Abstract
Human alertness varies very quickly in time domain affecting tasks requiring sustained vigilance. This can have huge consequences in various occupations that require a very high level of attention. Changes in the level of alertness are correlated with fluctuations in the electroencephalographic signal's power spectral density. This can be revealed with fast Fourier transform (FFT) of an EEG signal obtained with a single channel electroencephalograph connected to a data acquisition system (DAQ). In real life, the bioelectric signals can be acquired by masked electrodes placed, for example, in protective helmets or in eye glasses, depending on the operator's job description. In attention-critical environment, the operators can be monitored for evaluating their cognitive mental state.
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