Patent ID: 8600493

Claim:
A method for monitoring seizure activity in brain, the method comprising: deriving a first parameter set sequence in a parameter determination unit from brain wave signal data obtained from a subject, wherein the first parameter set sequence comprises sequential parameter sets and each parameter set comprises values for at least two signal parameters, the values being derived from the brain wave signal data; determining an envelope object in an envelope unit from the first parameter set sequence in a parameter space defined by the at least two signal parameters, wherein the envelope object encompasses the first parameter set sequence in the parameter space; determining a reference point, wherein location of the reference point in the parameter space depends on the first parameter set sequence; obtaining a second parameter set sequence in the parameter determination unit from the brain wave signal data, wherein the second parameter set sequence comprises at least one parameter set subsequent to the sequential parameter sets of the first parameter set sequence; determining an evolution indicator set in an evolution indicator unit that is indicative of (a) location of the second parameter set sequence in relation to the envelope object and (b) direction of the second parameter set sequence in relation to the reference point; conditionally updating the envelope object and the reference point based on (i) sequential parameter sets of the first parameter set sequence and (ii) the second parameter set sequence, wherein the conditionally updating comprises performing the updating if the evolution indicator set fails to fulfill predetermined location and direction criteria indicative of seizure activity and skipping the updating if the evolution indicator set fulfills the predetermined location and direction criteria; and indicating whether the evolution indicator set fulfills the predetermined location and direction criteria, thereby to produce an indication of seizure activity in the brain wave signal data.