METHOD FOR LOCATING A BRAIN ACTIVITY ASSOCIATED WITH A TASK

摘要

The invention relates to a method for estimating the brain activity, from physiological signals, in particular magnetoencephalographic or electroencephalographic surfaces, which has, in certain predetermined areas of the cortex, considered as areas of interest, an improved accuracy with respect to other areas of the gridding. It enables a more accurate estimation to be obtained in the areas of the brain intended to be subjected to a particular treatment, for example to accommodate cortical electrodes.

主权项

1. A method for estimating the electrical activity within a tissue of a subject, wherein
the tissue is decomposed into a plurality of elementary areas and a transition matrix connecting the electrical activity in each area to a physiological signal around the tissue is determined, acquiring a plurality of physiological signals is performed thanks to a plurality of sensors disposed around the tissue, a noise covariance matrix is estimated; said method being characterised in that: elementary areas interest are defined among the elementary areas, the number of elementary areas of interest being strictly lower than the number of elementary areas, a source covariance matrix is established, so that the terms of its diagonal, corresponding to the elementary areas of interest, are lower than the other terms of its diagonal, the electrical activity in at least one elementary area is estimated from the physiological signals, the source covariance matrix and the noise covariance matrix