produced.
Frequency/wavenumber analysis revealed an additional class of activity with wavenumbers independent o
f temporal frequency. All these findings accord qualitatively and quantitatively with existing physiological results. Global
resonant modes were not prominent, but the simulations obey a restricted case of the analytical results of Nunez (1994). Wave/puls
e relations resemble the findings of Freeman (1975).
Received: 8 July 1994/Accepted in revised form: 15 September 1994 |
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Keywords: | |
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