The invention concerns a method and system for computing a state of fatigue whilst a user carries out a task. In a first step of the method, EEG data is sampled from a user when the user is performing a task. Frequency domain analysis is then performed on the sampled data to derive the magnitude of EEG in a plurality of frequency bands. The magnitude is then simultaneously computed in each of the bands prior to comparing the magnitude in each of the bands against pre-determined standards to determine a corresponding state of fatigue.
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