Influence of spreading neuronal electric sources on spatio-temporal neuromagnetic fields

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Abstract
This study focuses on the influences of spreading multiple dipoles in the human head upon surface magnetic fields. A source model of the magnetoencephalogram (MEG) activity is proposed. This source model is expressed by spreading multiple dipoles which have time-varying dipole moments. Using this source model, spatio-temporal patterns of MEGs are simulated. Effects of spreading dipoles on spatio-temporal magnetic fields are investigated. The computer simulations show that the wave forms and amplitude of magnetic fields are affected significantly by the spread of the source and the conduction velocity of traveling dipoles. The latency of the peak magnetic field generated by spreading multiple dipoles varies with the measurements points on the surface of the head.