Method for characterizing physiological state of patient by analyzing electrical activity of patient's brain and monitoring device to which the method is applied
The invention relates to a method for detecting a physiological state of a patient deviating from a reference physiological state, in which, after having determined, in each of Q frequency bands, R reference matrices PRq,r with qe[1 . . . Q] and r&egr；[1 . . . R] which correspond to the reference physiological state, the following steps are repeated in a loop: carrying out measurements, in M time segments, of an electroencephalographic signal； filtering and centering the measurements in Q frequency bands to obtain and determine M×Q scaled matrices of spatial covariance； for each time segment m, calculating a deviation from the reference physiological state, and comparing each of the deviations from the reference physiological state to a predefined threshold. The invention also relates to a monitoring device applying said method.
