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Ellipsoidal Harmonics by George Dassios

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15Applications to bioscience

15.1 Electromagnetic activity of the brain

The electromagnetic activity of the human brain is governed by the quasi-static theory of Maxwell’s equations [229, 284] which, to some extent, decouples the electric from the magnetic behavior. The brain is modelled as a conductive medium with certain conductivity and a magnetic permeability which is equal to the permeability of the air. The brain is surrounded first by the cerebrospinal fluid, then by the skull, and finally by the scalp, all having different conductivities but the same magnetic permeability. In most cases though the brain–head system is assumed to be a single homogeneous medium. A primary neuronal current within the conductive brain tissue excites a secondary ...

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