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In the modern knowledge economy, success demands sustained focus and highcognitive performance. Research suggests that human cognition is linked to afinite resource, and upon its depletion, cognitive functions such asself-control and decision-making may decline. While fatigue, among otherfactors, affects human activity, how cognitive performance evolves duringextended periods of focus remains poorly understood. By analyzing performanceof a large cohort answering practice standardized test questions online, weshow that accuracy and learning decline as the test session progresses andrecover following prolonged breaks. To explain these findings, we hypothesizethat answering questions consumes some finite cognitive resources on whichperformance depends, but these resources recover during breaks between testquestions. We propose a dynamic mechanism of the consumption and recovery ofthese resources and show that it explains empirical findings and predictsperformance better than alternative hypotheses. While further controlledexperiments are needed to identify the physiological origin of these phenomena,our work highlights the potential of empirical analysis of large-scale humanbehavior data to explore cognitive behavior.

Model of Cognitive Dynamics Predicts Performance on Standardized Tests