Monitoring of the cerebral state of a subject

  • US 7,783,343 B2
  • Filed: 07/07/2005
  • Issued: 08/24/2010
  • Est. Priority Date: 07/07/2005
  • Status: Active Grant
First Claim
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1. A method for monitoring the cerebral state of a subject, the method comprising the steps of:

  • obtaining physiological signal data from a subject, the physiological signal data including EEG signal components;

    deriving, using a computer unit, a first parameter from the physiological signal data, wherein the first parameter is indicative of the relative magnitudes of a first sum of k-th order spectral values and a second sum of n-th order spectral values, wherein the second sum is calculated over a first frequency band lying above high frequency EEG activity and consisting mostly of EMG activity, and wherein k is an integer greater than two and n is an integer greater than one; and

    forming a state index which has a predetermined relationship with the first parameter derived in the deriving step, the state index being indicative of the cerebral state of the subject.

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