When you are working at your daytime job, using a computer, your human biological systems require that you deal with the development of three kinds of cognitive (mental) fatigue: acute, cumulative and task-specific. Performetric monitors the combined, additive effects of these three types of cognitive fatigue. Acute cognitive fatigue builds up normally and unavoidably within one waking period of about 16 hours. It is happening to you as you read this post. Recovery from acute fatigue occurs as the result of one good-quality, nighttime sleep period of about eight hours. Cumulative cognitive fatigue builds up across major waking periods when...

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